Find a form appeal code in the Gifts API

In the Gifts API response, the associated campaign/form's Unique Backend Identifier is project.unique_identifier, nested inside project alongside id, type and name. It is distinct from a designation's unique_identifier, the gift's transaction identity and event_unique_identifier.

Verify the actual form configuration and response for a known gift. The response uses the project’s current identifier; do not assume it represents an immutable historical snapshot of the appeal code at payment time.