



Internet Engineering Task Force (IETF)                      P. Hunt, Ed.
Request for Comments: 9967                                Independent Id
Updates: 7643, 7644                                        N. Cam-Winget
Category: Standards Track                                  Cisco Systems
ISSN: 2070-1721                                                 M. Kiser
                                                               Sailpoint
                                                            J. Schreiber
                                                                 Workday
                                                                May 2026


System for Cross-Domain Identity Management (SCIM) Profile for Security
                          Event Tokens (SETs)

Abstract

   This specification defines a set of System for Cross-domain Identity
   Management (SCIM) Security Events using the Security Event Token
   (SET) specification (RFC 8417) to enable the asynchronous exchange of
   messages between SCIM service providers and receivers.

   This specification updates RFC 7643 by defining additional attributes
   for the "urn:ietf:params:scim:schemas:core:2.0:ServiceProviderConfig"
   schema, and it updates RFC 7644 with an optional new asynchronous
   SCIM request capability.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc9967.

Copyright Notice

   Copyright (c) 2026 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Revised BSD License text as described in Section 4.e of the
   Trust Legal Provisions and are provided without warranty as described
   in the Revised BSD License.

Table of Contents

   1.  Introduction and Overview
     1.1.  Requirements Language
     1.2.  Notational Conventions
     1.3.  Definitions
   2.  SCIM Events
     2.1.  Identifying the Subject of an Event
     2.2.  Common Event Attributes
     2.3.  SCIM Feed Events
       2.3.1.  urn:ietf:params:scim:event:feed:add
       2.3.2.  urn:ietf:params:scim:event:feed:remove
     2.4.  SCIM Provisioning Events
       2.4.1.  urn:ietf:params:scim:event:prov:create:{notice|full}
       2.4.2.  urn:ietf:params:scim:event:prov:patch:{notice|full}
       2.4.3.  urn:ietf:params:scim:event:prov:put:{notice|full}
       2.4.4.  urn:ietf:params:scim:event:prov:delete
       2.4.5.  urn:ietf:params:scim:event:prov:activate
       2.4.6.  urn:ietf:params:scim:event:prov:deactivate
     2.5.  Miscellaneous Events
       2.5.1.  Asynchronous Events
   3.  Set-Txn HTTP Response Header for Asynchronous Requests
   4.  Events Discovery Schema for Service Provider Configuration
   5.  Security Considerations
   6.  Privacy Considerations
   7.  IANA Considerations
     7.1.  SCIM Asynchronous Set-Txn Header Registration
     7.2.  Registering Event Capability with SCIM Service Provider
           Configuration
     7.3.  Creation of the SCIM Event URIs Registry
     7.4.  Initial Contents of the SCIM Event URIs Registry
   8.  References
     8.1.  Normative References
     8.2.  Informative References
   Appendix A.  Use Cases
     A.1.  Domain-Based Replication
     A.2.  Coordinated Provisioning
   Acknowledgements
   Authors' Addresses

1.  Introduction and Overview

   This specification defines Security Events for SCIM service providers
   and receivers as specified by Security Event Tokens (SETs) [RFC8417].
   In this specification, SCIM Security Events include asynchronous
   request completion, resource replication, and provisioning
   coordination.

   This specification defines the use of the HTTP header "Prefer:
   respond-async" [RFC7240] to allow a SCIM client [RFC7644] to request
   an asynchronous response (see Section 2.5.1.1).

   Using the HTTP protocol, a SCIM client issues commands to a SCIM
   service provider using HTTP methods such as POST, PATCH, and DELETE
   [RFC7644] that cause a state change to a SCIM resource.  When
   multiple independent SCIM clients update SCIM resources, individual
   clients become out of date as state changes occur.  Some clients may
   need to be informed of these changes for coordination or
   reconciliation purposes.  This could be done using periodic SCIM GET
   requests over time, but this rapidly becomes problematic as the
   number of changes and the number of resources increases.

   SCIM Events can be shared over an established event feed enabling
   receivers to monitor and trigger independent asynchronous action.
   This approach enables greater scale and timeliness, where only
   changed information is exchanged between parties.

   A SET conveys information about a state change that has occurred at a
   SCIM service provider.  That SET may be of interest to one or more
   receivers.  But instead of interpreting SETs as commands, each Event
   Receiver is able to determine the best local follow-up action to take
   within its own context.  For example, a receiver can reconcile schema
   and resource type differences between domains.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

1.2.  Notational Conventions

   Throughout this document, all figures may contain spaces and extra
   line wrapping for readability and space limitations.  Similarly, some
   URIs contained within examples have been shortened for space and
   readability reasons.

1.3.  Definitions

   This specification uses definitions from the following
   specifications:

   *  "JSON Web Token (JWT)" [RFC7519],

   *  "Security Event Token (SET)" [RFC8417], and

   *  "System for Cross-domain Identity Management: Protocol" [RFC7644].

   In JSON Web Tokens (JWTs) and Security Event Tokens, the term "claim"
   refers to JSON attribute values contained in a JWT [RFC7519]
   structure.  The term "claim" in tokens is used to indicate that an
   attribute value may not be verified and its accuracy can be
   questioned.  In the context of SCIM, this distinction is not made.
   For this specification, the terms "claims" and "attributes" are
   interchangeable.  For consistency, JWT and SET attributes registered
   by IANA will continue to be called "claims", while event information
   attributes (i.e., those in an event payload) will be referred to as
   "attributes".

   Additionally, the following terms are defined:

   Attributes and Claims:
      The JWT specification [RFC7519], upon which SET is based, uses the
      term "claims" to refer to attributes in a JSON Web Token.  In
      contrast, SCIM uses the term "attributes" to refer to JSON
      attributes.  For the purposes of this document, the terms
      "attributes" and "claims" are equivalent.

   Coordinated Provisioning (CP):
      As defined in Appendix A.2, in CP relationships, an Event
      Publisher and Receiver typically exchange resource change events
      without exchanging data (see Section 2.4).  For a receiver to know
      the value of the data, the Event Receiver usually calls back to
      the SCIM Event Publisher domain to receive a new copy of data
      (e.g., uses a SCIM GET request).

   Domain-Based Replication (DBR):
      As defined in Appendix A.1, in the DBR mode, there is an
      administrative relationship spanning multiple operational domains;
      data shared in Events typically uses the "full" mode variation of
      change events (see Section 2.4) including the "data" payload
      attribute.  This eliminates the need for a callback to retrieve
      additional data.

   Event Feed / Event Stream:
      An event feed (or equivalently an event stream) is a logical
      series of events shared with a unique receiving client.  A SET
      transfer (see [RFC8935] and [RFC8936]) service provider may offer
      to allow Event Receivers to "subscribe" to specific event types or
      events about specific resources (see feed events in Section 2.3).

