This plugin has been closed as of སྤྱི་ཟླ་དྲུག་པ། 2, 2022 and is not available for download. This closure is temporary, pending a full review.
There simply isn't any more work left that this plugin could do for me - it's done everything. My main issues with FoxyCart are validation (HMAC) and datafeed endpoint. FoxyShop takes care of both without me having to lift a finger. My needs are served - thank you guys!