WSO2 API Manager - How to get User profile with consumer key & secrete

WSO2 API Manager - How to get User profile with consumer key & secrete

Does anyone know how to get the user profile (including username &
password) via rest API provided by wso2am with consumer key and secrete?
Because we don't store username & password in client side but only
consumer key and secrete, and generally, we have to provide 4 parameters
(username,password,consumer key and consumer secrete) to get access token.
so we want to use only consumer key and secrete to get access token.