Add new participants to the Campaign via the Registration method.

If you want to capture GDPR consent as well, add the consents property in the user object. The Consent ID can be found in the Settings Page of the app, where the GDPR consents are added.

You can use this API call to track how many times a participant has invited others. It increases the share counter for the relevant channel.
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Use the Get Participant data method to fetch information about your participants.