ClassDex displays your classes on your website, and allows website visitors to register and pay for the classes online. The checkout and payment process is handled through the Cart66 plugin — a third party plugin (available for free) which needs to installed and configured before you begin to use ClassDex.
Cart66 can be configured to work with several different payment gateways (Paypal is the most commonly used). Cart66 should be configured to send you a copy of the payment receipt each time a user makes a payment — this way you are sure to have all of the information. When a user makes a payment for a class, you will receive an email from your payment gateway. ClassDex does NOT automatically enter this information into the system. You need to manually find the student in ClassDex (or add the student if they are new), register them for their class or classes, and make the payment (selecting “Paypal” as payment type).