public function verifyCode($clientID, $clientSecret, $redirectURI, $code)
    {
        $response = $this->get('oauth2/access_token', [
            'client_id'     => $clientID,
            'client_secret' => $clientSecret,
            'grant_type'    => 'authorization_code',
            'redirect_uri'  => $redirectURI,
            'code'          => $code
        ]);

        $result = \false;
        
        if (!empty($response['access_token'])) {
            $result = $response['access_token'];
        }
        
        return $result;
    }