   Event Receiver:
      An entity typically receives events as described in [RFC8935] and
      [RFC8936] or via HTTP GET (see Section 2.5.1.1).  In the case of
      push-based SET delivery [RFC8935], the Event Receiver is an HTTP
      endpoint that receives requests.  In the case of poll-based SET
      delivery [RFC8936], the receiver is an HTTP client that initiates
      HTTP requests to an Event Publisher endpoint.

   Event Publisher:
      A system that issues SETs based on a resource state change that
      has occurred at a SCIM service provider.  For example, events may
      be the result of a SCIM Create, Modify, or Delete operation as
      defined in Section 3 of [RFC7644].  A SCIM service provider may be
      an Event Publisher or an independent service that aggregates
      events into Event Receiver feeds.  As described above, when using
      [RFC8935], the Event Publisher is an HTTP client that initiates
      HTTP POST requests to a defined Event Receiver endpoint.  When
      using [RFC8936], the Event Publisher provides an HTTP endpoint,
      which a receiver may use to "poll" for Security Events.

   SCIM Client:
      An HTTP client that initiates SCIM protocol [RFC7644] requests and
      receives responses that may cause SCIM Events to be issued by the
      SCIM service provider.  A SCIM client may also be an Event
      Receiver, typically when making an asynchronous SCIM request (see
      Section 2.5.1.1).

   SCIM Service Provider:
      An HTTP server that implements the SCIM protocol [RFC7644] and
      SCIM schema [RFC7643].  Upon processing a state change to a SCIM
      resource, it issues a SCIM Event or causes an Event Publisher to
      issue a SCIM Event.

   Security Event Token (SET):
      As defined in [RFC8417].

2.  SCIM Events

   A SCIM Event is a signal, in the form of a Security Event Token
   [RFC8417], that describes some event that has occurred.  A SET event
   consists of a set of standard JWT "top-level" claims and an "events"
   claim that contains one or more event URI subclaims (JSON attributes)
   each with a JSON object containing relevant event information.

   This specification defines the new URI prefix
   "urn:ietf:params:scim:event", which is used as the prefix for the
   defined SCIM Events (see Section 7.3).  Events are grouped into one
   of two sub-namespaces: "feed" (feed control notices) or "prov"
   (provisioning).

2.1.  Identifying the Subject of an Event

   SCIM Events MUST use the "sub_id" claim, defined by [RFC9493], to
   identify the subject of events.  The "sub_id" claim MUST be contained
   within the main JWT claims body and MUST NOT be located within an
   event payload within the "events" claim.  A SET with multiple event
   URIs indicates that the events arise from the same transaction or
   resource state change for a single resource or subject.

   The JWT "sub" claim MUST NOT be used to identify subjects to prevent
   confusion with JWT authorization tokens (originally recommended in
   Section 3 of [RFC8417]).

   {
        "iss": "issuer.example.com",
        "iat": 1508184845,
        "aud": "aud.example.com",
        "sub_id": {
           "format": "scim",
           "uri": "/Users/2b2f880af6674ac284bae9381673d462",
           "externalId": "alice@example.com"
        },
        "events": {
          ...
        }
   }

                     Figure 1: Example SCIM Subject Id

   Instead of "sub", the top-level claim "sub_id" SHALL be used.
   "sub_id" contains the subclaim attribute "format" set to "scim" to
   indicate that the attributes present in the "sub_id" object are SCIM
   attributes.  The following "sub_id" attributes are defined:

   uri:
      The SCIM relative path for the resource that usually consists of
      the resource type endpoint plus the resource "id" (see Section 3.2
      of [RFC7644]), for example,
      "/Users/2b2f880af6674ac284bae9381673d462".  This attribute MUST be
      provided in a SCIM Event "sub_id" claim.  Note that the relative
      path is the path component after the SCIM service provider Base
      URI as defined in Section 1.3 of [RFC7644].  In cases where the
      Event Receiver is unable to match a URI, the Event Receiver MAY
      issue a callback to a previously agreed SCIM service provider Base
      URI plus the relative "uri" value and perform a SCIM GET request
      per Section 3.4.1 of [RFC7644].

   externalId:
      If known, the "externalId" value (defined in Section 3.1 of
      [RFC7643]) of the SCIM resource that MAY be used by a receiver to
      identify the corresponding resource in the Event Receiver's
      domain.

   id:
      The SCIM "id" attribute (defined in Section 3.1 of [RFC7643]) MAY
      be used for backwards compatibility reasons in addition to the
      "uri" claim.

   In cases where SCIM identifiers ("id" and "externalId") are not
   enough to identify a common resource between an Event Publisher and
   Event Receiver, the "sub_id" object MAY contain attributes whose SCIM
   attribute types have "uniqueness" set to "server" or "global" as per
   Section 7 of [RFC7643].  For example, attributes such as "emails" or
   "userName" (defined in Section 4 of [RFC7643]) are unique within a
   SCIM service provider.  Such attributes should allow an Event
   Publisher and Event Receiver to identify a commonly understood
   subject resource of an event.

2.2.  Common Event Attributes

   The following attributes are available for all events defined.  Some
   attributes are defined as SET/JWT claims, while others are "event
   payload" claims as defined in Section 1.2 of [RFC8417].  Only one of
   the claims, "data" or "attributes", MUST be provided depending on the
   event definition.

   txn:
      A SET-defined claim with a STRING value (see Section 2.2 of
      [RFC8417]) that uniquely identifies a transaction originating at a
      SCIM service provider and/or its underlying data repository or
      database where one or more SCIM Events may be subsequently issued.
      In contrast to a "jti" claim (see Section 4.1.7 of [RFC7519]),
      which uniquely identifies a token, the "txn" remains the same when
      one or more SETs are generated for various purposes such as
      retransmission, publication to multiple receivers, etc.  A
      distinct state change or transaction within a SCIM service
      provider MAY result in multiple SETs issued each with distinct
      "jit" values and a common "txn" value. "txn" is REQUIRED to
      support asynchronous SCIM requests, CP, and replication to
      disambiguate or detect duplicate SETs regarding the same
      underlying transaction.

   version:
      The ETag version of the resource as a result of the event.
      Corresponds to the ETag response header described in Section 3.14
      of [RFC7644].

   data:
      An event payload attribute that contains information described in
      the SCIM Bulk Operations "data" attribute in Section 3.7 of
      [RFC7644].  The JSON object contains the equivalent SCIM command
      processed by the SCIM service provider.  For example, after
      processing a SCIM Create operation, the data contained includes
      the final representation of the entity created by the SCIM service
      provider including the assigned "id" value.

   attributes:
      A payload that contains an array of attributes that were added,
      revised, or removed.  Names of modified attributes SHOULD conform
      to the ABNF syntax rule for "path" (Section 3.5.2 of [RFC7644]).
      For example: "attributes":
      ["userName","emails","name.familyName"].

