Credit cards have always been a usable payment method, Apple Pay just makes them easier to use in an app. No one used them for IAP of digital goods because Apple forbade that on a policy level, which is likely to continue. Likewise, apps already allow credit card purchases for real-world items like Uber rides, Amazon physical items, etc.
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So companies[1] that had to previously shut down because of the 30% can return?
[1] - http://www.cnet.com/uk/news/as-iflow-reader-app-closes-harsh...
Almost certainly not.
Credit cards have always been a usable payment method, Apple Pay just makes them easier to use in an app. No one used them for IAP of digital goods because Apple forbade that on a policy level, which is likely to continue. Likewise, apps already allow credit card purchases for real-world items like Uber rides, Amazon physical items, etc.