How would you like to have a piece of the action involving one of today's largest online marketplaces? Perhaps you have an idea for an innovative electronic storefront, but you don't want to build the back-end or try to implement the marketing campaign you need to attract the millions of users that you know you'll please. Or maybe you're looking to integrate your enterprise with an existing e-tailer. Perhaps you have another idea altogether and just need the customers to support it. Look no further than eBay! With the eBay software development kit (SDK) and lower-level web-based application programming interface (API), you can craft applications that tap eBay's vast product, server, and customer resources. Your application can be hosted on a web server, on your customers' desktop workstations, or on the latest mobile gadgets such as a personal digital assistant or smart phone. eBay Application Development shows you how to do just that. After reading this book, you'll understand what the eBay interfaces provide through both their SDK and their API; how you can partner with eBay to design, develop, certify, and deploy your application; and, most important, the technical nuts-and-bolts behind actually writing applications that use both the SDK and API.