openapi: 3.1.0
info:
  title: Fiserv BankingHub 3-D Secure Signature Capture API
  description: The Fiserv BankingHub API provides RESTful access to core banking operations including account management, transactions, transfers, payments, and party (customer) management. BankingHub enables financial institutions and fintech partners to integrate account opening, fund transfers, payment processing, and customer data management into their applications.
  version: 1.0.0
  contact:
    name: Fiserv Developer Support
    url: https://developer.fiserv.com/product/BankingHub
  termsOfService: https://www.fiserv.com/en/legal.html
servers:
- url: https://cert.api.fiservapps.com
  description: Certification Environment
- url: https://prod.api.fiservapps.com
  description: Production Environment
security:
- bearerAuth: []
tags:
- name: Signature Capture
  description: Submit signature capture data for completed transactions.
paths:
  /sigcap:
    put:
      operationId: submitSignatureCapture
      summary: Fiserv Submit a signature capture
      description: Submits a captured signature image for a completed transaction. The signature data is associated with the transaction for record-keeping and dispute resolution.
      tags:
      - Signature Capture
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SignatureCaptureRequest'
      responses:
        '200':
          description: Signature captured
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SignatureCaptureResponse'
        '400':
          description: Bad request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '401':
          description: Unauthorized
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    SignatureCaptureResponse:
      type: object
      description: Signature capture response payload.
      properties:
        retref:
          type: string
          description: The retrieval reference number.
        respstat:
          type: string
          description: The response status.
        respcode:
          type: string
          description: The response code.
        resptext:
          type: string
          description: The response text.
    ErrorResponse:
      type: object
      description: Error response payload.
      properties:
        respstat:
          type: string
          description: The response status (C for declined/error).
        respcode:
          type: string
          description: The error response code.
        resptext:
          type: string
          description: A human-readable error message.
    SignatureCaptureRequest:
      type: object
      description: Signature capture request payload.
      required:
      - merchid
      - retref
      - signature
      properties:
        merchid:
          type: string
          description: The CardPointe merchant ID.
        retref:
          type: string
          description: The retrieval reference number of the transaction.
        signature:
          type: string
          description: The base64-encoded signature image data.
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: OAuth 2.0 Bearer token for API authentication.
externalDocs:
  description: BankingHub API Documentation
  url: https://developer.fiserv.com/product/BankingHub/docs/?path=docs/get-started.md