[Mobile Payments] Try out Tap to Pay doesn't work from the About TTP screen

[joshheald]

Description

When attempting to set up/try out tap to pay from the About Tap to Pay screen, the try out step doesn't work.

It just spins for a moment then stops. This button is only supposed to show until you have at least one TTP payment on that site/device.

This is a secondary access point for trying out the TTP functionality, and may be superseded by planned work for improving the flows.

Repro

1. Delete the app from your phone to clear the saved TTP transaction state
2. Log in to a TTP-eligible site
3. Navigate to Menu > Payments > About Tap to Pay on iPhone
4. Tap Set up Tap to Pay on iPhone
5. Go through the set up process
6. Tap Try a Payment
7. Observe that the spinner shows for a moment and nothing else happens.

Screenshots

https://github.com/user-attachments/assets/ea421e89-57a5-4999-9d7c-40d0f2b60505