> ## Documentation Index > Fetch the complete documentation index at: https://docs.kukkingu.software/llms.txt > Use this file to discover all available pages before exploring further. # Update invoice > Updates an existing invoice by its ID. - Invoices in DRAFT status can be updated without restrictions. - Invoices in VOID status cannot be updated. - Invoices in FINALIZED status can only have the following fields updated: paidAt. All other fields are locked for updates. ## OpenAPI ````yaml https://api.contracting.kukkingu.software/api/v1/docs.json put /api/v1/invoices/{invoiceId} openapi: 3.1.0 info: title: Contracting Backend API version: 0.1.0 description: API documentation for the Contracting backend service. servers: - url: https://api.contracting.kukkingu.software description: API server security: - bearerAuth: [] paths: /api/v1/invoices/{invoiceId}: put: tags: - Invoices summary: Update invoice description: >- Updates an existing invoice by its ID. - Invoices in DRAFT status can be updated without restrictions. - Invoices in VOID status cannot be updated. - Invoices in FINALIZED status can only have the following fields updated: paidAt. All other fields are locked for updates. parameters: - schema: type: string description: The ID of the invoice. examples: - inv_mqxd1kc6bgtcc676xoqzax47 in: path name: invoiceId required: true description: The ID of the invoice. - schema: type: string example: tnt_pfh0haxfpzowht3oi213cqos description: >- Specifies the tenant context for the request. All endpoints operate within this tenant scope. in: header name: tenant-id required: true description: >- Specifies the tenant context for the request. All endpoints operate within this tenant scope. requestBody: required: true content: application/json: schema: type: object properties: invoiceNumber: type: string minLength: 1 maxLength: 255 description: Unique invoice number. example: INV-2025-0001 exchangeRate: type: number minimum: 0 description: Exchange rate applied when currency conversion is needed. example: 1.12 currencyCode: type: string minLength: 3 maxLength: 3 description: ISO 4217 currency code. example: EUR amountMinor: type: integer minimum: 0 maximum: 9007199254740991 description: Amount expressed in the minor unit (e.g., cents). example: 5000 issuedAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice was issued. example: '2023-10-05T14:48:00.000Z' - type: 'null' dueAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice is due. example: '2023-10-05T14:48:00.000Z' - type: 'null' paidAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice was paid. example: '2023-10-05T14:48:00.000Z' - type: 'null' required: - invoiceNumber - exchangeRate - currencyCode - amountMinor additionalProperties: false description: >- Request body used to fully replace an existing invoice resource. Status-based update restrictions are validated server-side against the current invoice status. description: >- Request body used to fully replace an existing invoice resource. Status-based update restrictions are validated server-side against the current invoice status. responses: '200': description: Default Response content: application/json: schema: type: object properties: data: type: object properties: id: type: string description: The ID of the invoice. examples: - inv_mqxd1kc6bgtcc676xoqzax47 contract: anyOf: - type: string description: The ID of the contract. example: ctr_z23aoo8naxk68ewcr64tchh5 - type: object properties: id: type: string description: The ID of the contract. example: ctr_z23aoo8naxk68ewcr64tchh5 client: anyOf: - type: string description: Unique identifier of the client. example: clnt_z2b3mo8qa5kzptgsu26q2wmh - type: object properties: id: type: string description: Unique identifier of the client. example: clnt_z2b3mo8qa5kzptgsu26q2wmh name: type: string minLength: 1 maxLength: 255 description: The name of the client. example: Acme Corporation description: type: string maxLength: 1024 description: >- Additional information describing the client. example: >- A leading provider of road runner deterrents. order: type: integer minimum: 0 maximum: 9007199254740991 description: >- Order of the resource for sorting purposes. example: 13 createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Timestamp when the client was created. example: '2023-10-05T14:48:00.000Z' updatedAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: >- Timestamp when the client was last updated. example: '2023-10-05T14:48:00.000Z' required: - id - name - createdAt - updatedAt additionalProperties: false description: Client resource returned by the API. description: >- Expandable Client field represented either as an ID or a fully expanded object. name: type: string minLength: 1 maxLength: 255 description: Contract name. example: Standard Service Contract description: type: string description: Detailed contract description. example: >- This contract covers standard service terms and