Unsubscribe user from list B if user already subscribe to list A

Hi there,

As you mentioned, this would require some custom coding to get working. You can use the unsubscribeFromList() method to remove a subscriber from the list:
https://github.com/mailpoet/mailpoet/blob/master/doc/api_methods/UnsubscribeFromList.md

That said, it will require more than a short code snippet like we could assist with here. If you need help with custom code, we recommend reaching out to someone from Codeable: https://codeable.io

I hope this helps! Please let me know if you have any questions.

We haven’t heard back from you in a while, so I’m going to mark this as resolved – we’ll be here if and/or when you are ready to continue.