Any update on this issue Apple?

I have one question regarding Apple Pay. Consider registering as a member for a web + mobile app for Mobile. I need to charge $25 - $1000 for membership. Am I allowed to make the user pay for membership registration using Apple Pay as a membership fee or do I need to make the user pay using IAP? Note: It's a hypotheical voting app with members only voting rights. Can I charge the user for membership using Apple Pay or am I suppose to charge him using IAP?