In order to make sure GP integration works well with the newly upgraded GP version, please make sure of the following items-

1) Please follow the attached document and make sure you reinstall the GP Webservice and configure it as per instructions (Page 21-5).
2) Make sure your settings page of the integration app is configured the way it was before (refer admin access instructions document).
Once the above 2 in confirmed, you can try the integration again and send us the error log if you encounter any errors.