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Register Participants using API with Custom Registration Questions

Learn how to use API endpoints in order to send custom registration questions with event registration for registrants (using Sequel registration type)

Updated over 2 months ago

To send custom questions you need to run two endpoints to make sure you map the correct answers. First, you'll verify requirements of the Event object, then the registration itself. NOTE: This method is only valid for Sequel registration as third party forms are handled elsewhere.

Full API Documentation can be found here for reference.

To find the client ID, secret, etc. needed for your company specifically, navigate to the embed tab of any event within Sequel dashboard. This is only available to admins on Business plan and above.

First, Get event Endpoint

This will return the Event object with the registration object containing all the custom questions assigned to it. An example response is below:

You can use the customQuestions to fill in the answers for the user when you register them.


​Note* For all fields that have isRequired as true, a response is required or you may run into errors. So, if you have required fields in Sequel registration, they have to have answers or you'll receive an error.

Second, send the answers to the Registrant endpoint


Using custom questions you can send a payload to register a user like this:

This will register the user to the event and it will map the answer with the test field 1 question (in this particular example).

Make sure that questionId matches with a questions from the Event object.
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​Note* if you have dropdowns, the Event object will return all possible values.
Please ensure to pick a value from the list.

Have a question that wasn't answered here? You can search in our Help Center, reach out to your CSM or email support@sequel.io. We're happy to help!

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