Research should be done also in how possible is to do the whole order fulfillment, even payment through that. The payment part doesn’t look so possible considering how most payment providers operate, there might be also security issues which browsers themselves might be blocking our processes (browsers prohibit Cross origin resource sharing, cookie sharing, mixed content between http and https)
How to connect/ match merchant’s product catalogue with affiliate site’s existing and new content? Example they have 100 reviews and we have 200 products, or they make reviews first and we add those products later.