> ## 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. # Create an on-demand transfer authorization > Create an on-demand transfer authorization that allows Customers to pre-authorize variable amount ACH transfers from their bank account for future payments. This authorization is used when creating Customer funding sources to enable flexible payment processing. Returns UI text elements including authorization body text and button text for display in your application's bank account addition flow. ## OpenAPI ````yaml post /on-demand-authorizations 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: /on-demand-authorizations: post: tags: - funding sources summary: Create an on-demand transfer authorization description: >- Create an on-demand transfer authorization that allows Customers to pre-authorize variable amount ACH transfers from their bank account for future payments. This authorization is used when creating Customer funding sources to enable flexible payment processing. Returns UI text elements including authorization body text and button text for display in your application's bank account addition flow. operationId: createOnDemandTransferAuthorization parameters: - $ref: '#/components/parameters/Accept' responses: '200': description: Ok headers: {} content: application/vnd.dwolla.v1.hal+json: schema: $ref: '#/components/schemas/OnDemandAuthorization' '403': description: 403 Error headers: {} content: application/vnd.dwolla.v1.hal+json: schema: $ref: '#/components/schemas/ForbiddenError' x-codeSamples: - lang: bash source: > POST https://api-sandbox.dwolla.com/on-demand-authorizations Accept: application/vnd.dwolla.v1.hal+json Content-Type: application/vnd.dwolla.v1.hal+json Authorization: Bearer pBA9fVDBEyYZCEsLf/wKehyh1RTpzjUj5KzIRfDi0wKTii7DqY { "_links": { "self": { "href": "https://api-sandbox.dwolla.com/on-demand-authorizations/30e7c028-0bdf-e511-80de-0aa34a9b2388" } }, "bodyText": "I agree that future payments to Company ABC inc. will be processed by the Dwolla payment system from the selected account above. In order to cancel this authorization, I will change my payment settings within my Company ABC inc. account.", "buttonText": "Agree & Continue" } - lang: javascript source: > // Using dwolla-v2 - https://github.com/Dwolla/dwolla-v2-node dwolla.post("on-demand-authorizations").then((res) => res.body.buttonText); // => "Agree & Continue" - lang: python source: | # Using dwollav2 - https://github.com/Dwolla/dwolla-v2-python on_demand_authorization = app_token.post('on-demand-authorizations') on_demand_authorization.body['buttonText'] # => 'Agree & Continue' - lang: php source: > createAuthorization(); $onDemandAuth->_links["self"]->href; # => "https://api-sandbox.dwolla.com/on-demand-authorizations/30e7c028-0bdf-e511-80de-0aa34a9b2388" ?> - lang: ruby source: | # Using dwolla_v2 - https://github.com/Dwolla/dwolla-v2-ruby on_demand_authorization = app_token.post "on-demand-authorizations" on_demand_authorization.buttonText # => "Agree & Continue" 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: OnDemandAuthorization: title: OnDemandAuthorization type: object properties: _links: type: object properties: self: type: object properties: href: type: string example: >- https://api.dwolla.com/on-demand-authorizations/30e7c028-0bdf-e511-80de-0aa34a9b2388 bodyText: type: string example: >- I agree that future payments to Company ABC inc. will be processed by the Dwolla payment system from the selected account above. In order to cancel this authorization, I will change my payment settings within my Company ABC inc. account. buttonText: type: string example: Agree & Continue 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. securitySchemes: clientCredentials: type: oauth2 flows: clientCredentials: tokenUrl: /token x-speakeasy-token-endpoint-authentication: client_secret_basic scopes: {} ````