The group_code query parameter on availability endpoints now accepts allotment codes in addition to group codes. When a valid allotment code is provided, the response returns only the availability linked to that allotment. If no group_code is provided, the endpoints behave as before, returning general hotel availability.

An invalid group_code returns HTTP 422 with the message Invalid group code provided.

Affected endpoints: GET /hotels/{id}/availability, GET /hotels/{id}/availability/room_rates