Is selling products to customers after collecting their price and then purchasing them for them at the same price, while receiving a commission from the company, considered selling what one does not own, or is it an agency for purchase in exchange for a commission?

The work mentioned, which involves displaying product images online, collecting customer orders, then purchasing the product and having its invoice issued in the customer's name, and receiving a commission from the company, is permissible brokerage (simsarah mubahah), and not a case of a person selling what he does not own.