In the previous chapter, we extended the Magento backend and learned how to use some of the backend components, so that store owners can manage and manipulate the gift registry data of each customer.

In this chapter, we will go over the following topics:

While the backend provides an interface for day-to-day operations, sometimes, we will need to access and transmit data to and from third-party systems. Magento already provides the API functionality for most of the core functionalities, but for our custom gift registry extension, we will need to extend the Mage_Api functionality.