SHIELD: disable autonomous user registration

This is what I use to create the SuperAdmin Account, it depends on what the default user group is set to in
app/Config/AuthGroups.php

PHP Code:

/**
 * createUser ()
 * -------------------------------------------------------------------
 *
 * @param string $userName
 * @param string $emailAddress
 * @param string $password
 */
public function createUser(string $userName = '', string $emailAddress = '', string $password = ''): void
{
    // Get the User Provider (UserModel by default)
    $users = auth()->getProvider();

    // Users record
    $user = new User([
        'username' => $userName,
        'email'    => $emailAddress,
        'password' => $password,
    ]);

    // Save the new user information
    $users->save($user);

    // To get the complete user object with ID, we need to get from the database
    $user = $users->findById($users->getInsertID());

    // Add to default group
    $users->addToDefaultGroup($user);
} 


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