Google Checkout is an affordable way for us to take credit cards online. We tell Google what classes we have available and what they cost, and they handle the actual financial transaction, so we never even have to see your card number.

Sometimes when people use this system for the first time, they get stymied by having to make a Google Checkout Account. Don't get hung up on this. If you have a Gmail account, you effectivly have a Checkout account already. If you don't use Gmail, all they want extra is a username and a password. It's just like Amazon (except Google doesn't store a credit card number with your account). Google sees Checkout as a product, and they want you to make an account so it's easier for you to use their system again in the future.