Does it sync only username and pass?

Hi there,

Right now, the plugin only sends the email & name fields since all other MailChimp list fields are dynamic and a little hard for the plugin to guess.

You can send more fields by adding a few lines of code to your theme its functions.php file (or by creating a small plugin, but that’s a bit harder).

The following will send the URL in the user profile to the MailChimp WEBSITE field.

add_filter( 'mailchimp_sync_user_data', function( $data, $user ) {
    $data['WEBSITE'] = $user->user_url;
    return $data;
}, 10, 2 );

Basically, you can use the above code to send anything you want since you have access to the $user object. If you need more info on how to set that up, please let me know!