When creating attendees through the API, you can include answers to custom registration questions as part of the request. This allows you to send complete registration data in a single call, which is useful when syncing attendees from external forms, systems, or CRMs.
To include question responses, pass question_id and answer pairs using the questions array in your attendee creation request.
You can find the question_id by going to Event Settings > Registration Questions and clicking the # icon next to the relevant question.
For full details and examples, refer to the HeySummit API v2 documentation at https://developers.heysummit.com/.