The current payment methods (as of January 2018) are

• Bank transfer,
• PayPal
• Credt/debit card.

NOTE: Here is how to pay with credit/debitcard using the PayPal checkout option: 

YOU DON'T NEED A PAYPAL ACCOUNT IN ORDER TO PAY WITH CREDITCARD. However, you will first need to choose PayPal as payment option, and then click the button "Create an Account" at the bottom of the page as shown below. This will present a new page where you can submit your creditcard payment. A temporary PaPal account will be created by PayPal for this payment only.