> ## Documentation Index > Fetch the complete documentation index at: https://docs.aiinsurance.io/llms.txt > Use this file to discover all available pages before exploring further. # Reinstate Policy Transaction > Reinstates a previously cancelled policy as of a given date via a REINSTATE transaction. The policy must be Cancelled at the reinstatement date. The action sets `policyStatus` back to `active` from the reinstatement date through the end of the policy term and clears the `policyEarlyTerminationDate` on `fullTermPolicyInfo`. Optional `fullTermDeltas` allow adjusting `fullTermPolicyBilling` fields (e.g. reinstatement fees). Only `fullTermPolicyBilling`-prefixed paths are accepted — per-segment data and policy dates are not modifiable via reinstate. Dates are not accepted on these deltas because they always span the full policy term; the server injects them. **Required permission:** `company.policy:update` ## OpenAPI ````yaml /openapi/generated-external-api.yaml post /api/v1/external/companies/{companyId}/policies/{policyId}/transaction/reinstate openapi: 3.0.3 info: title: AI Insurance External API description: External API for AI Insurance platform version: 1.0.0 contact: email: support@aiinsurance.io servers: - url: https://app.aiinsurance.io description: Production security: - ApiKeyAuth: [] paths: /api/v1/external/companies/{companyId}/policies/{policyId}/transaction/reinstate: post: tags: - Field Model Policy Transactions summary: Reinstate Policy Transaction description: > Reinstates a previously cancelled policy as of a given date via a REINSTATE transaction. The policy must be Cancelled at the reinstatement date. The action sets `policyStatus` back to `active` from the reinstatement date through the end of the policy term and clears the `policyEarlyTerminationDate` on `fullTermPolicyInfo`. Optional `fullTermDeltas` allow adjusting `fullTermPolicyBilling` fields (e.g. reinstatement fees). Only `fullTermPolicyBilling`-prefixed paths are accepted — per-segment data and policy dates are not modifiable via reinstate. Dates are not accepted on these deltas because they always span the full policy term; the server injects them. **Required permission:** `company.policy:update` operationId: reinstatePolicyTransaction parameters: - $ref: '#/components/parameters/companyId' - $ref: '#/components/parameters/policyIdPath' requestBody: required: true content: application/json: schema: type: object required: - reinstatementDate properties: reinstatementDate: type: string format: date description: > The date the reinstatement takes effect in ISO 8601 format. Must fall within the policy term, and the policy must be Cancelled at this date. transactionTimestamp: type: string format: date-time description: > When the business decision was made. Defaults to the current time if omitted. Set explicitly for imports (e.g., aligning to a bordereau booking date). fullTermDeltas: type: array description: > Optional billing-only deltas. Each delta specifies a `fullTermPolicyBilling` path and a new value. These are applied as Overwrite actions across the full policy term (since `fullTermPolicyBilling` is a cross-segment invariant that must be identical in every segment). Note: `policyPremium` must remain equal to the pre-cancel premium (within 0.01 tolerance). Fees, taxes, and grand total may be adjusted freely. items: type: object required: - path - value properties: path: type: string description: | Path within `fullTermPolicyBilling` (e.g. `policy.fullTermPolicyBilling.reinstatementFee`). value: description: The new value to set at the path. examples: simpleReinstatement: summary: Reinstate cancelled policy value: reinstatementDate: '2025-07-01' reinstatementWithFees: summary: Reinstate with reinstatement fee value: reinstatementDate: '2025-07-01' fullTermDeltas: - path: policy.fullTermPolicyBilling.reinstatementFee value: 1500 - path: policy.fullTermPolicyBilling.policyGrandTotal value: 87000 reinstatementWithTimestamp: summary: Reinstate with explicit transaction timestamp value: reinstatementDate: '2025-07-01' transactionTimestamp: '2025-06-30T12:00:00Z' responses: '201': description: Policy reinstated successfully content: application/json: schema: $ref: '#/components/schemas/PolicyTransactionVersionResponse' examples: success: summary: Reinstatement transaction response value: policyId: 550e8400-e29b-41d4-a716-446655440001 policyVersion: 3 transactionId: 550e8400-e29b-41d4-a716-446655440050 startDate: '2025-01-01' endDate: '2025-12-31' createdAt: '2025-07-01T10:30:00.000Z' fullTermPolicyInfo: policyStatus: active policyStartDate: year: 2025 month: 1 day: 1 timezone: America/New_York policyEndDate: year: 2025 month: 12 day: 31 timezone: America/New_York primaryInsuredId: 550e8400-e29b-41d4-a716-446655440010 fullTermPolicyBilling: policyPremium: 85000 policyTaxes: 0 policyFees: 500 policyGrandTotal: 85500 segments: - startDate: '2025-01-01' endDate: '2025-06-14' fieldModelV1Data: policy: policyStatus: active annualPremium: 85000 fullTermPolicyInfo: policyStatus: active policyStartDate: year: 2025 month: 1 day: 1 timezone: America/New_York policyEndDate: year: 2025 month: 12 day: 31 timezone: America/New_York primaryInsuredId: 550e8400-e29b-41d4-a716-446655440010 fullTermPolicyBilling: policyPremium: 85000 policyTaxes: 0 policyFees: 500 policyGrandTotal: 85500 - startDate: '2025-06-15' endDate: '2025-06-30' fieldModelV1Data: policy: policyStatus: cancelled annualPremium: 85000 fullTermPolicyInfo: policyStatus: active policyStartDate: year: 2025 month: 1 day: 1 timezone: America/New_York policyEndDate: year: 2025 month: 12 day: 31 timezone: America/New_York primaryInsuredId: 550e8400-e29b-41d4-a716-446655440010 fullTermPolicyBilling: policyPremium: 85000 policyTaxes: 0 policyFees: 500 policyGrandTotal: 85500 - startDate: '2025-07-01' endDate: '2025-12-31' fieldModelV1Data: policy: policyStatus: active annualPremium: 85000 fullTermPolicyInfo: policyStatus: active policyStartDate: year: 2025 month: 1 day: 1 timezone: America/New_York policyEndDate: year: 2025 month: 12 day: 31 timezone: America/New_York primaryInsuredId: 550e8400-e29b-41d4-a716-446655440010 fullTermPolicyBilling: policyPremium: 85000 policyTaxes: 0 policyFees: 500 policyGrandTotal: 85500 '400': description: Validation error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: noExistingVersion: summary: Policy has no NEW_BUSINESS transaction value: error: code: InvalidRequest message: >- Policy has no existing version — NEW_BUSINESS must be created first dateOutsidePolicyPeriod: summary: Reinstatement date outside policy term value: error: code: InvalidRequest message: >- Reinstatement date 2026-03-01 falls outside policy period [2025-01-01, 2025-12-31] policyNotCancelled: summary: Policy is not Cancelled at reinstatement date value: error: code: InvalidRequest message: >- Policy must be Cancelled at reinstatement date 2025-07-01 — current status is "active" invalidDeltaPath: summary: fullTermDeltas path not targeting fullTermPolicyBilling value: error: code: InvalidDelta message: >- Invalid fullTermDeltas path "policy.annualPremium" — must target policy.fullTermPolicyBilling missingPremium: summary: Reinstate transaction missing required premium value: error: code: InvalidRequest message: >- Reinstate transaction must specify a premium (policy.fullTermPolicyBilling.policyPremium) premiumMismatch: summary: Reinstate premium does not match pre-cancel premium value: error: code: InvalidRequest message: >- Reinstate premium (90000) must equal pre-cancel premium (85000). '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/Forbidden' '404': description: Policy not found content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: policyNotFound: summary: Policy does not exist value: error: code: NOT_FOUND message: Policy 550e8400-e29b-41d4-a716-446655440099 not found '500': $ref: '#/components/responses/InternalServerError' components: parameters: companyId: name: companyId in: path required: true schema: type: string format: uuid description: Company identifier policyIdPath: name: policyId in: path required: true schema: type: string format: uuid description: Policy identifier schemas: PolicyTransactionVersionResponse: type: object description: > Response returned by policy transaction endpoints. Contains the policy version produced by the transaction, including all derived segments. required: - policyId - policyVersion - transactionId - startDate - endDate - createdAt - segments properties: policyId: type: string format: uuid description: Policy identifier policyVersion: type: integer description: Sequential version number produced by this transaction transactionId: type: string format: uuid description: Identifier of the transaction that produced this version startDate: type: string format: date description: Policy term start date (ISO 8601) endDate: type: string format: date description: Policy term end date (ISO 8601) createdAt: type: string format: date-time description: When the transaction was created (ISO 8601) fullTermPolicyInfo: type: object nullable: true description: > Full-term policy information. Contains policy status, term dates, and primary insured reference. additionalProperties: true fullTermPolicyBilling: type: object nullable: true description: > Full-term billing aggregates. Contains premium, taxes, fees, and grand total for the full policy term. additionalProperties: true segments: type: array description: > Derived segments for this policy version. Each segment represents a maximal contiguous date range where policy state is identical. Adjacent segments with identical data are automatically merged. items: $ref: '#/components/schemas/PolicyTransactionSegmentResponse' ErrorResponse: type: object description: Standard error response for all external API endpoints required: - error properties: error: type: object required: - code - message properties: code: type: string description: Machine-readable error code example: VALIDATION_ERROR message: type: string description: Human-readable error message example: 'submissionId: Required field is missing' details: type: array description: Additional details for validation errors (field-level errors) items: type: object properties: field: type: string description: The field that caused the error example: submissionId message: type: string description: Description of the field error example: Required field is missing PolicyTransactionSegmentResponse: type: object description: > A derived policy segment representing a date range where policy state is identical. Contains the full policy data (policy-level fields and nested exposures) for this period. required: - startDate - endDate - fieldModelV1Data properties: startDate: type: string format: date description: Segment start date (ISO 8601) endDate: type: string format: date description: Segment end date (ISO 8601) fieldModelV1Data: type: object description: > Policy state for this segment. Contains a `policy` key with policy-level fields and a nested `exposures` array. properties: policy: type: object description: Policy-level fields and nested exposures for this segment. additionalProperties: true additionalProperties: true responses: Unauthorized: description: Unauthorized - Invalid or missing API key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: missingApiKey: summary: Missing API key value: error: code: UNAUTHORIZED message: Authorization header is required bearerTokenNotAllowed: summary: Bearer token used instead of API key value: error: code: UNAUTHORIZED message: External API endpoints require API key authentication Forbidden: description: Forbidden - Insufficient permissions content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: insufficientPermissions: summary: Insufficient permissions value: error: code: FORBIDDEN message: Insufficient permissions to perform this action InternalServerError: description: Internal Server Error - Unexpected error occurred content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' examples: internalError: summary: Unexpected server error value: error: code: INTERNAL_ERROR message: An unexpected error occurred. Please try again later. securitySchemes: ApiKeyAuth: type: apiKey in: header name: Authorization description: >- API key authentication. Include your API key in the Authorization header. ````