You are entering credit card information on Stripe.com, not on Yukapo If you are worried about entering your credit card information on a site you do not know, please relax. As you can see on the source code of the page, you are entering your credit card information directly into Stripe.com thanks to <iframe> tag.
Google Pay is Active Now: You can pay with Google Pay without worrying about credit card security. (Google only informs us that the payment has been received) You can not see GPay if there is no saved card on your browser or phone