2.3.  SCIM Feed Events

   This section defines events related to changes in the content of an
   event feed such as SCIM resources that are being added or removed
   from an event feed or events used in Coordinated Provisioning
   scenarios where only a subset of entities are shared across an event
   feed.  The URI prefix for these events is
   "urn:ietf:params:scim:event:feed".

2.3.1.  urn:ietf:params:scim:event:feed:add

   The specified resource has been added to the event feed.  A
   "feed:add" does not indicate that a resource is new or has been
   recently created.  For example, an existing user has had a new role
   (e.g., CRM_User) added to their profile, which has caused their
   resource to join a feed.

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "txn": "b7b953f11cc6489bbfb87834747cc4c1",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2b2f880af6674ac284bae9381673d462",
       "externalId": "jdoe"
     },
     "events":{
       "urn:ietf:params:scim:event:feed:add": {}
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                   Figure 2: Example SCIM Feed Add Event

2.3.2.  urn:ietf:params:scim:event:feed:remove

   The specified resource has been removed from the feed.  Removal does
   not indicate that the resource was deleted or otherwise deactivated.

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2b2f880af6674ac284bae9381673d462",
       "externalId": "jdoe",
     },
     "events":{
       "urn:ietf:params:scim:event:feed:remove": {}
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                  Figure 3: Example SCIM Feed Remove Event

2.4.  SCIM Provisioning Events

   This section defines resource changes that have occurred within a
   SCIM service provider.  These events are used in both Domain-Based
   Replication (DBR) and Coordinated Provisioning (CP) mode.  The URI
   prefix for these events is "urn:ietf:params:scim:event:prov".

   When the "data" payload attribute is included for each of the
   following events, the event URI MUST end with "full"; otherwise, the
   event URI ends with "notice".  In "full" mode, the set of values
   reflecting the final representation of the resource (such as would be
   returned in a SCIM protocol response) at the service provider are
   provided using the "data" attribute (see Figure 4).  In "notice"
   mode, the "attributes" attribute is returned and lists the set of
   attributes created or modified in the request (see Figure 5).
   Exactly one of the payload attributes, "data" or "attributes", MUST
   be present.  Both MUST NOT be present simultaneously.

2.4.1.  urn:ietf:params:scim:event:prov:create:{notice|full}

   The specified resource indicates that a new SCIM resource has been
   created by the SCIM service provider and has been added to the event
   feed.  Note that because the event may be used for replication, the
   "id" attribute that was assigned by the SCIM service provider is
   shared so that all replicas in the domain MAY use the same resource
   identifier.

   {
     "jti": "4d3559ec67504aaba65d40b0363faad8",
     "iat": 1458496404,
     "iss":"https://scim.example.com",
     "aud":[
       "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754",
       "https://scim.example.com/Feeds/5d7604516b1d08641d7676ee7"
     ],
     "sub_id": {
       "format": "scim",
       "uri": "/Users/44f6142df96bd6ab61e7521d9",
        "externalId":"jdoe"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:create:full":{
         "data":{
           "schemas":[ "urn:ietf:params:scim:schemas:core:2.0:User"],
           "emails":[
             {"type":"work","value":"jdoe@example.com"}
           ],
           "userName":"jdoe",
           "name":{
             "givenName":"John",
             "familyName":"Doe"
           }
         }
       }
     }
   }

                 Figure 4: Example SCIM Create Event (Full)

   {
     "jti": "4d3559ec67504aaba65d40b0363faad8",
     "iat": 1458496404,
     "iss":"https://scim.example.com",
     "aud":[
       "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754",
       "https://scim.example.com/Feeds/5d7604516b1d08641d7676ee7"
     ],
     "sub_id": {
       "format": "scim",
       "uri": "/Users/44f6142df96bd6ab61e7521d9",
       "externalId": "jdoe"
     },
     "events": {
       "urn:ietf:params:scim:event:prov:create:notice": {
         "attributes": [
           "id",
           "name",
           "userName",
           "password",
           "emails"
         ]
       }
     }
   }

                Figure 5: Example SCIM Create Event (Notice)

   The event shown in Figure 5 notifies the Event Receiver of which
   attributes have changed, but it does not convey the actual
   information.  The Event Receiver MAY retrieve that information by
   performing a SCIM GET based on the "sub_id" value provided.

2.4.2.  urn:ietf:params:scim:event:prov:patch:{notice|full}

   The specified resource has been updated using SCIM PATCH.  In "full"
   mode, the "data" payload attribute is included (see Figure 6).  When
   the event URI ends with "notice", the list of modified attributes is
   provided (see Figure 7).

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Groups/176f397ec4c44b94b2cfcb759780b8c2",
       "externalId": "crmUsers"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:patch:full": {
         "version": "a330bc54f0671c9",
         "data": {
           "schemas":
         ["urn:ietf:params:scim:api:messages:2.0:PatchOp"],
           "Operations":[{
             "op":"add",
             "path":"members",
             "value":[{
                "display": "Babs Jensen",
                "$ref": "/Users/2819c223...413861904646",
                "value": "2819c223-7f76-453a-919d-413861904646"
             }]
           }]
         }
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                 Figure 6: Example SCIM Patch Event (Full)

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Groups/176f397ec4c44b94b2cfcb759780b8c2",
       "externalId": "crmUsers"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:patch:notice": {
         "attributes": ["members"],
         "version": "a330bc54f0671c9"
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                Figure 7: Example SCIM Patch Event (Notice)

2.4.3.  urn:ietf:params:scim:event:prov:put:{notice|full}

   The specified resource has been updated (e.g., one or more attributes
   has changed).  In "full" mode, the SCIM PUT request body is included
   in the "data" attribute (see Figure 8).  In "notice" mode, the
   modified attributes are listed using "attributes" (see Figure 9).

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2819c223-7f76-453a-919d-413861904646"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:put:full": {
         "version": "a330bc54f0671c9",
         "data": {
           "schemas":["urn:ietf:params:scim:schemas:core:2.0:User"],
           "userName":"jdoe",
           "externalId":"jdoe",
           "name":{
              "formatted":"Mr. Jon Jack Doe III",
              "familyName":"Doe",
              "givenName":"Jon",
              "middleName":"Jack"
           },
           "roles":[],
           "emails":[
             {"value":"jdoe@example.com"},
             {"value":"anon@jdoe.org"}
           ]
         }
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                  Figure 8: Example SCIM Put Event (Full)

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2819c223-7f76-453a-919d-413861904646"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:put:notice": {
         "version": "a330bc54f0671c9",
         "attributes": ["userName","externalId","name","roles","emails"]
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                 Figure 9: Example SCIM Put Event (Notice)

2.4.4.  urn:ietf:params:scim:event:prov:delete

   The specified resource has been deleted from the SCIM service
   provider.  The resource is also removed from the feed.  When a DELETE
   is sent, a corresponding "feedRemove" SHALL NOT be issued.  A delete
   event has no payload attributes.  Note that because the delete event
   has no attributes, the qualifiers "full" and "notice" SHALL NOT be
   used.

