Is there a recommended action to take for ensuring Google Wallet works when going from M3 to M4? I'm planning on wiping everything (data, cache, etc.) and start anew. Wallet works perfectly fine for me on M3, but I don't want to upgrade if there are risks in flashing a new ROM build.
I installed Wallet through the desktop site exploit that was unveiled a couple weeks back. Don't know if that is relevant.
No. Nothing will (most likely) happen to GW if you wipe data. They just started reprovisioning cards a day or two ago for those who have wiped data, and I've flashed two roms today both clearing data/cache/dalvik and GW has worked flawlessly every time.