> ## 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. # Break/Unmatch a match group > Use this endpoint to break an incorrect match group. Send the reason in the request. The transactions of the group return to UNMATCHED status. When you reject a PROPOSED group, a transaction that was force-matched separately stays MATCHED. If a manual or automatic match closed an exception, the exception is re-stamped UNMATCH_WITHDRAWN and the next break on its transaction reopens it. ## OpenAPI ````yaml /pt/openapi/v3-current/matcher.yaml delete /v1/matching/groups/{matchGroupId} 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: 6.1.0 license: name: Lerian Studio General License servers: - url: https://matcher.sandbox.lerian.net security: [] paths: /v1/matching/groups/{matchGroupId}: delete: tags: - Matching summary: Break/Unmatch a match group description: >- Use this endpoint to break an incorrect match group. Send the reason in the request. The transactions of the group return to UNMATCHED status. When you reject a PROPOSED group, a transaction that was force-matched separately stays MATCHED. If a manual or automatic match closed an exception, the exception is re-stamped UNMATCH_WITHDRAWN and the next break on its transaction reopens it. operationId: unmatch parameters: - description: A unique identifier for tracing the request across services. in: header name: X-Request-Id schema: type: string - description: Match Group ID in: path name: matchGroupId required: true schema: description: Match Group ID format: uuid type: string - description: Context ID explode: false in: query name: contextId required: true schema: description: Context ID the group belongs to format: uuid type: string - $ref: '#/components/parameters/XIdempotency' requestBody: content: application/json: schema: $ref: '#/components/schemas/UnmatchRequest' description: Unmatch payload with rejection reason required: true responses: '204': description: >- Indicates that the operation was successful with no content to return. '400': description: The request contains invalid parameters or payload. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: 400-reason-is-required: $ref: '#/components/examples/400-reason-is-required' '401': $ref: '#/components/responses/Unauthorized' '403': description: >- You do not have permission to access this resource, or the context is not active. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: TenantClaimRequired: summary: Tenant claim missing value: type: https://errors.lerian.studio/v1/MTCH-0004 title: Forbidden status: 403 detail: tenant claim required code: MTCH-0004 mtch-0012-context-is-not-active: $ref: '#/components/examples/mtch-0012-context-is-not-active' '404': description: The requested resource was not found. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: mtch-0005-context-not-found: $ref: '#/components/examples/mtch-0005-context-not-found' mtch-0005-match-group-not-found: $ref: '#/components/examples/mtch-0005-match-group-not-found' '409': description: >- 409 `MTCH-0007`: this un-match was not applied, for example because the group was already rejected or revoked. With an `X-Idempotency` key, 409 `MTCH-0018` means a request with the same key is still running, and 409 `MTCH-0022` means an earlier attempt under the key already ran and its answer cannot be replayed: check the outcome before retrying. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' '422': $ref: '#/components/responses/ValidationFailed' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' security: - BearerAuth: [] components: parameters: XIdempotency: name: X-Idempotency in: header required: false description: >- Optional idempotency key for safe retries. Matcher reads the key only from this header, and only when you send one. A request that carries a key only in `X-Idempotency-Key` or `Idempotency-Key` is refused with `400` (`MTCH-0015`), and nothing is processed. If the same key is sent again and the original request was already processed, the stored response is returned with `X-Idempotency-Replayed: true`. A malformed key returns `400`, a key whose first request is still in progress returns `409` (`MTCH-0018`), a key whose earlier attempt already ran but whose answer cannot be replayed returns `409` (`MTCH-0022`), and an idempotency storage failure returns `500`. POST, PUT, PATCH and DELETE requests accept the header. These refusals are problem documents. schema: type: string schemas: UnmatchRequest: additionalProperties: false properties: reason: description: Reason the match group is being broken examples: - incorrect match - amounts do not match minLength: 1 type: string required: - reason 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 RateLimitErrorResponse: description: >- Flat body that the rate limiter returns. `code` is the HTTP status as a number. type: object required: - code - title - message properties: code: type: integer description: HTTP status code. example: 429 title: type: string description: Error type. example: rate_limit_exceeded message: type: string description: Human-readable error message. example: rate limit exceeded examples: 400-reason-is-required: summary: Reason is required value: title: Bad Request status: 400 detail: reason is required mtch-0012-context-is-not-active: summary: Context is not active value: type: https://errors.lerian.studio/v1/MTCH-0012 title: Forbidden status: 403 detail: context is not active code: MTCH-0012 mtch-0005-context-not-found: summary: Context not found value: type: https://errors.lerian.studio/v1/MTCH-0005 title: Not Found status: 404 detail: >- No reconciliation context matches this id; check the context id and try again. code: MTCH-0005 mtch-0005-match-group-not-found: summary: Match group not found value: type: https://errors.lerian.studio/v1/MTCH-0005 title: Not Found status: 404 detail: >- The match group could not be found; this un-match was not applied. Check the match group id and try again. code: MTCH-0005 responses: Unauthorized: description: The request lacks valid authentication credentials. content: application/problem+json: schema: $ref: '#/components/schemas/Detail' examples: MissingToken: summary: Missing token value: type: https://errors.lerian.studio/v1/AUT-0006 title: Token Missing status: 401 detail: >- A valid token must be provided in the request header. Please include a token and try again. code: AUT-0006 InvalidToken: summary: Invalid token value: type: https://errors.lerian.studio/v1/AUT-0007 title: Invalid Token status: 401 detail: >- The provided token is expired, invalid or malformed. Please provide a valid token and try again. code: AUT-0007 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 TooManyRequests: description: >- The request exceeded the rate limit. Wait the number of seconds in `Retry-After`, then retry. headers: Retry-After: $ref: '#/components/headers/RetryAfter' X-RateLimit-Limit: $ref: '#/components/headers/XRateLimitLimit' X-RateLimit-Remaining: $ref: '#/components/headers/XRateLimitRemaining' X-RateLimit-Reset: $ref: '#/components/headers/XRateLimitReset' content: application/json: schema: $ref: '#/components/schemas/RateLimitErrorResponse' example: code: 429 title: rate_limit_exceeded message: rate limit exceeded 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 headers: RetryAfter: description: Seconds to wait before you retry. schema: type: integer example: 30 XRateLimitLimit: description: Requests allowed in the current window. schema: type: integer example: 100 XRateLimitRemaining: description: Requests left in the current window. Always `0` on a `429`. schema: type: integer example: 0 XRateLimitReset: description: Unix time, in seconds, when the current window resets. schema: type: integer example: 1767225600 securitySchemes: BearerAuth: bearerFormat: JWT description: 'Bearer token authentication (format: "Bearer {token}")' scheme: bearer type: http ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.