It gets worse though, the app actually split into "Google Pay" and the new "GPay", where the latter was originally an India-only app they reworked for the rest of the world. In old Google Pay you'd see messages that it'll stop working soon and that you should migrate to the new GPay, but if you ignored them you could still use it. Then, they eventually overhauled old Google Pay back to "Google Wallet", and now they're telling people in the US remaining on "new" GPay that it's deprecated and to switch back...
Pulled precisely from the Google textbook. Specifically the chapter on Hangouts.