I've had the beta for some time now with no problem with contactless payments, until today, so, first thing I did was look and see if I had any system updates available and I did have one waiting, it was the official android 7 update and have been told the beta has finished now, so tomorrow I'll be going into a shop to see if my Google pay works again because I find it so handy, but, yes, I had the exact same notification today.