I've been having problems for the last 24 hours making in-game purchases using Google pay, (it's not an issue with me as I have funds in my account and I'm able to make purchases for other things on Google play and purchase things in other games using Google pay) and it's getting rather annoying. I've messaged their help chat and I'm told they are aware of the issue only affecting people trying to purchase using Google pay and they are working with Google to fix it. Please hurry up!