All payment processing is done through Gumroad; a service I use to sell my MasterClasses.
All payments are secured. You'll notice you'll be redirected to a secure Gumroad link the moment you click "I Want This." You can securely complete your purchase there.
Info about how to access your purchase(s) will be emailed to you.
For a much better explanation of Gumroad's secure payment processing, GO HERE.