Currently I'm testing GetSingleItem using a GET request and receiving JSON results. Presently, I'm able to get the request to return success on an Item ID that I know exists.
Here is the request
http://open.api.ebay.com/shopping?version=849&appid=<MY APP ID HERE>&responseencoding=JSON&siteid=0&callname=GetSingleItem&ItemID=110121170457&IncludeSelector=ItemSpecifics%2CVariations
No matter what I do this will not work. However if I change the endpoint to sandbox and my app id to my sandbox key it will work without changing anything else. Further, in eBay's API test tool I cannot get their test tool to return success on this item (or any item) using production keys.
Is this a bug?