I have investigated the issue and made some corrections of the facebook-connector side.
Please, open the
https://apps.facebook.com/f-commerce-go/ application and re-add the site to any of your pages using instructions provided by this application. Be noticed, that it may take about two minutes sometimes after you entered your site URL and pushed "Apply" button there for adding the site to FB page.
As an example, I've added your site to the one of my test pages here
https://www.facebook.com/pages/My-test-page/112485552153383?sk=app_165931960160897