openapi: 3.1.0
info:
  title: UKG Pro HCM Benefits Employment API
  version: 1.0.0
  summary: REST interface for the UKG Pro Human Capital Management suite.
  description: 'The UKG Pro HCM API exposes Human Capital Management resources (people,

    employment, benefits, payroll, talent, recruiting, onboarding) for the

    UKG Pro platform. The API is tenant-hosted: each customer has a unique

    base hostname. Core REST resources are authenticated with HTTP Basic

    Authentication using a web service account; onboarding and recruiting

    resources require a bearer Authorization Token issued by UKG.


    This specification documents the high-level surface confirmed from the

    public developer portal. Detailed schemas for tenant-specific resources

    require access to the authenticated developer portal.

    '
  contact:
    name: UKG Developer Portal
    url: https://developer.ukg.com/hcm
  license:
    name: Proprietary
    url: https://www.ukg.com/legal
servers:
- url: https://{tenantHostName}/api
  description: Tenant-specific UKG Pro HCM API host
  variables:
    tenantHostName:
      default: configuration.ultipro.com
      description: Customer-specific UKG Pro hostname assigned at provisioning
security:
- basicAuth: []
- bearerAuth: []
tags:
- name: Employment
  description: Employment history and changes
paths:
  /personnel/v1/employee-changes:
    get:
      tags:
      - Employment
      summary: List employee changes
      description: Retrieve a feed of employment change events within a date range.
      operationId: listEmployeeChanges
      parameters:
      - name: modifiedAfter
        in: query
        schema:
          type: string
          format: date-time
      - name: modifiedBefore
        in: query
        schema:
          type: string
          format: date-time
      responses:
        '200':
          description: Employee change collection
          content:
            application/json:
              schema:
                type: object
                properties:
                  items:
                    type: array
                    items:
                      $ref: '#/components/schemas/EmployeeChange'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    EmployeeChange:
      type: object
      properties:
        employeeId:
          type: string
        changeType:
          type: string
        effectiveDate:
          type: string
          format: date
        modifiedAt:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        code:
          type: string
        message:
          type: string
  responses:
    Unauthorized:
      description: Authentication required or invalid credentials
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    basicAuth:
      type: http
      scheme: basic
      description: HTTP Basic Authentication using a UKG Pro web service account.
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: Bearer Authorization Token issued for onboarding and recruiting APIs.