public function getUserAuthenticationConfiguration($email, $password) 
    {
        return [
        'grant_type'    => 'password',
        'client_id'     => $this->getClientId(),
        'client_secret' => $this->getClientSecret(),
        'username'      => $email,
        'password'      => $password,
        'scope'         => $this->getScopes(),
        ];
    }