You don't need a Paypal account, any credit card will do.

step1

Step 1. Enter your name, and invoice number.
Click, the 'Pay Now' button.

2b

Step 2. Enter the payment amount, and scroll down the page, and click the 'continue' link.

step3

Step 3: Fill out the payment form and at the bottom of the page, click the 'Review Order and Continue' button.