add validity check for username during registering to not allow _ in username... for instance nomo_90c is not a valid username because it includes underscore, but app checks it as valid username and user can proceed with premium account purchase causing embarrassment for us.
add validity check for username during registering to not allow
_in username... for instancenomo_90cis not a valid username because it includes underscore, but app checks it as valid username and user can proceed with premium account purchase causing embarrassment for us.