To cancel Google automatic payment, you need to go to pay.google.com and remove paypal as a payment method. Then log into paypal and you should be able to cancel google automatic payment. Sorry for the very late reply, I was facing the same issue as you today and I had to do some research myself to figure this out. It's kinda dumb how difficult it is to cancel google payment, and there's really no guide out there on how to do this, had to figure it out myself.
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