I am not certain, but I suspect eBay changed the way they disclose....or possibly they no longer disclose at all....the fees they charge for promoted listings (upgrade fees). If so, it may account for why mycostpro can no longer pull the API info for upgrade fees. Have you had any other reports of this? Or, perhaps your other users do not use that feature on eBay listings.
In March, that info was pulled for a number of my sales items; but in April and May that is missing. And, I am no longer able to find those fee amounts within eBay's site. Frustrating when I just need to "trust them" instead of "trusting and verifying." I just wondered if you have any other hints as to why this info seems to be unavailable. Thanks much.