How can I integrate my Paypal account to accept credit and debit cards payments, too?

You should add some of our PayPal integrations on your form. Then you need to setup this integration. You can check all PayPal integrations here:

https://www.jotform.com/integrations/search/PayPal

I would suggest you to try PayPal Standard. In order to setup this payment integration, you can check and follow this guide:

https://www.jotform.com/help/391-How-to-Integrate-Form-with-Paypal-Standard-

Please give it a try and let us know if you need any further assistance.