<DIV><p>If your web application's success depends on how quickly and easily users can make transactions, then PayPal is a solution you can't afford to overlook. This book helps you determine which PayPal option is best for your situation, and provides step-by-step instructions for implementing the payment method you choose—whether you're accepting money via the Web or mobile devices for products and services, donations, or anything else.</p><p> You'll find sample code written primarily in PHP and Objective-C, as well as use cases for executing options with PayPal's API. By the end of this book, you'll have a clear understanding of PayPal and how you can get the most out of its powerful features, no matter how much API programming experience you have.</p><ul><li>Learn how to work with the PayPal API, and choose the right integration method for your project </li><li>Explore PayPal's Express Checkout option, including its unique workflow and four methods of operation </li><li>Examine the Website Payment Pro method—with a focus on direct payments </li><li>Consider Adaptive Payments and learn how to set permission levels for their use </li><li>Use PayPal in your iOS or Android-based mobile app with the new Mobile Express Checkout method </li><li>Test your PayPal implementation with the sandbox </li></ul></div>