Apple Pay occasionally stalls: window appears but then sometimes doesn't execute payment
Most of the time, when I'm using Safari on my Mac, it will happily use Apple Pay on my iPhone 16 Pro for payment .
Irritatingly, about 20% of the time, Apple Pay stalls. I get the Apple Pay window, the 'processing' circle rotates briefly - and then disappears, leaving the Apple Pay window doing nothing. It is not tied to any particular website, and choosing a different card makes no difference.
The only workaround is to restart the Mac. I've tried reloading the web-page, relaunching Safari, and logging out of my account, but none of those make any difference - it takes a restart. I had similar problems when running macOS14, and on my previous iPhone.
Oddly, I can try again the next day, and Apple Pay might work, even on the same website.
My software is up-to-date: I'm running Safari 18.3 on an M2 Mac mini running macOS15.3
Mac mini, macOS 15.3