How to Build a Basic Salesforce REST API (With Test Class) and Test with POSTMAN Salesforce : Creating Anonymous Apex REST APIs with Force.com The Force.com REST API lets you integration with Force.com applications using standard HTTP methods. This API provides a way to expose the data you have within your Force.com application to external applications – both mobile and non-mobile. A few useful bits of information related to these REST APIs: This sample Code you how to implement a simple REST API to fetch Account in Apex class: @RestResource(urlMapping='/Account/*') global with sharing class MyRestResource { @HttpGet global static Account doGet() { RestRequest req = RestContext.request ; RestResponse res = RestContext.response ; String accountId = req.requestURI. substring ( req.requestURI. lastIndexOf ( '/' ) +1 ) ; Account result = [SELECT Id, Name, Phone, Website FROM Account WHERE Id = : account