Apex REST and Custom Web Services

In this chapter, we are going to continue this section of the book by discussing how we can expose Apex classes as RESTful web services. In the previous chapters, we saw a variety of different integration options and how we can utilize them to build more scalable solutions that interact with external systems. A common use case for these options was making callouts to external services to integrate them with Salesforce from the Salesforce side. This is referred to as an outbound integration, as we are making a call from Salesforce out to an external system. In Chapter 12, Using Platform Events, we discussed the use of platform events and how they can be utilized to provide bidirectional communication, which is both an outbound integration through the external consumption of events, but also an inbound integration by having external services publish platform events to be consumed on platform.

This chapter focuses on another method of providing inbound...