I recently tried to pay with a card that is not my default in Apple Pay using the Apple Watch, and I did not succeed.
My Watch is running the latest version of watchOS 7.
I did the following.
- Added a second card to Apple Pay (both in the Watch and the iPhone).
- When ready to pay, pressed the side button (the one underneath the crown).
- Moved the crown until I heard the name of the card I wanted to pay with.
- Place the watch near to the card reader so that it processed the payment.
It did process the payment, but it used with the card I have set as the default in Apple Pay, instead of using the card I had selected with the crown.
Has anyone experienced this issue? Any workarounds?