Check out balancedpayments.com. It's a processing, escrow, and payouts in one API. Also the founding team were early employees at Milo.com and worked on this specific issue of SKU level data cataloging & matching.
disclosure: I'm a co-founder of Balanced and this is a shameless plug for my product. :)
I was also the head of data acquisition at Milo.com and am fascinated by this problem. I have to admit I'm skeptical this scale of product matching and metadata cleaning can be done, but I'm very happy for you if you've succeeded where I failed. In either case, best of luck.
disclosure: I'm a co-founder of Balanced and this is a shameless plug for my product. :)
I was also the head of data acquisition at Milo.com and am fascinated by this problem. I have to admit I'm skeptical this scale of product matching and metadata cleaning can be done, but I'm very happy for you if you've succeeded where I failed. In either case, best of luck.