Retail Application - LoginReq jason which user name and password

After watching Module 16.
I installed tomcat and xampp.
Both running fine. But while writing loginReq jason which user name and password I have to give.

{
"username":"its.thakur@gmail.com",
"password":"Soap1234"

}

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<Response xmlns="http://localhost/Retail_App_Rest/retail/admin/login">
<errMsg>invalid username/password</errMsg>
<loginStatus>failure</loginStatus>
</Response>