Registration

Let's start our coding to fulfill the preceding requirements. At first, we need to start with customer, CSR, and admin registration. As these users have different roles, we will give different user types for each user.

User types

To differentiate users, we came up with three different user types so their authorization will be varied when they access our REST APIs. Here are the three different user types:

Name	User type
General user/customer	1
CSR	2
Admin	3

User POJO

In our previous User class, we only had the userid and username. We may need two more variables to fulfill the business requirements we mentioned earlier. We will add password and usertype to our existing User class:

private String password;  
  /*
   * usertype:
   * 1 - general user
   * 2 - CSR (Customer Service Representative)
   * 3 - admin 
   */
private Integer usertype;
public String getPassword() {
    return password;
}
public void setPassword(String password) {
   this.password = password;
}
public void setUsertype...