I can confirm that the Google Payments Center has all my transactions and recurring payments. This is more than included in the Google Play interface.

For example, I have a Pixel Care+ subscription, billed monthly. I can manage and cancel that subscription. Same for Google One, billed annually, and an in-app subscription (links out to Google Play). Can change payment methods, add or remove a backup method, etc.

So, if you did set up a recurring donation through Google Pay, go to payments.google.com (on a desktop system) and see whether it can be managed through the web interface there. You'll need to verify your account.

PayPal has also offered good tools to manage recurring payments and subscriptions. If you set up payments through PayPal then you should be able to modify or cancel them, without even involving the payee.