Prior to 1.2
1. Extract the Registration Client ZIP.
2. DB folder is already present and structured.
3. Launch the Reg Client and log in.
4. Verify the first request as mentioned below.

End Point -
POST /v1/authmanager/authenticate/useridPwd HTTP/1.1
Request-
{"request":{"userName":"110119","password":"Techno@123","appId":"registrationclient"}}

Response- message=Username and password combination had been validated successfully

In 1.2
1. Extract the Registration Client ZIP.
2. DB folder is not created.
3. Run the run.bat file.
4. DB folder will be created.
5. Login with valid credentials and verify the first request as mentioned below.

End Point -
POST /v1/authmanager/authenticate/useridPwd HTTP/1.1
{"request":{"userName":"110119","password":"Techno@123","appId":"REGISTRATIONCLIENT"}}

Getting unable to authenticate message because appid is 'REGISTRATIONCLIENT' (uppercase) instead of the lower case.