> ## Documentation Index > Fetch the complete documentation index at: https://docs.lerian.studio/llms.txt > Use this file to discover all available pages before exploring further. # Process exception callback > Use this endpoint to process a callback from an external system for a dispatched exception. This updates the exception status based on the external system resolution. ## OpenAPI ````yaml /pt/openapi/v3-current/matcher.yaml post /v1/exceptions/{exceptionId}/callback openapi: 3.1.0 info: title: Matcher APIs description: >- Complete API reference for the Matcher reconciliation engine, providing automated transaction matching between Midaz Ledger and external systems. version: 5.0.4 license: name: Lerian Studio General License servers: - url: https://matcher.sandbox.lerian.net security: [] paths: /v1/exceptions/{exceptionId}/callback: post: tags: - Exception summary: Process exception callback description: >- Use this endpoint to process a callback from an external system for a dispatched exception. This updates the exception status based on the external system resolution. operationId: processCallback parameters: - description: The unique identifier of the exception. in: path name: exceptionId required: true schema: description: Exception ID (UUID) examples: - 550e8400-e29b-41d4-a716-446655440000 format: uuid type: string - description: Opaque bearer token authenticating the external system in: header name: X-Callback-Token required: true schema: description: Opaque bearer token authenticating the external system type: string - description: Idempotency key for deduplication in: header name: X-Idempotency required: true schema: description: Idempotency key for deduplication type: string requestBody: content: application/json: schema: $ref: '#/components/schemas/ProcessCallbackRequest' description: Callback payload from external system required: true responses: '200': description: Callback processed successfully. content: application/json: schema: $ref: '#/components/schemas/ProcessCallbackResponse' '400': description: The request contains invalid parameters or payload. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: 400-invalid-dueat-format-expected-rfc3339: $ref: >- #/components/examples/400-invalid-dueat-format-expected-rfc3339 '404': description: >- The callback token is not recognized, or the exception does not exist. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: 404-not-found: $ref: '#/components/examples/404-not-found' mtch-0501-exception-not-found: $ref: '#/components/examples/mtch-0501-exception-not-found' '409': description: The request conflicts with the current state of the resource. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: mtch-0504-callback-is-already-being-processed: $ref: >- #/components/examples/mtch-0504-callback-is-already-being-processed mtch-0505-callback-can-be-retried: $ref: '#/components/examples/mtch-0505-callback-can-be-retried' '422': $ref: '#/components/responses/ValidationFailed' '429': description: >- The external system sent more callbacks for the tenant in the current minute than the limit allows. Wait, then retry. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: mtch-0506-callback-rate-limit-exceeded: $ref: '#/components/examples/mtch-0506-callback-rate-limit-exceeded' '500': $ref: '#/components/responses/InternalServerError' '503': description: The service is temporarily unavailable. Please try again later. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: 503-internal-error: $ref: '#/components/examples/503-internal-error' security: - CallbackToken: [] components: schemas: ProcessCallbackRequest: additionalProperties: false properties: assignee: description: Assignee identifier (required when status is ASSIGNED) examples: - user@example.com type: string callbackType: description: Type of callback (e.g. status_update, assignment) examples: - status_update type: string dueAt: description: Due date for resolution as an RFC 3339 timestamp examples: - '2025-01-20T10:30:00Z' type: - string - 'null' externalIssueId: description: Issue ID in the external system examples: - RECON-1234 minLength: 1 type: string externalSystem: description: External system identifier (e.g. JIRA, SERVICENOW, WEBHOOK) examples: - JIRA minLength: 1 type: string payload: additionalProperties: {} description: Arbitrary payload from the external system type: object resolutionNotes: description: Optional resolution notes examples: - Resolved by external agent type: string status: description: Target status for the exception (e.g. ASSIGNED, RESOLVED) examples: - RESOLVED minLength: 1 type: string updatedAt: description: External system timestamp as an RFC 3339 timestamp examples: - '2025-01-15T10:30:00Z' type: - string - 'null' required: - callbackType - externalSystem - externalIssueId - status - resolutionNotes - assignee - dueAt - updatedAt - payload type: object ProcessCallbackResponse: