> ## Documentation Index > Fetch the complete documentation index at: https://developers.dwolla.com/llms.txt > Use this file to discover all available pages before exploring further. # Retrieve a transfer failure reason > Retrieve detailed failure information for a failed bank or VAN transfer including the ACH return code, description, and explanation. Returns failure details with links to the failed funding source and associated Customer for comprehensive error analysis. Available only for transfers with failure status and accessed through the failure link from transfer retrieval. Critical for troubleshooting payment failures and understanding ACH return reasons. ## OpenAPI ````yaml get /transfers/{id}/failure openapi: 3.1.0 info: title: Dwolla API description: Dwolla API Documentation contact: name: Dwolla Developer Relations Team url: https://developers.dwolla.com email: api@dwolla.com version: '2.0' termsOfService: https://www.dwolla.com/legal/tos/ license: name: MIT url: https://github.com/Dwolla/dwolla-openapi/blob/master/LICENSE servers: - url: https://api.dwolla.com description: Production server - url: https://api-sandbox.dwolla.com description: Sandbox server security: - clientCredentials: [] tags: - name: tokens description: Operations related to Application Access Tokens - name: root description: Root API operations - name: accounts description: Operations related to Accounts - name: customers description: Operations related to Customers - name: kba description: Operations related to Knowledge-Based Authentication - name: beneficial owners description: Operations related to Beneficial Owners - name: documents description: Operations related to Documents - name: exchanges description: Operations related to Exchanges - name: exchange sessions description: Operations related to Exchange Sessions - name: funding sources description: Operations related to Funding Sources - name: transfers description: Operations related to Transfers - name: labels description: Operations related to Labels - name: mass payments description: Operations related to Mass Payments - name: events description: Operations related to Events - name: webhook subscriptions description: Operations related to Webhook Subscriptions - name: webhooks description: Operations related to Webhooks - name: client tokens description: Operations related to Client Tokens - name: sandbox simulations description: Sandbox-only operations for simulating processing of bank transfers paths: /transfers/{id}/failure: get: tags: - transfers summary: Retrieve a transfer failure reason description: >- Retrieve detailed failure information for a failed bank or VAN transfer including the ACH return code, description, and explanation. Returns failure details with links to the failed funding source and associated Customer for comprehensive error analysis. Available only for transfers with failure status and accessed through the failure link from transfer retrieval. Critical for troubleshooting payment failures and understanding ACH return reasons. operationId: getTransferFailureReason parameters: - name: id in: path description: Transfer unique identifier required: true schema: type: string - $ref: '#/components/parameters/Accept' responses: '200': description: successful operation headers: {} content: application/vnd.dwolla.v1.hal+json: schema: type: object required: - code - description properties: _links: type: object additionalProperties: $ref: '#/components/schemas/HalLink' code: type: string example: R03 description: type: string example: No Account/Unable to Locate Account explanation: type: string example: >- The account number does not correspond to the individual identified in the entry or a valid account. '403': description: 403 Forbidden headers: {} content: application/vnd.dwolla.v1.hal+json: schema: $ref: '#/components/schemas/ForbiddenError' '404': description: 404 Not Found headers: {} content: application/vnd.dwolla.v1.hal+json: schema: $ref: '#/components/schemas/NotFoundError' x-codeSamples: - lang: bash source: > GET https://api-sandbox.dwolla.com/transfers/8997ebed-69be-e611-80ea-0aa34a9b2388/failure Accept: application/vnd.dwolla.v1.hal+json Authorization: Bearer pBA9fVDBEyYZCEsLf/wKehyh1RTpzjUj5KzIRfDi0wKTii7DqY - lang: javascript source: > // Using dwolla-v2 - https://github.com/Dwolla/dwolla-v2-node var transferUrl = "https://api-sandbox.dwolla.com/transfers/83eb4b5e-a5d9-e511-80de-0aa34a9b2388"; dwolla.get(`${transferUrl}/failure`).then((res) => res.body.code); // => 'R01' - lang: python source: > # Using dwollav2 - https://github.com/Dwolla/dwolla-v2-python transfer_url = 'https://api-sandbox.dwolla.com/transfers/83eb4b5e-a5d9-e511-80de-0aa34a9b2388' failure = app_token.get('%s/failure' % transfer_url) failure.body['code'] # => 'R01' - lang: php source: > failureById($transferUrl); $transferFailure->code; # => "R01" ?> - lang: ruby source: > # Using dwolla_v2 - https://github.com/Dwolla/dwolla-v2-ruby transfer_url = 'https://api-sandbox.dwolla.com/transfers/83eb4b5e-a5d9-e511-80de-0aa34a9b2388' failure = app_token.get "#{transfer_url}/failure" failure.code # => "R01" components: parameters: Accept: name: Accept in: header required: true description: >- The media type of the response. Must be application/vnd.dwolla.v1.hal+json schema: type: string enum: - application/vnd.dwolla.v1.hal+json default: application/vnd.dwolla.v1.hal+json schemas: HalLink: title: HalLink type: object properties: href: type: string example: https://api.dwolla.com type: type: string example: application/vnd.dwolla.v1.hal+json resource-type: type: string example: resource-type ForbiddenError: title: ForbiddenError description: Error response schema for 403 Forbidden type: object required: - code - message properties: code: type: string example: Forbidden message: type: string example: The supplied credentials are not authorized for this resource. NotFoundError: title: NotFoundError description: Error response schema for 404 NotFound type: object required: - code - message properties: code: type: string example: NotFound message: type: string example: The requested resource was not found. securitySchemes: clientCredentials: type: oauth2 flows: clientCredentials: tokenUrl: /token x-speakeasy-token-endpoint-authentication: client_secret_basic scopes: {} ````