The Salesforce Apex API opens up the root Salesforce Apex code and architecture to outside developers through a RESTful interface.
Third-party services/applications that are external to can use the Apex REST API to connect to Salesforce and retrieve data (records, field values), or to update data on a client’s account.
The Salesforce Apex REST API, in particular, exposes Apex methods via REST and it makes it possible for developers to create REST-based web services using Apex code. There are tens of APIs available on the Salesforce platform that enable developers to programmatically interact with the platform. Understanding Salesforce Apex REST API Image Source You will also gain a holistic understanding of API, REST API, Salesforce, its key features, and the methods used to call the REST interface directly. In this article, you will gain information about Salesforce APEX REST APIs. B) Send Data to an External Service Using the Apex REST API.A) Get Data from an External Service Using the Apex REST API.Overview of the Apex REST API Callout Architecture.