You do NOT need to have or create a PayPal account. These are the steps to take if you just want to pay with a card without joining PayPal.
After you press the “Purchase” button, you will be taken to a PayPal payment page. There you can scroll down to see a “Pay by Debit or Credit Card” button. Press this .
On the next page you then need to scroll down to the control “Save information and create your PayPal account”. UNCHECK that box to complete payment as a guest.