Feature Request: Include license_expiration metadata in /v1/products JSON payload

The Problem: There is a data discrepancy between the Creem Dashboard and the Creem API. While the dashboard allows us to set a specific "License Expiration" duration for one-time products (e.g., "4 days"), this information is completely missing from the JSON payload returned by the /v1/products and /v1/products/{id} endpoints.