Add Rakuten Popshops API to multi-merchant marketplace

Hello, I would like to connect Rakuten POPshops API Pop shops documentation [login to view URL] with my multi-merchant marketplace. [login to view URL] The marketplace would be a hybrid, since some merchants can sign in and have their own store and part of our payment process, and the other part is the Affiliate program through Rakuten POPshops. The affiliate shops would need to connected with JSON file with Rakuten API. -I would like that each affiliate retailer have its own online shop on the marketplace. - Possibly some fiddling with the category section of the site to correspond with API -These shops should also appear in the store directory on the site. - The site must look and feel uniform. No difference between the affiliate shops that link to the retailers site, from the merchants whom have an account with the site. thank you