I'm thinking of getting Google Stadia. And that's why I wanted to know whether you can buy the Stadia subscription with Google credit or whether it is only possible with a credit card.
If it doesn't work with credit, there are options other than credit cards. (I don't want to apply for a credit card at my bank just for Google Stadia)
Google Stadia: payment methods at a glance
The Google Stadia payment methods sometimes differ depending on the region. We're looking specifically at Germany. The following are permitted in this country:
Credit card
Google Pay
paysafecard
PayPal if set up via Google Pay
At Stadia you can pay as normal using any of the payment methods available in the PlayStore. That means you can of course also pay with your PlayStore credit.