If you choose Create User Event you can:
Add users to Mapp Engage group with attributes. The email field is always required.
Custom and Addon - core attributes are default in mapping and have to be set in Zapier UI.
Custom and Addon attributes have to be added with the name and value in section Additional parameters and added with source name in the mapping setup.
Update user profile
Unsubscribe users from the group - choose the group and switch the Unsubscribe flag to True.
Send an email (prepared message) to a single user with additional parameters: choose message-id from the list of prepared messages and add additional parameters and use them in emails (optional).
Save your zap and turn it on to go live!