Western Alliance Bank Book Transfer API

openapi: 3.2.0
info:
  title: Western Alliance Bank Book Transfer API
  version: v1
  description: 'Moves funds between two Western Alliance accounts held by the same client (book transfer).


    Derived mechanically from the ''Book Transfer API'' Postman collection published on the WAB API Developer Portal (family: Transactional 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: Transactional
  x-generated-from: postman
  x-source: https://developer.westernalliancebank.com/sfsites/c/cms/delivery/media/MC7LBVXMMYIJAXBABHXRZSLULAPM
  x-source-page: https://developer.westernalliancebank.com/s/postman-collection
  x-provenance:
    generated: '2026-09-17'
    method: derived
    source: postman/western-alliance-bancorporation-book-transfer-api.postman_collection.json
    note: Mechanical Postman -> OpenAPI conversion; no operations, parameters or examples were added beyond the collection.
    collection_quirks:
    - Request 'Healthcheck' in folder 'Health Check' references an undefined collection variable in its host/base-path (api-connect.westernalliancebank.com{BASE_PATH_PRIORDAY_SERVICE}) and was NOT carried; the collection as published cannot resolve it.
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: Book Transfer
paths:
  /info-book-transfer-eapi/api/v1/dp/transactions/transfer:
    post:
      operationId: bookTransfer
      summary: Book Transfer
      tags:
      - Book Transfer
      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-Source-System
        in: header
        required: false
        schema:
          type: string
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                StandardDollarTransferData:
                  type: object
                  properties:
                    FromAccountNumber:
                      type: string
                    TransactionAmount:
                      type: integer
                    FromTrailerDescription:
                      type: string
                    ToAccountNumber:
                      type: string
                    ToTrailerDescription:
                      type: string
            example:
              StandardDollarTransferData:
                FromAccountNumber: '{{From_AccountNumber}}'
                TransactionAmount: 1
                FromTrailerDescription: test source trailer description
                ToAccountNumber: '{{To_AccountNumber}}'
                ToTrailerDescription: test destination trailer description
      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.