Tap to Pay on iPhone - Apple Developer
developer.apple.com
Payment apps can now accept contactless payments from contactless credit or debit cards, Apple Pay, Apple Watch, and smartphones with other digital wallets — right on iPhone and without any extra terminals or hardware.

I believe that Apple bought out the company behind this technology, but I wonder if something like this will ever come to Android phones.

It’s something that I’d use for when I do craft fairs and car boot sales without investing in a dedicated reader.