I put my server's address in the "Sale Notification Postback URI" field for my designer, but (after having received a purchase) it doesn't seem to be functioning. Is there a way to test this without making actual purchases?
From my logs, the best I can tell is that it seems the server receives no post request at all.
There's currently no way to test this without a puchase. For now you can make a purchase yourself, then refund it.
I'll add it to our todo list to add a way to trigger a test.