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2b2f880af6674ac284bae9381673d462",
       "externalId": "jDoe"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:delete": {}
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                    Figure 10: Example SCIM Delete Event

2.4.5.  urn:ietf:params:scim:event:prov:activate

   The specified resource (e.g., User) has been "activated".  This does
   not necessarily reflect any particular state change at the SCIM
   service provider but may simply indicate that the account defined by
   the SCIM resource is ready for use as agreed upon by the Event
   Publisher and Event Receiver.  For example, an activated resource can
   represent an account that may be logged in.

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2b2f880af6674ac284bae9381673d462"
     },
     "events":{
       "urn:ietf:params:scim:event:prov:activate": {}
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

                   Figure 11: Example SCIM Activate Event

2.4.6.  urn:ietf:params:scim:event:prov:deactivate

   The specified resource (e.g., User) has been deactivated and
   disabled.  The exact meaning SHOULD be agreed to by the Event
   Publisher and its corresponding Event Receiver.  Typically, this
   means the subject may no longer have an active security session.

2.5.  Miscellaneous Events

   This section defines related miscellaneous events such as
   asynchronous request completion that has occurred within a SCIM
   service provider.  The URI prefix for these events is
   "urn:ietf:params:scim:event:misc".

2.5.1.  Asynchronous Events

2.5.1.1.  Making an Asynchronous SCIM Request

   A SCIM client making SCIM HTTP requests defined in Section 3 of
   [RFC7644] MAY request asynchronous processing using the "Prefer" HTTP
   header as defined in Section 4.1 of [RFC7240].  The client may do
   this for a number of reasons such as avoiding holding HTTP
   connections open during long requests because the result of the
   request is not needed or the result is delivered to another entity
   for further action for coordination reasons.

   To initiate an asynchronous SCIM request, a normal SCIM protocol
   POST, PUT, PATCH, or DELETE request is performed with the HTTP
   "Prefer" header set to "respond-async" (Section 4.1 of [RFC7240]).
   The HTTP "Accept" header MUST be ignored for purposes of an
   asynchronous response.  Additionally, per Section 4.3 of [RFC7240],
   the "wait" preference SHOULD be supported to establish a maximum time
   before a SCIM service provider MAY choose to respond asynchronously.

   In response, the SCIM service provider returns either a normal SCIM
   response or HTTP status code 202 (Accepted).  The asynchronous
   response MUST contain no response body.  To enable correlation of the
   future event, the HTTP response header "Set-Txn" (see Section 3) is
   returned with a value that MUST match the "txn" claim in a subsequent
   Security Event Token.  Per [RFC7240], Section 3, the response will
   also include the "Preference-Applied" header.  The "Location" header
   value MUST be one of the following: (a) a URI where the completion
   SCIM Event Token MAY be retrieved using HTTP GET or (b) the normal
   SCIM location header response specified by [RFC7644].

   In the following non-normative example, a "Prefer" header is set to
   "respond-async":

   PUT /Users/2819c223-7f76-453a-919d-413861904646
   Host: scim.example.com
   Prefer: respond-async
   Content-Type: application/scim+json
   Authorization: Bearer h480djs93hd8

   {
     "schemas":["urn:ietf:params:scim:schemas:core:2.0:User"],
     "id":"2819c223-7f76-453a-919d-413861904646",
     "userName":"bjensen",
     "externalId":"bjensen",
     "name":{
       "formatted":"Ms. Barbara J Jensen III"
     },
     "roles":[],
     "emails":[
       {
           "value":"bjensen@example.com"
       }
     ]
   }

           Figure 12: Example Asynchronous SCIM Protocol Request

   The SCIM service provider responds with HTTP status code 202
   (Accepted) and includes the Set-Txn header:

   HTTP/1.1 202 Accepted
   Set-Txn: 734f0614e3274f288f93ac74119dcf78
   Preference-Applied: respond-async
   Location:
     "/Users/2819c223-7f76-453a-919d-413861904646"

              Figure 13: Async SCIM Request with Prefer Header

2.5.1.2.  Asynchronous Bulk Endpoint Requests

   Section 3.7 of [RFC7644] provides the ability to submit multiple SCIM
   operations in a single "bulk" request.  When an asynchronous response
   is requested, a single Asynchronous Request Completion Event MUST be
   generated for each requested operation.  For example, if a single
   "bulk" request had 10 operations, then 10 Asynchronous Event
   completion events would be generated.

   The "txn" claim MUST be set to the value originally returned to the
   requesting SCIM client (see Section 2.5.1.1) appended with a colon
   ":" and the zero-based array index of the operation expressed in the
   "Operations" attribute of the original bulk request.  The "bulkId"
   parameter MUST NOT be used for this purpose as it is a temporary
   identifier and is not required for every operation.

   For example, if a SCIM service provider received a bulk request with
   two or more operations, and had a "txn" claim value of
   "2d80e537a3f64622b0347b641ebc8f44", then the first Asynchronous
   Response Event Token representing the first operation has a "txn"
   claim value of "2d80e537a3f64622b0347b641ebc8f44:0", the second
   operation has a value of "2d80e537a3f64622b0347b641ebc8f44:1", and so
   on.

   If a SCIM service provider optimizes the sequence of operations (per
   Section 3.7 of [RFC7644]), the Asynchronous Request Completion Events
   MAY be generated out of sequence from the original request.  In this
   case, the "txn" claims in those events MUST use operation numbers
   that correspond to the order in the original request.

2.5.1.3.  urn:ietf:params:scim:event:misc:asyncresp

   The Asynchronous Response Event signals the completion of a SCIM
   request.  The event payload contains the attributes defined in
   Section 3.7 of [RFC7644] and is the same as a single SCIM Bulk
   Response Operation as per Section 3.7.3 of [RFC7644].  In the event,
   the "txn" claim MUST be set to the value originally returned to the
   requesting SCIM client (see Section 2.5.1.1).

