Fairphone

I'm a very happy iOS user planning on switching to the FairPhone when my iPhone finally craps the bed. I figure the switch will mostly be easy or just a matter of "go do this on your laptop or a web browser instead," but the two things I am most worried about are:

• Find My iPhone alternatives for FairPhone. I'm an idiot who sometimes loses my phone when the ringer is turned off, so calling it does not help. This is the biggest sticking point for me because I am forgetful and I feel without this feature I might have ended up having to buy a lot more new phones because I couldn't find mine. I know they do have one through Google but wonder if there is such a feature without Google.
• if it can do payment at stores (I've gotten very cozy with Apple Pay) or if I need to start carrying a credit card around again. This is mostly a convenience thing, although there are some card readers that reject my credit card and happily take the same card through Apple Pay, so sometimes it's an actual need. I could probably get around it by just ordering a replacement credit card though.