I'm actually quite surprised that Apple hasn't made it a requirement that Apple Pay needs to be one of the payment options when you pay via an app. It astounds me that some companies still make you enter a credit card to pay via their app when there's a safe, secure payment system built into the device's operating system. If you don't want your credit card stored then you have to enter the bloody number each time you place an order. An example is Blaze Pizza. They let you pay with Apple Pay in person at the store but if you want to place an order via the app then Apple Pay isn't an option.