I will create a iOS app for restaurants, so you can easily pay for your food via the app. So looking at the apple rules:
https://developer.apple.com/app-store/review/guidelines/#in-app-purchase https://developer.apple.com/app-store/review/guidelines/#physical-goods-and-services
So this is physical goods and not in-app purchases right?
My question is this: Can I choose ANY type of payment gateway, so I could just create a button in the app "Approve payment" and send this to my PHP backend, which will take care of all functionality regarding payments.
Or do I have to use Apple pay or go by some other rules?