Western Alliance Bank Check Image API

openapi: 3.1.0
info:
  title: Western Alliance Bank Check image API
  version: v1
  description: 'Retrieves the image of a paid check by account, check date, check number, trace number and amount.


    Derived mechanically from the ''Check image API'' Postman collection published on the WAB API Developer Portal (family:
    Informational APIs). Every path, header, query parameter and request body comes from that collection; response bodies
    are not captured because the collection ships none.'
  contact:
    name: Western Alliance Bank API Developer Portal
    url: https://developer.westernalliancebank.com/s/
  termsOfService: https://www.westernalliancebancorporation.com/sites/default/files/2025-05/api-services-terms-conditions.pdf
  x-family: Informational
  x-generated-from: postman
  x-source: https://developer.westernalliancebank.com/sfsites/c/cms/delivery/media/MCHEOWJRLBUVGAZJ6PKRUB7QZUUA
  x-source-page: https://developer.westernalliancebank.com/s/postman-collection
  x-provenance:
    generated: '2026-09-17'
    method: derived
    source: postman/western-alliance-bancorporation-check-image-api.postman_collection.json
    note: Mechanical Postman -> OpenAPI conversion; no operations, parameters or examples were added beyond the collection.
servers:
- url: https://api-connect.westernalliancebank.com
  description: Production (Client ID / Client Secret and token issued at Treasury Management enrollment)
- url: https://api-connect.westernalliancebanktest.com
  description: Client UAT environment (all data must be fake / masked test data per the API Services Terms)
tags:
- name: Get Token
- name: Health Check
- name: Check Image
paths:
  /entitlements-get-token-eapi/api/v1/token:
    get:
      operationId: getToken
      summary: Get token
      tags:
      - Get Token
      parameters:
      - name: Scope
        in: query
        required: true
        schema:
          type: string
        example: Informational
      - name: appClientId
        in: header
        required: true
        schema:
          type: string
        description: Credential header (appClientId); value issued by Western Alliance Bank at enrollment. Never publish real
          values.
      - name: appClientSecret
        in: header
        required: true
        schema:
          type: string
        description: Credential header (appClientSecret); value issued by Western Alliance Bank at enrollment. Never publish
          real values.
      - name: X-Correlation-ID
        in: header
        required: true
        schema:
          type: string
          format: uuid
        description: Client-generated GUID used to correlate the request across WAB systems.
      - name: X-Source-System
        in: header
        required: false
        schema:
          type: string
      security: []
      responses:
        '200':
          description: Successful response. The published collection ships no saved response, so the response schema is not
            captured here.
  /info-check-image-eapi/api/v1/healthcheck:
    get:
      operationId: healthcheck
      summary: Healthcheck
      tags:
      - Health Check
      parameters:
      - name: X-Correlation-ID
        in: header
        required: true
        schema:
          type: string
          format: uuid
        description: Client-generated GUID used to correlate the request across WAB systems.
      - name: X-Dependent-Ping
        in: header
        required: true
        schema:
          type: string
        example: 'false'
      - name: X-Source-System
        in: header
        required: false
        schema:
          type: string
      security:
      - bearerToken: []
      responses:
        '200':
          description: Successful response. The published collection ships no saved response, so the response schema is not
            captured here.
  /info-check-image-eapi/api/v1/img/checks/{AccountNumber}:
    get:
      operationId: getCheckImage
      summary: Get Check Image
      tags:
      - Check Image
      parameters:
      - name: AccountNumber
        in: path
        required: true
        schema:
          type: string
      - name: CheckDate
        in: query
        required: true
        schema:
          type: string
      - name: CheckNumber
        in: query
        required: true
        schema:
          type: string
      - name: TraceNumber
        in: query
        required: true
        schema:
          type: string
      - name: Amount
        in: query
        required: true
        schema:
          type: string
      - name: X-Correlation-ID
        in: header
        required: true
        schema:
          type: string
          format: uuid
        description: Client-generated GUID used to correlate the request across WAB systems.
      - name: X-Source-System
        in: header
        required: false
        schema:
          type: string
      security:
      - bearerToken: []
      responses:
        '200':
          description: Successful response. The published collection ships no saved response, so the response schema is not
            captured here.
components:
  securitySchemes:
    bearerToken:
      type: http
      scheme: bearer
      description: Bearer token returned by GET /entitlements-get-token-eapi/api/v1/token (Token API) in exchange for the
        appClientId + appClientSecret headers. Tokens are valid for a limited period (API Services Terms 6(c)(iii)).
    appClientId:
      type: apiKey
      in: header
      name: appClientId
      description: Client ID assigned by WAB at enrollment (used with appClientSecret on the token endpoint).
    appClientSecret:
      type: apiKey
      in: header
      name: appClientSecret
      description: Client Secret known only to the client and the WAB API gateway.