Each individual will determine the products they want to use within their E-commerce application. In other words, you will upload unique products for your specific E-commerce application and conduct transactions using only your own products. Everyone's products will be used exclusively within their own app and will not be mixed with others.
When adding a product, you'll give the "store" column a unique name (think of it as your store). Later, when you make a request in the application, you will send this "store" parameter in the Header.