ANSWER:

If you don’t possess the product, you can’t sell what you don’t own. The only permissible way is for the mother company that owns the product to allow you to sell it on their behalf for a specific price and give you a percentage from that as their agent or marketing person. 

I want to start an online business whereby i upload products from … …….(NB: with their permission because i got the API from them), add my profit and sell them. My question is: is this business permissible because i dont have any product in my possession. I just resell them.