If you are looking for an alternative to using PayPal as your payment processor for your online courses, Payment Express is another great option.
Litmos has partnered with payment gateway provider PaymentExpress.com and through this integration we can process credit card transactions to over 35 banks around the world including 13 in the USA.
When you are setup with PaymentExpress, you can enable the integration from within your Account Settings -> Litmos features menu in Litmos. Just click on the "Ecommerce" tile and fill out the fields as shown in the screenshot below. You will use your PaymentExpress username and password to populate these fields. Once you have filled it out, hit save on the bottom of the page and your Ecommerce page is ready to go.