[iceeedr]

You're Steam, your server not.

stock xIsUserNoSxe(id)
{
    // ID
    new xGetAuth[64]

    // ID
    get_user_authid(id, xGetAuth, charsmax(xGetAuth))
    
    // True
    if(equal(xGetAuth, "VALVE_4:4", 9))
        return true
    
    // Return    
    return false
}