This is absolutely a fair question, since Apple Pay will of course be connected to a legitimate credit card number, as opposed to our Bogus Gateway or these false credit card details used to simulate orders via Shopify Payments. However, as long as your Shopify Payments gateway remains in test mode, the order will be treated as a test order, and we should see this banner across the top of your order page:
All of that to say you definitely have options! Let me know if you run into any questions or challenges once you've had the chance to run a test or two. Have a wonderful day!
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