The only way we support payment processing ultimately involves using our card vaulting servers in the flow of processing the transactions. If you intend to process checkouts with a service like PayPal or FPay, you could consider instead using order resources instead, which I see you created a new thread asking about. It’s worth noting though that I don’t think you’re going to be able to get published on the app store this way. I personally don’t handle submissions, but I do think I recall not bypassing our checkout as a requirement during the application process.
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