Be careful: paying with Google Pay is extremely easy and the default setting is monthly recurrence. If you're not logged in, the only way to cancel (as far as I know) is by sending an email, which is incredibly precarious.
in those situations, especially if the business is unresponsive, i just keep charging back until they stop. if i can subscribe easily, i should be able to cancel just as easily :)
There's one for subscriptions where you give it a monthly limit and if you want to end your subscription and they're being difficult you can just cancel the card.
It's great to basically never be beholden to anyone holding my payment info hostage. I know charge backs exist but while I've never had problems, I would imagine the more you end up having to go down that avenue the more likely you are to have problems using it.