For online payment from our system, all transaction operations are sent to Paypal which, as a payment portal, is responsible for charging the customer's credit card the amount due.
If you have registered your credit card on Paypal with username and password (so a paypal account has been created), the sentence: "Don't have a Paypal account? Open an account or pay with a credit or prepaid card" does not appear more, the sentence will appear: "Pay with your paypal account" or "Create a paypal account".
N.B: Payments on the Paypal portal must be made by registering with Paypal. It will no longer be possible to make payments without registering on the Paypal portal for security reasons and probably because there have been abuses in the past.
This happens because you have created a Paypal account in the past and registered your credit card with it and in this case it is no longer possible to pay without logging into Paypal.
This problem is solved by checking that you have the password of the Paypal portal (delivered to your e-mail upon registration) or Paypal gives the possibility to reset the password if you no longer find the e-mail delivered to you at the time of registration .
Once this is done, you can proceed with the payment although you have "0" as a credit as Paypal will take the amount due for the balance of the invoice from your card.
If by chance you have a new credit card you will have to enter the paypal portal: www.paypal.com and delete the old credit card data in your profile and insert your new credit card.
In this way you will be able to complete the payment.
PS: For other questions please contact paypal: https://www.paypal.it> for paypal in Italian, https://www.paypal.ch> for paypal in English, German, French