Introduction

PayPal is one of the most popular and convenient ways to make a payment to someone who owns a PayPal account. PayPal provides the integration with the shopping cart (using their different checkout mechanisms) as well as the integration with the back-office (using their APIs and IPN). In Chapter 6, VirtueMart Integration, we looked at the integration of ADempiere with the Joomla! VirtueMart shopping cart, which provides integration with the PayPal checkout. In this chapter, we will focus on the back-office integration of PayPal with ADempiere to process payments online.

As we all may know that, in order to transact with PayPal, one needs to have a PayPal account. PayPal offers different types of accounts which serve a specific purpose like a buyer account or a seller account, and so on. While we are building the integration layer, we will have to go through many cycles of testing and verification. Doing this in the production environment is next to impossible to imagine, as...