conditions. amountMinor: type: integer minimum: 0 maximum: 9007199254740991 description: Monetary amount in minor units (e.g., cents). example: 5000 currencyCode: type: string minLength: 3 maxLength: 3 description: ISO 4217 currency code. example: EUR order: type: integer minimum: 0 maximum: 9007199254740991 description: Order of the resource for sorting purposes. example: 13 validFrom: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Contract validity start date. example: '2023-10-05T14:48:00.000Z' validTo: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Contract validity end date. example: '2023-10-05T14:48:00.000Z' createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Timestamp when the contract was created. example: '2023-10-05T14:48:00.000Z' updatedAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Timestamp when the contract was last updated. example: '2023-10-05T14:48:00.000Z' required: - id - client - name - amountMinor - currencyCode - createdAt - updatedAt additionalProperties: false description: Contract resource returned by the API. description: >- Expandable Contract field represented either as an ID or a fully expanded object. status: type: string enum: - DRAFT - FINALIZED - VOID description: Status of the invoice. example: FINALIZED invoiceNumber: type: string minLength: 1 maxLength: 255 description: Unique invoice number. example: INV-2025-0001 exchangeRate: type: number minimum: 0 description: >- Exchange rate applied when currency conversion is needed. example: 1.12 currencyCode: type: string minLength: 3 maxLength: 3 description: ISO 4217 currency code. example: EUR amountMinor: type: integer minimum: 0 maximum: 9007199254740991 description: Amount expressed in the minor unit (e.g., cents). example: 5000 issuedAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice was issued. example: '2023-10-05T14:48:00.000Z' - type: 'null' dueAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice is due. example: '2023-10-05T14:48:00.000Z' - type: 'null' paidAt: anyOf: - type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: When the invoice was paid. example: '2023-10-05T14:48:00.000Z' - type: 'null' createdAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Timestamp when the invoice was created. example: '2023-10-05T14:48:00.000Z' updatedAt: type: string format: date-time pattern: >- ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d(?::[0-5]\d(?:\.\d+)?)?(?:Z))$ description: Timestamp when the invoice was last updated. example: '2023-10-05T14:48:00.000Z' required: - id - contract - status - invoiceNumber - exchangeRate - currencyCode - amountMinor - createdAt - updatedAt additionalProperties: false description: Invoice resource returned by the API. required: - data additionalProperties: false description: Standard success response payload wrapped in a data property. '400': description: Default Response content: application/json: schema: type: object properties: error: type: string description: Machine-readable error code. example: ValidationError message: type: string description: Human-readable validation error summary. details: type: array items: type: object properties: field: type: string description: Request field that failed validation. message: type: string description: Validation failure message for the field. constraint: type: string description: Validation rule that was violated. required: - field - message - constraint additionalProperties: false required: - error - message additionalProperties: false description: Error response returned when request validation fails. '401': description: Default Response content: application/json: schema: type: object properties: error: default: Unauthorized description: Machine-readable error code. example: Unauthorized type: string message: default: Unauthorized description: Human-readable error message. example: Unauthorized type: string required: - error - message additionalProperties: false description: Error response for requests without valid authentication. '403': description: Default Response content: application/json: schema: type: object properties: error: default: Forbidden description: Machine-readable error code. example: Forbidden type: string message: default: Forbidden description: Human-readable error message. example: Forbidden type: string required: - error - message additionalProperties: false description: Error response for requests blocked by authorization rules. '404': description: Default Response content: application/json: schema: type: object properties: error: default: NotFound description: Machine-readable error code. example: NotFound type: string message: default: Not Found description: Human-readable error message. example: Not Found type: string required: - error - message additionalProperties: false description: Error response when the requested resource does not exist. components: securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT ````