I tried to use Google Pay (back when it was Android Pay) at a Cumberland Farms and when the reader read my phone it actually crashed the payment system.

A few months later my grocery store put up "now accepts Android Pay" signs. I went through the self checkout lane and the phone was read, but the payment never went through. Had to use my card eventually.

Then my expensive phone broke and I bought one without mobile payments.

But it did work at Dunkin Donuts a few times, so there's that.