Possibility that my customer can pay both PayPal and Credit Card

Thanks for that info

but in addition i need to have the posibility that my costumers can pay by credit card

what i need to do?

Instead of PayPal Standard, kindly use PayPal Pro so your customers can have both PayPal and credit card payment options.

How-to-Integrate-Form-with-Paypal-Pro

However, please note that you need to have a paid business PayPal account in order to use PayPal Pro.