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. 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. Learn how to work with the PayPal API, and choose the right integration method for your project Explore PayPal’s Express Checkout option, including its unique workflow and four methods of operation Examine the Website Payment Pro method—with a focus on direct payments Consider Adaptive Payments and learn how to set permission levels for their use Use PayPal in your iOS or Android-based mobile app with the new Mobile Express Checkout method Test your PayPal implementation with the sandbox

If your web application’s success depends on how quickly and easily users can make transactions, PayPal APIs provide effective solutions you can’t afford to overlook. This concise book takes you hands-on through several options to help you determine the best choice for your situation, whether you’re collecting money via websites or mobile apps for products and services, donations, or anything else. In each chapter, you’ll work with a different PayPal API by integrating it into the book’s sample application, using Python and the Google App Engine framework. This expanded edition introduces two new options: Express Checkout for Digital Goods and Instant Payment Notifications, complete with sample project code. By the end of this book, you’ll understand how to take full advantage of PayPal and its powerful features. Learn PayPal API basics, and get an introduction to Google App Engine Explore the Express Checkout option, and understand what distinguishes it from other generic workflows Tailor Express Checkout for electronic documents, videos, and other “in app” digital purchases Apply the Adaptive Payments option for transactions that involve multiple recipients Embed the payment process into your site with no mention of PayPal, using Website Payments Pro Use the Instant Payment Notifications you receive as triggers to take follow-up action

Shows developers how to harness the power of services such as Google, eBay, PayPal, and Amazon.com from within an application, whether it is Web-based, Windows-based, or even a Microsoft Office application After a quick review of the basics, readers will dive into more advanced techniques such as calling the APIs from mobile devices, Office VBA programs, Windows Forms and Web applications, and even how to integrate the various APIs together for a complete solution Veteran Wrox author Denise Gosnell skillfully guides readers through the ins and outs of the various services, the anatomy of an API query, which features are available via the APIs, and how to get results from their own applicationsReaders will build two fully functional applications to apply what they have learned-one a Windows program, the other a Web application

Features ready-to-use applications-all available on the CD-ROM-that eBay sellers can plug right into their pages; more advanced users can tweak the applications to suit specific needs Shows you how to streamline an eBay business by leveraging programming technologies and the eBay API (application program interface) Explains how to connect eBay pages to the APIs of related companies (PayPal, Fed Ex, UPS, and the USPS) as well as to Microsoft Office applications such as Outlook and Excel Provides expert tips and tricks for implementing eBay technologies such as image handling, shipping calculators, enhanced About Me pages, and back-office tools

If you've bought or sold items through eBay, or through hundreds of other online sites, then you're familiar with PayPal, the online payment service. With PayPal, a valid email address, and a credit card or bank account, you can easily send and receive payments online. Not a bank or financial institution itself, PayPal describes its service as one that builds on the financial infrastructure of bank accounts and credit cards, and using advanced propriety fraud prevention systems, creates a safe, global, real-time payment solution. Put simply, PayPal provides the means for people to conduct financial transactions online, instantly and securely.But there's more to PayPal than meets the eye. PayPal Hacks shows you how to make the most of PayPal to get the most out of your online business or transactions. Authors Shannon Sofield of Payloadz.com and PayPal evangelist David Nielsen guide you through the rigors of using and developing with PayPal. Whether you're building an ecommerce site using PayPal as a transaction provider, or simply trying to pay for an eBay auction without getting burned, PayPal Hacks will give you the skinny on this leading global online payment service.The collection of tips and tricks in PayPal Hacks shows you how to find or even build the right tools for using PayPal to buy and sell on eBay or as a transaction provider for ecommerce on your own site. Written for all PayPal users, from those just starting out to those developing sophisticated ecommerce sites, this book begins with the basics such as setting up your account, then moves quickly into specific tips and tools for buyers, sellers, and developers.With PayPal Hacks, you can: Learn extra steps to help protect yourself while buying or selling on eBay Save time and money with advanced tips and undocumented features Learn dozens of easy-to-follow procedures to help you request and receive payments and fill orders Use PayPal to handle subscriptions, affiliate systems, and donations Create and customize your customers' checkout process Effortlessly integrate PayPal's shopping cart system into your own website Implement digital fulfillment with Instant Payment Notification (IPN) and Payment Data Transfer (PDT) Develop and distribute ecommerce applications with the PayPal API Each hack consists of a task to be accomplished or a creative solution to a problem, presented in a clear, logical, and task-oriented format. PayPal Hacks provides the tools and details necessary to make PayPal more profitable, more flexible, and more convenient.

