I have the very same issue right now.  Tried to look at the Transaction ressource that gives more details about a payment, but still no luck  

Open your Shopify Partner account.Go to your created appOpen App Setup.Scroll to Embedded app.It will redirect to a new frame. Turn off the embedded feature and add navigation URL there.

Open your Shopify Partner account.Go to your created appOpen App Setup.Scroll to Embedded app.It will redirect to a new frame. Turn off the embedded feature and add navigation URL there.