> ## Documentation Index > Fetch the complete documentation index at: https://docs.fernhq.com/llms.txt > Use this file to discover all available pages before exploring further. # Cancel transaction > Cancel a transaction by ID ## OpenAPI ````yaml https://api.fernhq.com/json delete /transactions/{transactionId} openapi: 3.1.1 info: title: Fern Developer API description: >- Fern is a seamless currency conversion and payments API that enables developers to integrate onramps, offramps, and third-party fiat/crypto payments into their applications. Fern works with licensed liquidity providers and financial institutions to offer global currency support in one standardized API. termsOfService: https://fernhq.com/terms version: 1.0.0 contact: name: Fern API Support url: https://support.fernhq.com email: support@fernhq.com servers: - url: https://api.fernhq.com description: API Server security: - bearerAuth: [] tags: - name: Customers description: >- Use Customers API to create a customer, update their details, and get their details. - name: Payment Accounts description: >- Use Payment Accounts API to add, update and get bank accounts for an existing customer. Currently, only USD bank accounts with domestic ACH/wire routing numbers are supported. - name: Quotes description: >- Use Quotes API to create and fetch quotes for transactions. Currently, onramp and offramp transaction types are supported and will be inferred from the source and destination. Before you can create a transaction, you must create a quote. Quotes enable you to specify important information about the transaction, such as the source and destination currencies and accounts and your developer fees. Quotes also provide useful information that you can use to display in your application, such as exchange rates and total fees. - **Quotes expire after 5 minutes** - You must create a quote before you create a transaction, and you will use the quote ID when creating a transaction. - Quotes can only be created for verified customers. /n- Once you create a transaction with a quote, that quote can no longer be used. To generate a new transaction, you will have to create a new quote. - name: Transactions description: >- Use Transactions API to create and get transactions for a customer and a quote. Requires the creation of a quote beforehand per transaction. - name: Automation Rules description: >- Use Automation Rules API to create and manage automation rules for a customer. - name: Webhooks description: >- Use Webhooks API to manage webhook endpoints and view recent webhook deliveries. paths: /transactions/{transactionId}: delete: tags: - Transactions summary: Cancel transaction description: Cancel a transaction by ID operationId: cancelTransaction parameters: - schema: format: uuid type: string example: 1d8beb26-b4d1-47ee-8e5d-0d3905f200c7 in: path name: transactionId required: true description: Unique identifier of the transaction responses: '200': description: Schema for result message when cancelling a transaction content: application/json: schema: type: object properties: message: type: string description: Message describing the result of the cancellation example: Transaction cancelled successfully required: - message additionalProperties: false title: Cancel Transaction Response Schema description: Schema for result message when cancelling a transaction '400': description: Bad Request content: application/json: schema: description: Bad Request type: object properties: message: type: string description: Human-readable error message example: Invalid input provided code: type: string description: Error code for programmatic handling example: VALIDATION_ERROR details: description: Additional error context required: - message additionalProperties: false examples: example1: value: code: BAD_REQUEST message: '' statusCode: 400 example2: value: code: VALIDATION_ERROR message: Invalid body data details: - path: [] message: '' location: body statusCode: 400 '401': description: Unauthorized content: application/json: schema: description: Unauthorized type: object properties: message: type: string description: Human-readable error message example: Invalid input provided code: type: string description: Error code for programmatic handling example: VALIDATION_ERROR details: description: Additional error context required: - message additionalProperties: false example: code: UNAUTHORIZED message: Missing API Key statusCode: 401 '403': description: Forbidden content: application/json: schema: description: Forbidden type: object properties: message: type: string description: Human-readable error message example: Invalid input provided code: type: string description: Error code for programmatic handling example: VALIDATION_ERROR details: description: Additional error context required: - message additionalProperties: false example: code: FORBIDDEN message: '' statusCode: 403 '404': description: Not Found content: application/json: schema: description: Not Found type: object properties: message: type: string description: Human-readable error message example: Invalid input provided code: type: string description: Error code for programmatic handling example: VALIDATION_ERROR details: description: Additional error context required: - message additionalProperties: false example: code: NOT_FOUND message: >- Customer not found with id 9eb88b00-f04f-409b-9df7-7dcc9003bc35 statusCode: 404 '500': description: Internal Server Error content: application/json: schema: description: Internal Server Error type: object properties: message: type: string description: Human-readable error message example: Invalid input provided code: type: string description: Error code for programmatic handling example: VALIDATION_ERROR details: description: Additional error context required: - message additionalProperties: false example: code: INTERNAL_SERVER_ERROR message: INTERNAL_SERVER_ERROR statusCode: 500 components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: API Key description: To authenticate server-side requests ````