I want to use the free trial of Stadia without putting my credit card details
Hi @Petroid2470_YT ,
that's currently not possible. Stadia uses your credit card not only for payment but for validation process, too. You will be charged 1$ / 1€ in this process.
Yes, you will also need Credit card information for Stay at home trial. It will charge you money even tho it says it wont.
The charge is just an authorisation will drop after few days.