Returns a valid list of Cancel Reason Codes for a specific PolicyID

Overview

Returns the list of valid cancellation reason codes for a specific policy. The results are scoped to the policy's PolicySet. If reason codes are configured with PolicySetCode filtering, only the codes matching the policy's PolicySet code are returned.

Use this endpoint to populate a cancellation reason dropdown or to look up valid CancellationReasonID values before calling the {policyID}/Cancel endpoint.

⚠️ Note: This endpoint is semantically a GET. It is read-only with no side effects. It uses POST because the PoliciesController applies [HttpPost] uniformly across all actions rather than matching HTTP methods to intent.