   {
     "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/2819c223-7f76-453a-919d-413861904646"
     },
     "txn": "734f0614e3274f288f93ac74119dcf78",
     "events":{
       "urn:ietf:params:scim:event:misc:asyncresp": {
           "method": "PUT",
           "version": "W\/\"huJj29dMNgu3WXPD\"",
           "status": "200"
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

            Figure 14: Example SCIM Asynchronous Response Event

   If an error occurs during asynchronous processing, the event
   operation MUST include a "response" attribute indicating a non-
   200-series HTTP status as defined in Section 3.7 of [RFC7644], and
   that "response" attribute MUST contain the sub-attributes defined in
   Section 3.12 of [RFC7644].  The "status" attribute of the event
   operation typically matches the "status" attribute of the response.

   {
    "jti": "6164f3bbf6ff41a88dc94f18cb0620e8",
    "sub_id": {
      "format": "scim",
      "uri": "/Users/2819c223-7f76-453a-919d-413861904646"
    },
    "txn": "734f0614e3274f288f93ac74119dcf78",
    "events":{
      "urn:ietf:params:scim:event:misc:asyncresp": {
          "method": "PUT",
          "version": "W\/\"huJj29dMNgu3WXPD\"",
          "status": "400",
          "response": {
              "schemas": [
                  "urn:ietf:params:scim:api:messages:2.0:Error"
              ],
              "scimType":"invalidSyntax",
              "detail": "Request is unparsable",
              "status":"400"
          }
      }
    },
    "iat": 1458505044,
    "iss":"https://scim.example.com",
    "aud":[
     "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
    ]
   }

         Figure 15: Example SCIM Asynchronous Error Response Event

   The following four figures show asynchronous completion events for
   the example in Section 3.7.3 of [RFC7644].

   {
     "jti": "dbae9d7506b34329aa7f2f0d3827848b",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/92b725cd-9465-4e7d-8c16-01f8e146b87a"
     },
     "txn": "2d80e537a3f64622b0347b641ebc8f44:1",
     "events":{
       "urn:ietf:params:scim:event:misc:asyncresp": {
            "method": "POST",
            "bulkId": "qwerty",
            "version": "W\/\"oY4m4wn58tkVjJxK\"",
            "status": "201"
       }
     },
     "iat": 1458505044,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

      Figure 16: Example SCIM Asynchronous Response Event Operation (1
                                   of 4)

   {
     "jti": "ca977d05ba5c43929e3a69023d5392a9",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/b7c14771-226c-4d05-8860-134711653041"
     },
     "txn": "2d80e537a3f64622b0347b641ebc8f44:2",
     "events":{
       "urn:ietf:params:scim:event:misc:asyncresp": {
             "method": "PUT",
             "version": "W\/\"huJj29dMNgu3WXPD\"",
             "status": "200"
       }
     },
     "iat": 1458505045,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

      Figure 17: Example SCIM Asynchronous Response Event Operation (2
                                   of 4)

   {
     "jti": "4bb87d70a4ab463bbdcd1f99111cbbf1",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/5d8d29d3-342c-4b5f-8683-a3cb6763ffcc"
     },
     "txn": "2d80e537a3f64622b0347b641ebc8f44:3",
     "events":{
       "urn:ietf:params:scim:event:misc:asyncresp": {
             "method": "PATCH",
             "version": "W\/\"huJj29dMNgu3WXPD\"",
             "status": "200"
       }
     },
     "iat": 1458505046,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

      Figure 18: Example SCIM Asynchronous Response Event Operation (3
                                   of 4)

   {
     "jti": "6a7843a7f5244d0eb62ca38b641d9139",
     "sub_id": {
       "format": "scim",
       "uri": "/Users/e9025315-6bea-44e1-899c-1e07454e468b"
     },
     "txn": "2d80e537a3f64622b0347b641ebc8f44:4",
     "events":{
       "urn:ietf:params:scim:event:misc:asyncresp": {
             "method": "DELETE",
             "status": "204"
       }
     },
     "iat": 1458505047,
     "iss":"https://scim.example.com",
     "aud":[
      "https://scim.example.com/Feeds/98d52461fa5bbc879593b7754"
     ]
   }

      Figure 19: Example SCIM Asynchronous Response Event Operation (4
                                   of 4)

3.  Set-Txn HTTP Response Header for Asynchronous Requests

   This specification defines a new HTTP header field, "Set-Txn", which
   serves the purpose of conveying request completion information to
   SCIM HTTP clients that request an asynchronous response as described
   in Section 2.5.1.1.  The header field MUST be used in SCIM responses
   when HTTP status code 202 (Accepted) is being returned with no
   message body.

   The "Set-Txn" HTTP header field value is a unique STRING (e.g., a
   Globally Unique Identifier (GUID)) used by the SCIM HTTP client to
   look for a matching SET event with a matching "txn" claim (see
   Section 2 of [RFC8417]) confirming the request completion status as
   described in Section 2.5.1.1.

   Intermediaries SHOULD NOT insert, modify, or delete the field's
   value.

   SCIM clients MAY ignore the header in cases where confirmation of
   completion is not required.  For example, a SCIM client may simply
   not want to wait for synchronous completion.

4.  Events Discovery Schema for Service Provider Configuration

   Section 5 of [RFC7643] defines SCIM service provider configuration
   schemas.  This section defines additional attributes that enable a
   SCIM client to discover the additional capabilities defined by this
   specification.

   securityEvents:
      A SCIM complex attribute that specifies the available capabilities
      related to asynchronous Security Events based on [RFC8417].  This
      attribute is OPTIONAL, and when absent, it indicates the SCIM
      service provider does not support or is not currently configured
      for Security Events.  The following sub-attributes are defined:

      asyncRequest:
         A case-insensitive string value specifying one of the
         following:

         *  "none" indicates that asynchronous SCIM requests defined in
            Section 2.5.1.1 are not supported;

         *  "long" indicates that the server completes requests
            asynchronously at the server's discretion (e.g., based on a
            max wait time); and

         *  "request" indicates that the server completes requests
            asynchronously when requested by the SCIM client.

      eventUris:
         A multivalued string listing the SET Event URIs (defined in
         [RFC8417]) that the server is capable of generating and
         delivering via a SET Stream (see [RFC8935] and [RFC8936]).
         This information is informational only.  Stream registration
         and configuration are out of scope of this specification.

5.  Security Considerations

   As this specification is based upon the SETs specification and the
   associated delivery specifications, the following security
   considerations are also applicable to this specification:

   *  Section 5 of [RFC8417] (Security Event Token)

   *  Section 5 of [RFC8935] (Push-Based SET Delivery Using HTTP)

   *  Section 4 of [RFC8936] (Poll-Based SET Delivery Using HTTP)

   SETs may contain sensitive information, including Personally
   Identifiable Information (PII).  In such cases, SET Transmitters and
   SET Recipients MUST protect the confidentiality of the SET contents
   in transit using TLS [BCP195].

