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OpenAPI Specification

openapi: 3.2.0
info:
  title: TIAA Secure Income Account Participants API
  description: The TIAA Secure Income Account (SIA) API enables recordkeepers and plan administrators to integrate TIAA's guaranteed lifetime income product into custom target-date model portfolios and managed account solutions. The SIA API supports participant account setup, contribution management, allocation updates, and income projection calculations for defined contribution plans. Authentication uses OAuth 2.0 Client Credentials Flow.
  version: '1.0'
  contact:
    name: TIAA Developer Support
    url: https://developer.tiaa.org/public/sia
servers:
- url: https://api.tiaa.org/sia/v1
  description: TIAA SIA Production API
tags:
- name: Participants
  description: Participant account management
paths:
  /plans/{planId}/participants:
    get:
      operationId: listParticipants
      summary: List Plan Participants
      description: Returns participants enrolled in the SIA product for a given plan.
      tags:
      - Participants
      security:
      - ClientCredentials: []
      parameters:
      - name: planId
        in: path
        required: true
        schema:
          type: string
        description: Unique plan identifier
      - name: page
        in: query
        schema:
          type: integer
      - name: pageSize
        in: query
        schema:
          type: integer
      responses:
        '200':
          description: List of participants
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ParticipantList'
        '401':
          description: Unauthorized
        '403':
          description: Forbidden
    post:
      operationId: enrollParticipant
      summary: Enroll Participant in SIA
      description: Enrolls a new participant in the Secure Income Account product for the plan.
      tags:
      - Participants
      security:
      - ClientCredentials: []
      parameters:
      - name: planId
        in: path
        required: true
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ParticipantEnrollment'
      responses:
        '201':
          description: Participant enrolled
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Participant'
        '400':
          description: Invalid request
  /plans/{planId}/participants/{participantId}:
    get:
      operationId: getParticipant
      summary: Get Participant Details
      description: Returns SIA account details for a specific participant.
      tags:
      - Participants
      security:
      - ClientCredentials: []
      parameters:
      - name: planId
        in: path
        required: true
        schema:
          type: string
      - name: participantId
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Participant details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Participant'
        '404':
          description: Participant not found
components:
  schemas:
    ParticipantEnrollment:
      type: object
      required:
      - firstName
      - lastName
      - dateOfBirth
      - ssn
      properties:
        firstName:
          type: string
        lastName:
          type: string
        dateOfBirth:
          type: string
          format: date
        ssn:
          type: string
          description: Social Security Number (encrypted)
        email:
          type: string
          format: email
        allocationPercentage:
          type: number
          format: double
          description: Initial SIA allocation percentage
    Participant:
      type: object
      properties:
        participantId:
          type: string
        planId:
          type: string
        firstName:
          type: string
        lastName:
          type: string
        dateOfBirth:
          type: string
          format: date
        enrollmentDate:
          type: string
          format: date
        accountBalance:
          type: number
          format: double
        vestingPercentage:
          type: number
          format: double
        status:
          type: string
          enum:
          - ACTIVE
          - TERMINATED
          - RETIRED
          - DECEASED
    ParticipantList:
      type: object
      properties:
        participants:
          type: array
          items:
            $ref: '#/components/schemas/Participant'
        totalElements:
          type: integer
        page:
          type: integer
        pageSize:
          type: integer
  securitySchemes:
    ClientCredentials:
      type: oauth2
      flows:
        clientCredentials:
          tokenUrl: https://auth.tiaa.org/oauth2/token
          scopes:
            sia:read: Read SIA data
            sia:write: Write SIA data