[HOW TO] Login to your forums with external applications such as C#, Python etc etc..

<?php

$min_seconds_between_refreshes = 3;

session_start();

if (array_key_exists('last_access', $_SESSION) && time() - $min_seconds_between_refreshes <= $_SESSION['last_access']) {
    // The user has been here at least $min_seconds_between_refreshes seconds ago - block them
    exit('You Are Trying To Use The API Too Fast, Please Try Again Later...');
}
// Record now as their last access time
$_SESSION['last_access'] = time();



$host = 'localhost';
$user = 'DB_Username';
$pass = 'DB_Password';
$db   = 'DB_Name';

$mysqli = new mysqli($host, $user, $pass, $db);

$user        = $_GET['username'];
$password    = $_GET['password'];
$IPNPassword = $_GET['IPNPassword'];
$tables      = "mybb_users";
$tables2     = "mybb_userfields";

$sql    = "SELECT * FROM " . $tables . " WHERE username = '" . mysqli_real_escape_string($mysqli, $user) . "'";
$result = $mysqli->query($sql);
if ($result->num_rows > 0) {
    // Outputting the rows
    while ($row = $result->fetch_assoc()) {
        
        $password    = $row['password'];
        $salt        = $row['salt'];
        $plain_pass  = $_GET['password'];
        $stored_pass = md5(md5($salt) . md5($plain_pass));
        
        function Redirect($url, $permanent = false)
        {
            if (headers_sent() === false) {
                header('Location: ' . $url, true, ($permanent === true) ? 301 : 302);
            }
            exit();
        }
        
        if ($stored_pass != $row['password']) {
            echo "Password Incorrect<br>"; // Wrong pass, user exists
            die();
        } else {
            
            $GetUserID = $row['uid'];
            
            $sql2    = "SELECT * FROM " . $tables2 . " WHERE ufid = '" . mysqli_real_escape_string($mysqli, $GetUserID) . "'";
            $result2 = $mysqli->query($sql2);
            if ($result->num_rows > 0) {
                while ($row2 = mysqli_fetch_assoc($result2)) {
                    $GetUserSalt = $row2['fid5'];
                    
                    
                    if (empty($GetUserSalt)) {
                        die("No Secret IPN Has Been Set");
                    }
                    
                    if (empty($IPNPassword)) {
                        die("You Did Not Enter A Secret IPN Password!");
                    }
                    
                    if ($IPNPassword != $GetUserSalt) {
                        die("Secret IPN Password Wrong!");
                    }
                }
            }
            
            
            
            echo "Password Correct<br><br>"; // Correct pass
            
            $MainGroups      = $row['usergroup'];
            $SecondaryGroups = $row['additionalgroups'];
            
            $Registered      = "2";
            $Moderators      = "6";
            $SuperModerators = "3";
            $Administrators  = "4";
            
            echo "Current Main Groups<br>";
            if (strpos($MainGroups, $Registered) !== false) {
                echo "Registered<br>";
            }
            if (strpos($MainGroups, $Moderators) !== false) {
                echo "Moderators<br>";
            }
            if (strpos($MainGroups, $SuperModerators) !== false) {
                echo "Super Moderators<br>";
            }
            if (strpos($MainGroups, $Administrators) !== false) {
                echo "Administrators<br>";
            }
            echo "<br>";
            echo "Current Secondary Groups<br>";
            if (strpos($SecondaryGroups, $Registered) !== false) {
                echo "Registered<br>";
            }
            if (strpos($SecondaryGroups, $Moderators) !== false) {
                echo "Moderators<br>";
            }
            if (strpos($SecondaryGroups, $SuperModerators) !== false) {
                echo "Super Moderators<br>";
            }
            if (strpos($SecondaryGroups, $Administrators) !== false) {
                echo "Administrators<br>";
            }
        }
        
        
    }
}
?>