An online store is of little use if you can't sell products to customers. We will thoroughly explore the topic of payment processors in Chapter 4, Building Payment Processors. For now, however, to succeed in our promise to build a fully functional web store in 30 minutes, we will make use of a quick payment-integration with the Google Checkout API.
First, you will need to sign-up for a Google Checkout account. For the examples in this book, it is recommended that you use the Checkout sandbox, which is a test bed, non-live version of the Google Checkout system. You can get a seller account in the sandbox at the following URL: http://sandbox.google.com/checkout/sell.
Once you have an account, you can access the API document from this URL: http://code.google.com/apis/checkout/developer/.
We will create a very simple Buy It Now button using the Checkout API. After you create a sandbox seller account and log in for the first time, you can access several...