markgrenville

Thanks for the clarification Lap and Harish.

Really nice to see such an active community.

Just to be clear. Is this the trigger that would be used for UltimateMember?
mc4wp_integration_wp-registration-form_subscriber_data

Or is there no slug for ultimate member yet?

FYI for anyone needing this functionality in the future. If you’re willing to hack the module I was able to achieve my requirements by editing:
includes/integrations/class-integration.php (line: 439)

$subscriber = apply_filters( 'mc4wp_integration_subscriber_data', $subscriber, $integration );

Then I was able to use this use this filter in my functions.php

 add_filter('mc4wp_integration_subscriber_data', 'mailchimpFilter', 10, 2);
 function mailchimpFilter($subscriber, $integration) {

     if ($integration->name == "UltimateMember") {
         $subscriber->tags[] = 'Member';
     }
     if ($integration->name == "WooCommerce Checkout") {
         $subscriber->tags[] = 'Customer';
     }
     if ($integration->name == "Contact Form 7") {
         $subscriber->tags[] = 'Contact';
     }

    return $subscriber;
 };

The problem with this is that you won’t be able to update the plugin. To ensure that automatic updates aren’t run then you can edit the version number:
mailchimp-for-wp.php (line: 6)

Version: 100.8.1

This seems to be working now?

Do you care to tell me how this is possible or send a link please?

I see that you have this hook. mc4wp_integration_subscriber_data is it possible to pick up the integration source when using this hook?

Is it theoretically possible to pass the $integration to the mc4wp_integration_subscriber_data filter in class-integration.php:439 in order to determine which integration is running and hook that function?

Also is it possible to set default tags and then use this hook to unset them?

I really feel like this feature is lacking with the direction mailchimp is moving. Tags are no longer a sub category, they are now a main category. Audiences (list) have become almost irrelevant.