After user plays I ask him:
If you login -> Goto login Window sending Score (like a GreyBox or something that gives me the posibility to send score and login users)
Else -> Do Nothing
How i can call an external page or function to send the variable Score and gives me the possibility to login users.
Develop games in your browser. Powerful, performant & highly capable.
Use the Browser.Go to URL (or Open URL in new window).
Link to the login process of your website, and add a score variable to the URL that you will process on login.