Dun & Bradstreet Authentication API

openapi: 3.2.0
info:
  title: D&B Direct+ Authentication API
  description: D&B Direct+ is Dun & Bradstreet's RESTful API platform that exposes the D&B Data Cloud — more than 500 million companies worldwide — for identity resolution, search, enrichment, multi-process (match plus enrich), batch processing, change monitoring, and historical research. All endpoints return JSON, are versioned in the URI path, and require an OAuth 2.0 bearer token obtained from the /v3/token endpoint via client-credentials grant. This profile is an OpenAPI sketch of the public surface based on Dun & Bradstreet's published Direct+ documentation; the canonical operation definitions live behind the gated developer portal at https://directplus.documentation.dnb.com/.
  version: '3.0'
  contact:
    name: D&B Direct+ Support
    url: https://service.dnb.com/
  termsOfService: https://www.dnb.com/utility-pages/terms-of-use.html
  license:
    name: Proprietary
    url: https://www.dnb.com/utility-pages/terms-of-use.html
servers:
- url: https://plus.dnb.com
  description: Production
tags:
- name: Authentication
  description: OAuth 2.0 token issuance for Direct+.
paths:
  /v3/token:
    post:
      tags:
      - Authentication
      summary: Generate Direct+ Access Token
      description: Exchange Direct+ API credentials for an OAuth 2.0 bearer access token using the client-credentials grant. The returned token is included as a Bearer authorization header on all subsequent Direct+ calls.
      operationId: generateAccessToken
      security:
      - basicAuth: []
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TokenRequest'
      responses:
        '200':
          description: Access token issued.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TokenResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
components:
  schemas:
    TokenRequest:
      type: object
      required:
      - grant_type
      properties:
        grant_type:
          type: string
          enum:
          - client_credentials
    TokenResponse:
      type: object
      properties:
        access_token:
          type: string
        token_type:
          type: string
          example: Bearer
        expirationDateTime:
          type: string
          format: date-time
    TransactionDetail:
      type: object
      properties:
        transactionID:
          type: string
        transactionTimestamp:
          type: string
          format: date-time
        inLanguage:
          type: string
        serviceVersion:
          type: string
    Error:
      type: object
      properties:
        transactionDetail:
          $ref: '#/components/schemas/TransactionDetail'
        error:
          type: object
          properties:
            errorMessage:
              type: string
            errorCode:
              type: string
            errorDetails:
              type: array
              items:
                type: object
  responses:
    Unauthorized:
      description: Missing or invalid bearer token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
    basicAuth:
      type: http
      scheme: basic