> ## Documentation Index > Fetch the complete documentation index at: https://docs.meum.io/llms.txt > Use this file to discover all available pages before exploring further. # Cancel invoice > Cancels an open invoice. Not available for WooCommerce dedicated keys. ## OpenAPI ````yaml /openapi.yaml post /v1/invoices/{id}/cancel openapi: 3.1.0 info: title: Meum Public Merchant API version: 1.0.0 description: > Public merchant API for programmatic payment management: invoices, transactions, payment links, webhooks, and WooCommerce integration. Authenticate with a store-scoped API key (`sk_live_*`) via Bearer token. Base URL: https://api.meum.io contact: name: Meum Support email: support@meum.io url: https://meum.io servers: - url: https://api.meum.io description: Production security: - bearerAuth: [] tags: - name: Health description: Service health checks - name: Invoices description: Invoice lifecycle - name: Transactions description: On-chain payment transactions - name: Payment Links description: Reusable payment link management - name: Webhooks description: Webhook endpoint and delivery management - name: Integrations description: Third-party platform integrations paths: /v1/invoices/{id}/cancel: post: tags: - Invoices summary: Cancel invoice description: Cancels an open invoice. Not available for WooCommerce dedicated keys. operationId: cancelInvoice parameters: - $ref: '#/components/parameters/InvoiceId' responses: '200': description: Invoice cancelled content: application/json: schema: $ref: '#/components/schemas/PublicInvoice' '400': $ref: '#/components/responses/BadRequest' '403': $ref: '#/components/responses/Forbidden' '404': $ref: '#/components/responses/NotFound' components: parameters: InvoiceId: name: id in: path required: true description: Invoice ID from create or list responses (starts with `inv_`). schema: type: string pattern: ^(inv_|txn_|plink_|wh_|whd_|evt_|int_)[0-9a-z]{20,32}$ schemas: PublicInvoice: type: object description: Full invoice record returned by list and get endpoints. properties: id: type: string pattern: ^(inv_|txn_|plink_|wh_|whd_|evt_|int_)[0-9a-z]{20,32}$ description: Unique invoice ID (`inv_...`). external_order_id: type: string description: Your order reference from when the invoice was created. example: order_demo_1048 status: $ref: '#/components/schemas/InvoiceStatus' amount: type: string description: Amount you requested to receive (decimal string, e.g. `"100.00"`). example: '100.00' currency: type: string description: Currency of `amount` (e.g. `USD`). example: USD order_amount: type: string description: Original order total before conversion, if different from `amount`. example: '100.00' order_currency: type: string description: Currency of `order_amount`. example: USD paid_amount: type: - string - 'null' description: How much the customer actually paid. `null` until payment starts. example: '100.00' output_asset: type: string description: Stablecoin paid out to you (e.g. `USDC`). example: USDC checkout_url: type: - string - 'null' format: uri description: >- Payment page URL while the invoice can still be paid. `null` if no longer payable. return_url: type: - string - 'null' format: uri description: >- Where the customer is redirected after checkout, if you set one at creation. customer_id: type: - string - 'null' format: uuid description: >- Internal customer record ID, if linked. Usually not needed for basic integrations. payment_link_id: type: - string - 'null' format: uuid description: Pay Link that created this invoice, if applicable. transaction_hash: type: - string - 'null' description: >- Blockchain transaction ID after payment is confirmed. `null` until paid. metadata: type: - object - 'null' additionalProperties: true description: Custom data you attached when creating the invoice. created_at: type: string format: date-time description: When the invoice was created (UTC). updated_at: type: string format: date-time description: When the invoice was last updated (UTC). paid_at: type: - string - 'null' format: date-time description: When payment was confirmed. `null` until the invoice is paid. expires_at: type: string format: date-time description: Deadline to pay before the invoice expires (UTC). InvoiceStatus: type: string description: | Where the invoice is in the payment flow: - `pending`: created, not yet ready for payment - `quoted`: price quote ready; customer can proceed to pay - `awaiting_payment`: waiting for the customer to send funds - `paid`: payment received and confirmed - `underpaid`: customer paid less than the requested amount - `expired`: not paid before the deadline - `failed`: payment or processing failed - `refunded`: payment was returned to the customer - `cancelled`: invoice was cancelled before completion enum: - pending - quoted - awaiting_payment - paid - underpaid - expired - failed - refunded - cancelled PublicApiError: type: object description: Standard error envelope for Public API v1 endpoints. required: - error properties: error: type: object description: Error details for the failed request. required: - type - code - message - request_id properties: type: type: string description: High-level error category used for programmatic handling. enum: - invalid_request - authentication_error - permission_error - not_found - conflict - rate_limit_error - api_error example: not_found code: type: string description: >- Stable machine-readable error code (for example `invoice_not_found`). example: invoice_not_found message: type: string description: Human-readable explanation suitable to show in logs or UI. example: Invoice not found param: type: string description: Request field associated with the error, when applicable. example: url request_id: type: string description: Unique request ID. Include when contacting support. example: req_a1b2c3d4e5f6789012345678 example: error: type: not_found code: invoice_not_found message: Invoice not found request_id: req_a1b2c3d4e5f6789012345678 responses: BadRequest: description: Invalid request content: application/json: schema: $ref: '#/components/schemas/PublicApiError' Forbidden: description: Insufficient scope or permission content: application/json: schema: $ref: '#/components/schemas/PublicApiError' NotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/PublicApiError' securitySchemes: bearerAuth: type: http scheme: bearer description: | Store-scoped API key. Prefix with `sk_live_`. Example: `Authorization: Bearer sk_live_EXAMPLE_DO_NOT_USE` ````