   When coordinating provisioning between entities, the long-term series
   of changes may be critical to the information integrity and recovery
   requirements of both sides.  To address this, Event Publishers can
   make events available for receivers for longer periods of time than
   might typically be used for recovering from momentary delivery
   failures and retries per [RFC8935] or [RFC8936].  Similarly, Event
   Receivers MUST ensure events are persisted directly or indirectly to
   meet local recovery needs before acknowledging the SET Events were
   received.

   An attacker might leverage transaction and/or signal information
   contained in a SET Event Publisher or Receiver system.  To mitigate
   this, access to event recovery and forwarding MUST be limited to the
   parties needed to support recovery or SET forwarding.

   When SET Events are transferred in such a way that the Event
   Publisher is not communicating directly to the Event Receiver, it may
   become possible for an attacker or other system to insert an event.
   To mitigate, Event Receivers MUST verify the originator of a SET
   using JSON Web Signature (JWS) [RFC7515] signatures when the Event
   Publisher is not communicating directly with the Event Receiver.
   Validating event signatures may also be useful for auditing purposes
   as signed SET Events are protected from tampering in the event that
   an intermediate system, such as a TLS-terminating proxy, decrypts the
   SET payload before sending it onward to its intended recipient.

   In operation, some SCIM resources such as SCIM Groups may have a high
   rate of change.  For example, groups with more than a few thousand
   member values could lead to excessive change rates, which could lead
   to a loss of SET Events between Event Publishers and Event Receivers.
   To mitigate this risk, consider the following to help with throughput
   issues:

   *  The use of SCIM PUT (Section 3.5.1 of [RFC7644]), particularly
      with large SCIM Groups, can result in excessive data being
      conveyed in Security Event payloads.  Instead, it is RECOMMENDED
      to use SCIM PATCH (Section 3.5.2 of [RFC7644]) to focus on
      updating and notifying about changed information.  Alternatively,
      use SCIM PUT Event Notice
      (urn:ietf:params:scim:event:prov:put:notice) as a trigger to later
      retrieve the full information when needed.

   *  Use SCIM Patch Event Notice
      (urn:ietf:params:scim:event:prov:patch:notice) to reduce event
      content combined with periodic SCIM GETs (see Section 3.4 of
      [RFC7644]) to retrieve current group state.

   *  Aggregate multiple PATCH Events into a single event.  If providing
      the exact date of each membership change is not critical, consider
      using a PATCH to aggregate multiple membership changes into a
      single event.

   When using asynchronous SCIM requests (see Section 2.5.1.1), a SCIM
   service provider returns a SCIM Accepted response with a URI for
   retrieving the event result.  An unauthorized entity or attacker
   could obtain Asynchronous Request Completion Event information by
   querying the asynchronous operation result endpoint used by a SCIM
   service provider.  To mitigate, the returned URI endpoint MUST be
   protected and requires an HTTP Authorization header or some other
   form of client authentication.

6.  Privacy Considerations

   As this specification is based upon the SET specification and the
   associated delivery specifications, the following privacy
   considerations are also applicable to this specification:

   *  Section 6 of [RFC8417] (Security Event Token)

   *  Section 6 of [RFC8935] (Push-Based SET Delivery Using HTTP)

   *  Section 5 of [RFC8936] (Poll-Based SET Delivery Using HTTP)

   This specification enables the sharing of information between
   domains; therefore, it is assumed that implementers and deployers are
   operating under one of the following scenarios:

   *  A common administrative domain where there is one administrative
      owner of the data.  In these cases, the goal is to protect privacy
      and security of the owner and user data by keeping information
      systems coordinated and up to date.  For example, the domains
      decide to use DBR mode to keep employee information synchronized.

   *  In a cooperative or coordinated relationship, parties have decided
      to share a limited amount of data and/or signals for the benefits
      of their users.  Depending on end-user consent, information is
      shared on an as-authorized and/or as-needed basis.  For example,
      the domains agree to use CP mode that exchanges things such as
      account status or specific minimal attribute information that must
      be fetched on request after receiving notice of a change.  This
      enables authorization to be verified each time data is
      transferred.

   In general, the sharing of SCIM Event information falls within a pre-
   existing SCIM client and service provider relationship and carries no
   additional personal information.

7.  IANA Considerations

7.1.  SCIM Asynchronous Set-Txn Header Registration

   This specification registers the HTTP "Set-Txn" field name in the
   "Hypertext Transfer Protocol (HTTP) Field Name Registry" defined in
   Section 16.3.1 of [RFC9110].

   Field name:  Set-Txn
   Status:  permanent
   Reference:  Section 3 of RFC 9967.

7.2.  Registering Event Capability with SCIM Service Provider
      Configuration

   A reference to Section 4 of this document has been added to the
   "urn:ietf:params:scim:schemas:core:2.0:ServiceProviderConfig" entry
   in the "SCIM Server-Related Schema URIs" registry (Section 10.4 of
   [RFC7643]) under the "System for Cross-domain Identity Management
   (SCIM) Schema URIs" registry group.

7.3.  Creation of the SCIM Event URIs Registry

   IANA has created a new registry called "SCIM Event URIs" under the
   "System for Cross-domain Identity Management (SCIM) Schema URIs"
   registry group (Section 10.1 of [RFC7643]) at
   <https://www.iana.org/assignments/scim>.

   The registration procedure is Expert Review [RFC8126].  New
   registrations for this registry are evaluated by designated expert(s)
   for relevance to SCIM-based systems and to avoid possible duplication
   or conflict with other event definitions that may lie outside SCIM
   (e.g., Shared Signals [SSF]).

   Namespace ID:
      The sub-namespace ID of "event" is assigned within the "scim"
      namespace.

   Syntactic Structure:
      The Namespace Specific String (NSS) of all URNs that use the
      "event" Namespace ID has the following structure:

      "urn:ietf:params:scim:event:{class}:{name}:{other}"

      The keywords have the following meaning:

      class
         The class of events, which is one of: "feed", "prov", or
         "misc".

      name
         An ASCII string that conforms to URN syntax requirements (see
         [RFC8141]) and defines a descriptive event name (e.g.,
         "create").

      other
         An optional ASCII string that conforms to URN syntax
         requirements (see [RFC8141]) and serves as an additional sub-
         category or qualifier, for example, "full" and "notice".

   Identifier Uniqueness Considerations:
      The designated contact is responsible for reviewing and enforcing
      uniqueness.

   Identifier Persistence Considerations:
      Once a name has been allocated, it MUST NOT be reallocated for a
      different purpose.  The rules provided for the assignment of
      values within a sub-namespace MUST be constructed so that the
      meaning of values cannot change.  This registration mechanism is
      not appropriate for naming values whose meaning may change over
      time.

   Registration Format:
      An event registration MUST include the following fields:

      *  Event URI

      *  Descriptive name

      *  Reference to event definition

7.4.  Initial Contents of the SCIM Event URIs Registry

   IANA has added the following initial entries to the "SCIM Event URIs"
   registry:

   +==========================================+==============+=========+
   |Event URI                                 |Name          |Reference|
   +==========================================+==============+=========+
   |urn:ietf:params:scim:event:feed:add       |Resource      |Section  |
   |                                          |added to Feed |2.3.1 of |
   |                                          |Event         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:feed:remove    |Remove        |Section  |
   |                                          |resource from |2.3.2 of |
   |                                          |Feed Event    |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:create:   |New Resource  |Section  |
   |notice                                    |Event (notice |2.4.1 of |
   |                                          |only)         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:create:   |New Resource  |Section  |
   |full                                      |Event (full   |2.4.1 of |
   |                                          |data)         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:patch:    |Resource      |Section  |
   |notice                                    |Patch Event   |2.4.2 of |
   |                                          |(notice only) |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:patch:    |Resource      |Section  |
   |full                                      |Patch Event   |2.4.2 of |
   |                                          |(full data)   |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:put:      |Resource Put  |Section  |
   |notice                                    |Event (notice |2.4.3 of |
   |                                          |only)         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:put:full  |Resource Put  |Section  |
   |                                          |Event (full   |2.4.3 of |
   |                                          |data)         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:delete    |Resource      |Section  |
   |                                          |Deleted Event |2.4.4 of |
   |                                          |              |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:activate  |Resource      |Section  |
   |                                          |Activated     |2.4.5 of |
   |                                          |Event         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:prov:deactivate|Resource      |Section  |
   |                                          |Deactivated   |2.4.6 of |
   |                                          |Event         |RFC 9967 |
   +------------------------------------------+--------------+---------+
   |urn:ietf:params:scim:event:misc:asyncresp |Asynchronous  |Section  |
   |                                          |Request       |2.5.1 of |
   |                                          |Completion    |RFC 9967 |
   +------------------------------------------+--------------+---------+

                                  Table 1

8.  References

8.1.  Normative References

   [BCP195]   Best Current Practice 195,
              <https://www.rfc-editor.org/info/bcp195>.
              At the time of writing, this BCP comprises the following:

              Moriarty, K. and S. Farrell, "Deprecating TLS 1.0 and TLS
              1.1", BCP 195, RFC 8996, DOI 10.17487/RFC8996, March 2021,
              <https://www.rfc-editor.org/info/rfc8996>.

              Sheffer, Y., Saint-Andre, P., and T. Fossati,
              "Recommendations for Secure Use of Transport Layer
              Security (TLS) and Datagram Transport Layer Security
              (DTLS)", BCP 195, RFC 9325, DOI 10.17487/RFC9325, November
              2022, <https://www.rfc-editor.org/info/rfc9325>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC7240]  Snell, J., "Prefer Header for HTTP", RFC 7240,
              DOI 10.17487/RFC7240, June 2014,
              <https://www.rfc-editor.org/info/rfc7240>.

   [RFC7515]  Jones, M., Bradley, J., and N. Sakimura, "JSON Web
              Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May
              2015, <https://www.rfc-editor.org/info/rfc7515>.

   [RFC7519]  Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
              (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
              <https://www.rfc-editor.org/info/rfc7519>.

   [RFC7643]  Hunt, P., Ed., Grizzle, K., Wahlstroem, E., and C.
              Mortimore, "System for Cross-domain Identity Management:
              Core Schema", RFC 7643, DOI 10.17487/RFC7643, September
              2015, <https://www.rfc-editor.org/info/rfc7643>.

   [RFC7644]  Hunt, P., Ed., Grizzle, K., Ansari, M., Wahlstroem, E.,
              and C. Mortimore, "System for Cross-domain Identity
              Management: Protocol", RFC 7644, DOI 10.17487/RFC7644,
              September 2015, <https://www.rfc-editor.org/info/rfc7644>.

   [RFC8141]  Saint-Andre, P. and J. Klensin, "Uniform Resource Names
              (URNs)", RFC 8141, DOI 10.17487/RFC8141, April 2017,
              <https://www.rfc-editor.org/info/rfc8141>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8417]  Hunt, P., Ed., Jones, M., Denniss, W., and M. Ansari,
              "Security Event Token (SET)", RFC 8417,
              DOI 10.17487/RFC8417, July 2018,
              <https://www.rfc-editor.org/info/rfc8417>.

   [RFC8935]  Backman, A., Ed., Jones, M., Ed., Scurtescu, M., Ansari,
              M., and A. Nadalin, "Push-Based Security Event Token (SET)
              Delivery Using HTTP", RFC 8935, DOI 10.17487/RFC8935,
              November 2020, <https://www.rfc-editor.org/info/rfc8935>.

   [RFC8936]  Backman, A., Ed., Jones, M., Ed., Scurtescu, M., Ansari,
              M., and A. Nadalin, "Poll-Based Security Event Token (SET)
              Delivery Using HTTP", RFC 8936, DOI 10.17487/RFC8936,
              November 2020, <https://www.rfc-editor.org/info/rfc8936>.

   [RFC9110]  Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke,
              Ed., "HTTP Semantics", STD 97, RFC 9110,
              DOI 10.17487/RFC9110, June 2022,
              <https://www.rfc-editor.org/info/rfc9110>.

   [RFC9493]  Backman, A., Ed., Scurtescu, M., and P. Jain, "Subject
              Identifiers for Security Event Tokens", RFC 9493,
              DOI 10.17487/RFC9493, December 2023,
              <https://www.rfc-editor.org/info/rfc9493>.

8.2.  Informative References

   [RFC8126]  Cotton, M., Leiba, B., and T. Narten, "Guidelines for
              Writing an IANA Considerations Section in RFCs", BCP 26,
              RFC 8126, DOI 10.17487/RFC8126, June 2017,
              <https://www.rfc-editor.org/info/rfc8126>.

   [SCIM-EVENT-EXT]
              Hunt, P., Ed., Denniss, W., and M. Ansari, "SCIM Event
              Extension", Work in Progress, Internet-Draft, draft-hunt-
              idevent-scim-00, 20 March 2016,
              <https://datatracker.ietf.org/doc/html/draft-hunt-idevent-
              scim-00>.

   [SSF]      Tulshibagwale, A., Cappalli, T., Scurtescu, M., Backman,
              A., Bradley, J., and S. Miel, "OpenID Shared Signals
              Framework Specification 1.0", 29 August 2025,
              <https://openid.net/specs/openid-sharedsignals-framework-
              1_0.html>.

Appendix A.  Use Cases

   SCIM Events may be used in a number of ways.  The following non-
   normative sections describe some of the expected uses.

A.1.  Domain-Based Replication

   The objective of DBR events is to synchronize resource changes
   between SCIM service providers in a common administrative domain.  In
   this mode, complete information about modified resources are shared
   between replicas for immediate processing.

  +-------------+   +---------------------+   +------------------------+
  |SCIM Client A|   |SCIM Service Provider|   |Service Provider Replica|
  +-------------+   +---------------------+   +------------------------+
         |                     |                           |
         | [1] SCIM Operation  |                           |
         |-------------------->|                           |
         | [2] SCIM Response   |                           |
         |<--------------------|                           |
         |                     |                           |
         |                     | [3] Event SCIM:prov:<op>  |
         |                     |          id:xyz           |
         |                     |- - - - - - - - - - - - - >|
         |                     |                           |
         |                     |     [4] Update local node |--+
         |                     |                           |  |
         |                     |                           |<-+
         |                     |                           |
         v                     v                           v

               Figure 20: Domain-Based Replication Sequence

   From a security perspective, it is assumed that servers sharing DBR
   events are secured by a common access policy and all servers are
   required to be up to date.  From a privacy perspective, because all
   servers are in the same administrative domain, the primary objective
   is to keep individual service provider nodes or clusters
   synchronized.

A.2.  Coordinated Provisioning

   In CP, SCIM resource change events perform the function of change
   notification without the need to provide raw data.  In any Event
   Publisher and Receiver relationship, the set of SCIM resources (e.g.,
   Users) that are linked or coordinated is managed within the context
   of an event feed and may be a subset of the total set of resources on
   either side.  For example, an event feed could be limited to users
   who have consented to the sharing of information between domains.  To
   support capability, "feed" specific events are defined to indicate
   the addition and removal of SCIM resources from a feed.  For example,
   when a user consents to the sharing of information between domains,
   events about the User may be added to the feed between the Event
   Publisher and Receiver.

+-----------+  +---------------+  +-----------------+  +---------------+
|SCIM Client|  | SCIM Service  |  | Event Receiver  |  | Coord. Action |
|           |  |   Provider    |  |                 |  |   Endpoint    |
+-----------+  +---------------+  +-----------------+  +---------------+
      |                |                   |                   |
      | [1] SCIM       |                   |                   |
      |     Operation  |                   |                   |
      |--------------->|                   |                   |
      |                |                   |                   |
      | [2] SCIM       |                   |                   |
      |     Response   |                   |                   |
      |<---------------|                   |                   |
      |                |                   |                   |
      |                +=== loop ==========+===================+
      |                |                   |                   |
      |                | [3] Event         |                   |
      |                | SCIM:prov:<op>    |                   |
      |                | id:xyz            |                   |
      |                |- - - - - - - - - >|                   |
      |                |                   |                   |
      |                |                   | Note: Receiver    |
      |                |                   | may accumulate    |
      |                |                   | events for        |
      |                |                   | periodic action.  |
      |                |                   |                   |
      |                | [4] SCIM GET <id> |                   |
      |                |<------------------|                   |
      |                |                   |                   |
      |                | [5] Filtered      |                   |
      |                |     Resource      |                   |
      |                |     Response      |                   |
      |                |------------------>|                   |
      |                |                   |                   |
      |                |                   | [6] Coordinated   |
      |                |                   |     Action        |
      |                |                   |------------------>|
      |                |                   |                   |
      |                +=== end loop ======+===================+
      v                v                   v                   v

             Figure 21: Coordinated Provisioning Sequence

   In CP mode, the receiver of an event must call back to the
   originating SCIM service provider (e.g., using a SCIM GET request) to
   reconcile the newly changed resource in order to obtain the changes.

   CP has the following benefits:

   *  Differences in schema (e.g., attributes) between domains.  For
      example, a receiving domain may only be interested in or allowed
      to access to a few attributes (e.g., role-based access data) to
      enable access to an application.

   *  Different Event Receivers may have differing needs when accessing
      information and thus may be assigned varying access rights.
      Minimal information events combined with callbacks for data allows
      data filtering to be applied.

   *  Receivers can take independent action such as deciding which
      attributes or resource life cycle changes to accept.  For example,
      in the case of a conflict, a receiver can prioritize one domain
      source over another.

   *  A receiver may throttle or buffer changes rather than act
      immediately on a notification.  For example, for a frequently
      changing resource, the receiver may choose to make a scheduled
      SCIM GET for resources that have been marked "dirty" by events
      received in the last scheduled cycle.

   A disadvantage of the CP approach is that it may be considered costly
   in the sense that each event received might trigger a callback to the
   event issuer.  This cost should be weighed against the cost producing
   filtered information in each event for each receiver.  Furthermore, a
   receiver is not required to make a callback on every provisioning
   event.

   It is assumed that an underlying relationship between domains exists
   that permits the exchange of personal information and credentials.
   For example, in a cross-domain scenario, a SCIM service provider
   would have been previously authorized to perform SCIM provisioning
   operations and publish change events.  As such, appropriate
   confidentiality and privacy agreements should be in place between the
   domains.

   When sharing information between parties, CP Events minimize the
   information shared in each message and require the Security Event
   Receiver to receive more information from the Event Publisher as
   needed.  In this way, the Event Receiver is able to have regular
   access to information through normal SCIM protocol access
   restrictions.  The Event Receiver and Publisher may agree to
   communicate these updates through a variety of transmission methods
   such as push- and pull-based HTTP [RFC8935] [RFC8936] or HTTP GET
   (see Section 2.5.1.1); streaming technologies (e.g., Kafka or
   Kinesis); or webhooks such as in the Shared Signals Framework [SSF].

Acknowledgements

   The authors would like to thank the following contributors:

   *  Morteza Ansari and William Denniss, who contributed significantly
      to [SCIM-EVENT-EXT] upon which this document is based.

   *  The participants of the SCIM Working Group and the IETF id-event
      mailing list for their support of this specification.

   *  Deb Cooley, Dean Saxe, Elliot Lear, Pamela Dingle, Mark
      Nottingham, R Gideon, Paulo Jorge Correia, Shuping Peng, Elwyn
      Davies, Luigi Lannone, Mohamed Boucadair, Roman Danyliw, Ketan
      Talaulikar, Mahesh Jethanandani, and Mike Bishop for their write-
      ups and reviews.

Authors' Addresses

   Phil Hunt (editor)
   Independent Identity Inc
   Email: phil.hunt@independentid.com


   Nancy Cam-Winget
   Cisco Systems
   Email: ncamwing@cisco.com


   Mike Kiser
   Sailpoint Technologies
   Email: mike.kiser@sailpoint.com


   Jen Schreiber
   Workday, Inc.
   Email: jwschreib@gmail.com
