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Because PayPal has provided a test client called API Client that illustrates how to use each of the avail- able methods, they are not covered in this chapter. Please visit the Help Center in the PayPal DeveloperZone for more information on downloading the API Client project. Other Ways to Use the PayPal APIIn the previous section, you looked at an example of how to use the PayPal API in your applications. Here are a couple of other ideas of how you might use the PayPal API: .Perform a search for transactions that were denied so you can follow-up with those customersto make alternate payment arrangements. .Perform a search for transactions that were processed over a particular time period to calculateyour total sales revenue. Third-Party PayPal ExtensionsVarious third parties offer solutions that work with PayPal, including some that use the API. You canfind a list of what some of these third parties have done on the PayPal Web site. The list is currentlylocated at: https://www.paypal.com/us/cgi-bin/webscr?cmd=p/pdn/3p-solutionsSummaryPayPal is a leading online payment provider that allows buyers and sellers to exchange funds in variousways. Buyers can securely provide credit card and other payment methods to PayPal and then PayPalhandles disbursement to the specified merchant. PayPal has made various features available in an API tomerchants so that the transactions can be managed from custom programs. You learned the various fea- tures supported by the PayPal API, as well as how to call the API using SOAP. Additional examples areprovided in the API Client project in the Help Center of the PayPal developer site, as well as in the otherdocumentation contained on that site. With PayPal under your belts, let s turn to Chapter 7 where you learn about several additional APIs, including InterFax, UPS, FedEx, and Bloglines. 162Chapter

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