If you want to pay with your credit card without signing up on the page, you should do that though. Click on “Pay with a debit or credit card, or PayPal Credit”.
Now, you are presented with a form that requires the information about your credit or debit card. Depending on your country, you may also be asked to enter your address, email address, or phone number. To continue after entering all the information necessary, simply click on “Pay” at the bottom of the form.