additionalProperties: false properties: status: description: >- Processing status of the callback (the handler always returns "accepted" on success) examples: - accepted type: string required: - status type: object Detail: additionalProperties: false properties: code: description: >- Stable, machine-readable domain error code scoped to the emitting service (format: -NNNN). examples: - ERR-0001 type: string detail: description: >- A human-readable explanation specific to this occurrence of the problem. examples: - Property foo is required but is missing. type: string errors: description: Optional list of individual error details items: $ref: '#/components/schemas/ErrorDetail' type: - array - 'null' instance: description: >- A URI reference that identifies the specific occurrence of the problem. examples: - https://example.com/error-log/abc123 format: uri type: string status: description: HTTP status code examples: - 400 format: int64 type: integer title: description: >- A short, human-readable summary of the problem type. This value should not change between occurrences of the error. examples: - Bad Request type: string type: default: about:blank description: A URI reference to human-readable documentation for the error. examples: - https://example.com/errors/example format: uri type: string upstream: $ref: '#/components/schemas/Upstream' description: >- RFC 9457 extension member: the error a proxied third-party provider reported. Absent unless the emitting service explicitly surfaced one. type: object ErrorDetail: additionalProperties: false properties: location: description: >- Where the error occurred, e.g. 'body.items[3].tags' or 'path.thing-id' type: string message: description: Error message text type: string value: description: The value at the given location type: object Upstream: additionalProperties: false properties: code: description: The upstream provider's own error code, verbatim. examples: - E4001 type: string message: description: >- The upstream provider's own error message, verbatim (bounded, never its raw response body). examples: - account not found at provider type: string type: object examples: 400-invalid-dueat-format-expected-rfc3339: summary: Invalid dueAt format, expected RFC3339 value: title: Bad Request status: 400 detail: invalid dueAt format, expected RFC3339 404-not-found: summary: Not found value: type: https://errors.lerian.studio/v1/MTCH-0005 title: Not Found status: 404 detail: >- This callback token is not valid; ask an administrator to check the callback credential configured for this integration code: MTCH-0005 mtch-0501-exception-not-found: summary: Exception not found value: type: https://errors.lerian.studio/v1/MTCH-0501 title: Not Found status: 404 detail: No exception matches this id. Check the exception id and try again. code: MTCH-0501 mtch-0504-callback-is-already-being-processed: summary: Callback is already being processed value: type: https://errors.lerian.studio/v1/MTCH-0504 title: Conflict status: 409 detail: >- Another callback for this idempotency key is still being processed; this attempt was not processed. Retry the request in a moment; if it keeps failing, contact support. code: MTCH-0504 mtch-0505-callback-can-be-retried: summary: Callback can be retried value: type: https://errors.lerian.studio/v1/MTCH-0505 title: Conflict status: 409 detail: >- The callback's processing status could not be confirmed; this attempt was not processed. Retry the request in a moment; if it keeps failing, contact support. code: MTCH-0505 mtch-0506-callback-rate-limit-exceeded: summary: Callback rate limit exceeded value: type: https://errors.lerian.studio/v1/MTCH-0506 title: Too Many Requests status: 429 detail: >- This external system has exceeded its callback rate limit; this callback was not processed. Retry the request in a moment; if it keeps failing, contact support. code: MTCH-0506 503-internal-error: summary: Service Unavailable value: title: Service Unavailable status: 503 detail: internal error responses: ValidationFailed: description: >- The request failed validation. The `errors` list names each value that failed. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' example: title: Unprocessable Entity status: 422 detail: validation failed errors: - message: expected required property name to be present location: body InternalServerError: description: An unexpected error occurred on the server. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' example: type: https://errors.lerian.studio/v1/MTCH-0002 title: Internal Server Error status: 500 detail: internal error code: MTCH-0002 text/plain: schema: type: string example: Internal Server Error securitySchemes: CallbackToken: description: >- Opaque bearer token authenticating an external system's inbound exception callback. in: header name: X-Callback-Token type: apiKey ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.