3GPP TS 29.522 VFL Inference API

openapi: 3.0.0

info:
  title: 3gpp-vfl-inference
  version: 1.0.1
  description: |
    API for VFL Inference.  
    © 2026, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).  
    All rights reserved.

externalDocs:
  description: >
     3GPP TS 29.522 V19.6.0; 5G System; Network Exposure Function Northbound APIs.
  url: https://www.3gpp.org/ftp/Specs/archive/29_series/29.522/

servers:
  - url: '{apiRoot}/3gpp-vfl-inference/v1'
    variables:
      apiRoot:
        default: https://example.com
        description: apiRoot as defined in clause 4.4 of 3GPP TS 29.501

security:
  - {}
  - oAuth2ClientCredentials:
    - 3gpp-vfl-inference
    

paths:
  /{afId}/subscriptions:
    parameters:
      - name: afId
        in: path
        description: Represents the identifier of the AF.
        required: true
        schema:
          type: string

    get:
      summary: Retrieve all the active VFL Inference Subscriptions for the given AF.
      operationId: GetVFLInferenceSubscriptions
      tags:
        - VFL Inference Subscriptions (Collection)
      responses:
        '200':
          description: >
            OK. All the Individual VFL Inference Subscription resource(s) managed
            by the NEF for the requested AF are returned.
            If there are no active Individual VFL Inference Subscription resources
            at the NEF for the requested AF, an empty array is returned.
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/VflInferSub'
                minItems: 0
        '307':
          $ref: 'TS29122_CommonData.yaml#/components/responses/307'
        '308':
          $ref: 'TS29122_CommonData.yaml#/components/responses/308'
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '406':
          $ref: 'TS29122_CommonData.yaml#/components/responses/406'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'

    post:
      summary: Create a new Individual VFL Inference Subscription resource.
      operationId: CreateVFLInferenceSubcription
      tags:
        - Subscriptions (Collection)
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VflInferSub'
      responses:
        '201':
          description: Create a new Individual VFL Inference Subscription resource.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VflInferSub'
          headers:
            Location:
              description: >
                Contains the URI of the newly created resource, according to the
                structure 
                {apiRoot}/3gpp-vfl-inference/v1/{afId}/subscriptions/{subscriptionId}.
              required: true
              schema:
                type: string
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '411':
          $ref: 'TS29122_CommonData.yaml#/components/responses/411'
        '413':
          $ref: 'TS29122_CommonData.yaml#/components/responses/413'
        '415':
          $ref: 'TS29122_CommonData.yaml#/components/responses/415'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'
      callbacks:
        myNotification:
          '{$request.body#/notifUri}':
            post:
              requestBody:
                required: true
                content:
                  application/json:
                    schema:
                      $ref: 'TS29520_Nnwdaf_VFLInference.yaml#/components/schemas/VflInferNotif'
              responses:
                '204':
                  description: No Content, Notification was successful
                '307':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/307'
                '308':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/308'
                '400':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/400'
                '401':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/401'
                '403':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/403'
                '404':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/404'
                '411':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/411'
                '413':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/413'
                '415':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/415'
                '429':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/429'
                '500':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/500'
                '503':
                  $ref: 'TS29122_CommonData.yaml#/components/responses/503'
                default:
                  $ref: 'TS29122_CommonData.yaml#/components/responses/default'

  /{afId}/subscriptions/{subscriptionId}:
    parameters:
      - name: afId
        in: path
        description: Represents the identifier of the AF.
        required: true
        schema:
          type: string
      - name: subscriptionId
        in: path
        description: String identifying a VFL Inference Subscription.
        required: true
        schema:
          type: string

    get:
      summary: Retrieve an existing Individual VFL Inference Subscription.
      operationId: GetVFLInferenceSubscription
      tags:
        - Individual VFL Inference Subscription (Document)
      responses:
        '200':
          description: >
            OK. The requested Individual VFL Inference Subscription resource is
            successfully returned in the response body.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VflInferSub'
        '307':
          $ref: 'TS29122_CommonData.yaml#/components/responses/307'
        '308':
          $ref: 'TS29122_CommonData.yaml#/components/responses/308'
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '406':
          $ref: 'TS29122_CommonData.yaml#/components/responses/406'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'

    put:
      summary: Update an existing Individual VFL Inference Subscription
      operationId: UpdateVFLInferenceSubcription
      tags:
        - Individual VFL Inference Subscription (Document)
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VflInferSub'
      responses:
        '200':
          description: >
            The Individual VFL Inference Subscription resource was modified
            successfully and a representation of that resource is returned.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VflInferSub'
        '204':
          description: >
            The Individual VFL Inference Subscription resource was modified
            successfully.
        '307':
          $ref: 'TS29122_CommonData.yaml#/components/responses/307'
        '308':
          $ref: 'TS29122_CommonData.yaml#/components/responses/308'
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '411':
          $ref: 'TS29122_CommonData.yaml#/components/responses/411'
        '413':
          $ref: 'TS29122_CommonData.yaml#/components/responses/413'
        '415':
          $ref: 'TS29122_CommonData.yaml#/components/responses/415'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'

