Why Pay Pal requires me to give my credit card number? I started to use Pay Pal mainly, because I don't want to give my card number to any internet system. I use euros instead that I have moved to my PayPal account. Now even if I have enough euros on my account to pay my shopping, Pay Pal still requires me to give my credit card number "to complete the payment". If I don't do that, my PayPal payment is rejected and I have to change payment method (have to use my credit card anyway...). Using euros from my PayPal account is set as a principal payment method in my settings.