Looks awesome Chris... what do you think your moat/defensible advantage is though? Can't Amazon or Shopify just replicate what you do with their network of retailers/sellers?
It would be unlikely for Shopify to build integrations with other back office systems that compete directly with Shopify (e.g. BigCommerce), so there'd be a cap on the amount of integrated trade that could happen. A defensible trade network would need to be independent and connect to any system that buyers and sellers use. We'll just keep making it easier for businesses to trade irrespective of the systems they use and their preferred sales channels (e.g. dropship, wholesale, etc.).