APIs are transforming the business world at an increasing pace. Gain the essential skills needed to quickly design, build, and deploy quality web APIs that are robust, reliable, and resilient. Go from initial design through prototyping and implementation to deployment of mission-critical APIs for your organization. Test, secure, and deploy your API with confidence and avoid the "release into production" panic. Tackle just about any API challenge with more than a dozen open-source utilities and common programming patterns you can apply right away. Good API design means starting with the API-First principle - understanding who is using the API and what they want to do with it - and applying basic design skills to match customers' needs while solving business-critical problems. Use the Sketch-Design-Build method to create reliable and scalable web APIs quickly and easily without a lot of risk to the day-to-day business operations. Create clear sequence diagrams, accurate specifications, and machine-readable API descriptions all reviewed, tested, and ready to turn into fully-functional NodeJS code. Create reliable test collections with Postman and implement proper identity and access control security with AuthO-without added cost or risk to the company. Deploy all of this to Heroku using a continuous delivery approach that pushes secure, well-tested code to your public servers ready for use by both internal and external developers. From design to code to test to deployment, unlock hidden business value and release stable and scalable web APIs that meet customer needs and solve important business problems in a consistent and reliable manner.

Welcome to "Practical PayPal Integration in ASP.NET Core". This book will provide useful resources on PayPal Checkout and Subscriptions APIs and SDKs, as well as their applications in ASP.NET Core projects. I hope that this book will be useful for .NET programmers, software developers, and students of all skill levels, who are interested in integrating the PayPal REST APIs into their ASP.NET applications. You may often get confused with PayPal because there are so many frameworks and options to do the same thing. In fact, there are over 50 PayPal services, APIs, and SDKs out there – you just do not know which one is suitable for your applications. In this book, I will choose the latest PayPal products, services, APIs, and SDKs, and integrate them into your ASP.NET Core applications. Here are PayPal technologies that I plan to use: •PayPal Smart Payment Buttons – These new buttons, introduced in June 2018, provide a simplified and secure check out experience. They intelligently present the most relevant payment types to your shoppers automatically. •PayPal JavaScript SDK – This SDK integrates Smart Payment Buttons into your web site and renders them to a container DOM element. •PayPal Checkout .NET SDK – To simplify integrations, PayPal provides a .NET SDK for their Version 2 REST Payment API. Using the SDK over a direct integration allows the SDK to handle authentication on the server side for you. •PayPal Subscriptions API – I will implement a Subscriptions .NET SDK based on PayPal Version 1 Subscriptions REST API. This SDK allows you to easily integrate PayPal Subscriptions into .NET applications. In the first part of this book, I will explain how to use the PayPal Checkout .NET SDK to get start with the PayPal Version 2 Payments and Orders REST APIs. I will use various examples to demonstrate the procedures to complete a PayPal checkout transaction, including how to set up the development environment, how to integrate and render Smart Payment Buttons, how to create and manage orders, and how to capture and verify the transaction. In the second part of this book, I will switch to PayPal Subscriptions API. This API has not been ported to Version 2 yet, so we have to use Version 1 API for subscription. To make matters even worse, PayPal has never released a stable Subscriptions .NET SDK, which makes it difficult for .NET developers to integrate PayPal Subscriptions API into .NET and .NET Core applications. Therefore, I decide to implement a simple PayPal Subscriptions .NET SDK, which simply exposes various static methods that can be used to integrate PayPal Subscriptions API into .NET applications. I will use several examples to illustrate how to use this SDK to complete subscription transactions.