satshoot : Payments: Checking for received zaps and notify user

- TODO: Check only for troubleshooting zaps

- TODO: Render payments in notifications

- TODO: Aggregate and show all zaps on Offers

- TODO: Aggregate and show zaps of a particular user on reputation cards

https://github.com/Pleb5/satshoot/commit/b865a48fb95cf9ee565f0ba510ee20bf54560c38