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My credit card details are saved in my Gmail account because when I want to buy something online my wallet is usually in another room

I feel the risk is low, I trust google enough and there's really no risk as a cardholder anyway

The risk is low, but if the issuing bank finds out that your CC details were stored online they'd refuse to cover you if you were hit by fraud.

I store credit card details in a password manager that allows free-form entries (for example "pass").