You may make a payment using PayPal. A PayPal account is not necessary in order to make a credit card payment. Look for various options on the PayPal portal.
Processing Note: Though is says “Please enter your donation amount.” in the PayPal window, it will be processed by Zellous.org as a regular payment.
Optional one payment (no recurring payment option) PayPal portal is at: https://www.paypal.me/zellous