In my app, there is already a working auto renewal subscription and now the requirement is to add the 3 months free trial to all the new users and already existing subscribers in the app. Since promotional offers don't work for the new users(non subscribers), so do I need to create introductory offer for new users and one promotional offer for the existing users? Also, If the existing user uses that promotional offer , then what is the way to not show him that promotional offer again in the application UI? How can I test these scenarios through sandbox testers?
