Check feature entitlement

GET https://sandbox.api.tansoflow.com/api/v1/client/entitlements/{customerReferenceId}/{feature-key}

Performs a lightweight check to determine if a customer has access to a specific feature. Returns an isAllowed boolean with an explanation in meta.reason.

This is the fastest way to gate features — no request body required. An audit event is recorded for traceability. For usage simulation with pre-flight quota checks, use the POST endpoint.