Registrant Group Management API Endpoints

Registrant Groups

Introduced two new endpoints for managing registrant group assignments via the API:

• POST /api/v1/registrant/{registrant_id}/group/{group_id}
  Adds a registrant to an existing group, following the same business rules as the UI.
  Automatically updates:

  • group_id for the registrant
  • All associated line items and hotel records
  • Transaction ownership and balances
  • Returns the full updated registrant object.

• DELETE /api/v1/registrant/{registrant_id}/group
  Removes a registrant from their current group.
  On removal:

  • The registrant becomes their own group primary
  • Transactions are restored to original owners
  • Financial totals are recalculated
  • Returns the updated registrant object reflecting the changes.

Both endpoints include robust validation and error handling for:

• Invalid or missing parameters
• Registrant or group not found
• Violations of business rules (e.g. cross-event group assignments, invalid statuses)
• Authorization and access checks

API documentation includes detailed response schemas, usage examples, and error scenarios.