> ## 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. # Retrieve a Transaction Validation > Use this endpoint to retrieve a transaction validation record by its unique identifier. Useful for auditing and debugging validation decisions. ## OpenAPI ````yaml /en/openapi/v3-current/tracer.yaml get /v1/validations/{id} openapi: 3.1.0 info: title: Tracer API description: >- Complete API reference for Tracer services including transaction validation, rules management, spending limits, and audit events for SOX/GLBA compliance. version: 1.0.0 servers: - url: https://tracer.lerian.io security: - ApiKeyAuth: [] - BearerAuth: [] tags: - name: Health API description: >- Health check endpoints for liveness and readiness probes. These endpoints do not require authentication. - name: Validations API description: >- Transaction validation endpoints. Performance target is under 80ms (p99). Validations are idempotent by `requestId` — a duplicate request returns the cached result with HTTP 200, while a new request returns HTTP 201. No idempotency header is required. - name: Rules API description: >- Validation rule management endpoints. Rules use CEL (Common Expression Language) expressions. - name: Limits API description: >- Spending limit management endpoints. Limits control transaction amounts by scope and period. - name: Audit Events API description: >- Audit trail endpoints for SOX/GLBA compliance. All validation decisions and configuration changes are recorded. paths: /v1/validations/{id}: get: tags: - Validations API summary: Retrieve a Transaction Validation description: >- Use this endpoint to retrieve a transaction validation record by its unique identifier. Useful for auditing and debugging validation decisions. operationId: getValidation parameters: - $ref: '#/components/parameters/ValidationId' - $ref: '#/components/parameters/ContentType' - $ref: '#/components/parameters/XApiKey' - $ref: '#/components/parameters/XRequestId' responses: '200': description: >- Indicates that the request was successful and the response contains the expected data. content: application/json: schema: $ref: '#/components/schemas/TransactionValidation' '400': description: '' content: application/json: schema: $ref: '#/components/schemas/ErrorFormat' examples: Error0007: $ref: '#/components/examples/Error0007' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/ErrorFormat' examples: ErrorUnauthenticated: $ref: '#/components/examples/ErrorUnauthenticated' '404': description: '' content: application/json: schema: $ref: '#/components/schemas/ErrorFormat' examples: Error0251: $ref: '#/components/examples/Error0251' '500': description: Internal Server Error content: application/json: schema: $ref: '#/components/schemas/ErrorFormat' examples: Error0004: $ref: '#/components/examples/Error0004' components: parameters: ValidationId: name: id in: path description: >- The unique identifier of the transaction validation that you want to retrieve. required: true example: 019c96a0-10d2-7193-8841-0d7347efd09a schema: type: string format: uuid ContentType: name: Content-Type in: header description: The type of media of the resource. Must be `application/json`. required: true example: application/json schema: type: string XApiKey: name: X-API-Key in: header description: >- The API Key for authentication. **This header is required for all endpoints except health checks**. required: true schema: type: string XRequestId: name: X-Request-Id in: header description: A unique identifier used to trace and track each request. required: false example: 019c96a0-10ce-75fc-a273-dc799079a99c schema: type: string format: uuid schemas: TransactionValidation: type: object description: Full transaction validation record. properties: validationId: type: string format: uuid description: Server-generated unique identifier for this validation record. requestId: type: string format: uuid description: Client-provided request identifier for correlation. transactionType: type: string enum: - CARD - WIRE - PIX - CRYPTO description: Type of transaction (payment method). subType: type: string description: Transaction subtype for additional context. amount: type: string description: Transaction amount as a decimal string (e.g., "1500.00"). currency: type: string description: ISO 4217 currency code. transactionTimestamp: type: string format: date-time description: When the transaction occurred. decision: type: string enum: - ALLOW - DENY - REVIEW description: Validation decision. reason: type: string description: Human-readable reason for the decision. account: $ref: '#/components/schemas/AccountContext' segment: $ref: '#/components/schemas/SegmentContext' portfolio: $ref: '#/components/schemas/PortfolioContext' merchant: $ref: '#/components/schemas/MerchantContext' metadata: type: object additionalProperties: true description: Custom key-value pairs provided in the request. matchedRuleIds: type: array items: type: string format: uuid description: IDs of rules that matched and triggered the decision. evaluatedRuleIds: type: array items: type: string format: uuid description: IDs of all rules that were evaluated. limitUsageDetails: type: array items: $ref: '#/components/schemas/LimitUsageDetail' description: Details about each limit checked during validation. processingTimeMs: type: number format: