Set this argument to the id of the user. In case you do not have the user id, you can also assign the user via a given email.
Add the tags you want to add to the user. This argument accepts a comma-separated string, as well as a JSON construct.
Advanced: Register a custom action after Webhooks Pro fires this webhook. More infos are in the description.
(String) Register a custom WordPress hook callback. The value will be called as followed: do_action( $yourdefinedaction, $action_return_data, $request_data )