    patch:
      summary: Partial update an existing Individual VFL Inference Subscription
      operationId: PartialUpdateVFLInferenceSubcription
      tags:
        - Individual VFL Inference Subscription (Document)
      requestBody:
        required: true
        content:
          application/merge-patch+json:
            schema:
              $ref: '#/components/schemas/VflInferSubPatch'
      responses:
        '200':
          description: >
            The Individual VFL Inference Subscription resource was partial
            modified successfully and a representation of that resource is returned.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VflInferSub'
        '204':
          description: >
            The Individual VFL Inference Subscription resource was partial
            modified successfully.
        '307':
          $ref: 'TS29122_CommonData.yaml#/components/responses/307'
        '308':
          $ref: 'TS29122_CommonData.yaml#/components/responses/308'
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '411':
          $ref: 'TS29122_CommonData.yaml#/components/responses/411'
        '413':
          $ref: 'TS29122_CommonData.yaml#/components/responses/413'
        '415':
          $ref: 'TS29122_CommonData.yaml#/components/responses/415'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'

    delete:
      summary: Delete an existing Individual VFL Inference Subscription.
      operationId: DeleteVFLInferenceSubcription
      tags:
        - Individual VFL Inference Subscription (Document)
      responses:
        '204':
          description: >
            No Content. The Individual VFL Inference Subscription matching the
            subscriptionId was deleted.
        '307':
          $ref: 'TS29122_CommonData.yaml#/components/responses/307'
        '308':
          $ref: 'TS29122_CommonData.yaml#/components/responses/308'
        '400':
          $ref: 'TS29122_CommonData.yaml#/components/responses/400'
        '401':
          $ref: 'TS29122_CommonData.yaml#/components/responses/401'
        '403':
          $ref: 'TS29122_CommonData.yaml#/components/responses/403'
        '404':
          $ref: 'TS29122_CommonData.yaml#/components/responses/404'
        '429':
          $ref: 'TS29122_CommonData.yaml#/components/responses/429'
        '500':
          $ref: 'TS29122_CommonData.yaml#/components/responses/500'
        '503':
          $ref: 'TS29122_CommonData.yaml#/components/responses/503'
        default:
          $ref: 'TS29122_CommonData.yaml#/components/responses/default'

components:
  securitySchemes:
    oAuth2ClientCredentials:
      type: oauth2
      flows:
        clientCredentials:
          tokenUrl: '{nrfApiRoot}/oauth2/token'
          scopes:
            3gpp-vfl-inference: Access to the VFLInference API

  schemas:
    VflInferSub:
      description: Represents a VFL Inference subscription.
      type: object
      properties:
        notifCorrId:
          type: string
          description: >
            String identifying the Notification Correlation ID in the corresponding
            notification.
        notifUri:
          $ref: 'TS29571_CommonData.yaml#/components/schemas/Uri'
        extNwdafId:
          type: string
          description: >
            Contains the external identifier of the target NWDAF acting as VFL client.
        reportingReqs:
          $ref: 'TS29523_Npcf_EventExposure.yaml#/components/schemas/ReportingInformation'
        suppFeats:
          $ref: 'TS29571_CommonData.yaml#/components/schemas/SupportedFeatures'
        vflInferAnaSubs:
          type: array
          items:
            $ref: 'TS29520_Nnwdaf_VFLInference.yaml#/components/schemas/VflInferAnaSub'
          minItems: 1
          description: Represents inference subscription per analytics Id.
        vflInferResults:
          type: array
          items:
            $ref: 'TS29520_Nnwdaf_VFLInference.yaml#/components/schemas/VflInferResult'
          minItems: 1
          description: Represents intermediate VFL Inference result.
      required:
        - notifUri
        - notifCorrId
        - vflInferAnaSubs

    VflInferSubPatch:
      description: >
        Represents parameters to request the modification of a VFL Inference
        subscription.
      type: object
      properties:
        notifUri:
          $ref: 'TS29571_CommonData.yaml#/components/schemas/Uri'
        notifCorrId:
          type: string
          description: >
            String identifying the Notification Correlation ID in the corresponding
            notification.
        reportingReqs:
          $ref: 'TS29523_Npcf_EventExposure.yaml#/components/schemas/ReportingInformation'
        vflInferAnaSubs:
          type: array
          items:
            $ref: 'TS29520_Nnwdaf_VFLInference.yaml#/components/schemas/VflInferAnaSub'
          minItems: 1
          description: Represents inference subscription per analytics Id.