double description: Processing time in milliseconds. totalRulesLoaded: type: integer description: Total number of rules loaded for evaluation. truncated: type: boolean description: Whether the response was truncated due to size limits. createdAt: type: string format: date-time description: When the validation record was created. ErrorFormat: type: object description: The response message error. required: - code - title - message properties: code: type: string description: A unique, stable identifier for the error. title: type: string description: A brief summary of the issue. message: type: string description: Detailed guidance for resolving the error. fields: type: object additionalProperties: true description: Additional information about the fields that caused the error. AccountContext: type: object description: Account context for validation. required: - accountId properties: accountId: type: string format: uuid description: Account identifier (required). type: type: string description: Account type. enum: - checking - savings - credit status: type: string description: Account status. enum: - active - suspended - closed metadata: type: object additionalProperties: true description: Additional account attributes for rule evaluation. SegmentContext: type: object description: Segment context (optional). If provided, segmentId is required. properties: segmentId: type: string format: uuid description: Segment identifier (required if segment object provided). name: type: string description: Segment name for rule expressions. metadata: type: object additionalProperties: true description: Additional segment attributes for rule evaluation. PortfolioContext: type: object description: Portfolio context (optional). If provided, portfolioId is required. properties: portfolioId: type: string format: uuid description: Portfolio identifier (required if portfolio object provided). name: type: string description: Portfolio name for rule expressions. metadata: type: object additionalProperties: true description: Additional portfolio attributes for rule evaluation. MerchantContext: type: object description: >- Merchant context (optional, recommended for card transactions). If provided, merchantId is required. properties: merchantId: type: string format: uuid description: Merchant identifier (required if merchant object provided). name: type: string description: Merchant name. category: type: string description: Merchant Category Code (MCC). Must be a 4-digit code per ISO 18245. pattern: ^[0-9]{4}$ country: type: string description: >- Merchant country. Must be ISO 3166-1 alpha-2 code (2 uppercase letters). pattern: ^[A-Z]{2}$ metadata: type: object additionalProperties: true description: Additional merchant attributes for rule evaluation. LimitUsageDetail: type: object description: Details about a limit check during validation. properties: limitId: type: string format: uuid description: The limit that was checked. limitAmount: type: string description: Total limit amount as a decimal string (e.g., "50000.00"). currentUsage: type: string description: >- Projected usage after applying transaction, as a decimal string. When exceeded, shows what usage would have been if allowed. exceeded: type: boolean description: >- Whether the limit was exceeded. When true, the counter was not incremented. period: type: string description: Limit period type. enum: - DAILY - WEEKLY - MONTHLY - CUSTOM - PER_TRANSACTION scope: type: string description: >- Human-readable scope (e.g., "account:uuid", "segment:uuid", or "global"). attemptedAmount: type: string description: Transaction amount being validated, as a decimal string. skipped: type: boolean description: >- Whether this limit was skipped during evaluation (not enforced). When true, the counter was not incremented and `exceeded` is always false. Omitted when false. skipReason: type: string enum: - outside_time_window - outside_custom_period description: Reason the limit was skipped. Only present when `skipped` is true. examples: Error0007: summary: Invalid Path Parameter value: code: TRC-0007 title: Invalid Path Parameter message: >- The provided ID is not a valid UUID format. Please verify the ID and try again. ErrorUnauthenticated: summary: Unauthorized value: code: Unauthenticated title: Unauthorized message: >- API Key missing or invalid. Provide a valid API Key in the X-API-Key header. Error0251: summary: Transaction Validation Not Found value: code: TRC-0251 title: Transaction Validation Not Found message: >- The requested transaction validation does not exist. Please verify the validation ID and try again. Error0004: summary: Internal Server Error value: code: TRC-0004 title: Internal Server Error message: >- An unexpected error occurred. Please try again later or contact support if the issue persists. securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: >- API Key authentication. Used by single-tenant deployments (`MULTI_TENANT_ENABLED=false`). Sent on every `/v1/*` request. BearerAuth: type: http scheme: bearer bearerFormat: JWT description: >- JWT bearer authentication. Used by multi-tenant deployments (`MULTI_TENANT_ENABLED=true`). The JWT is issued by Access Manager and must carry the `tenantId` claim — Tracer resolves the tenant from the token, not from any header or body field. ````