Can my products get displayed on the website in the order of options I register? No, they can't. The products will be exposed on the front (sales page) in the order of Coupang's own logic. Related articles When modifying a product using the API, an error occurs ‘Required options (weight per piece, other) have not been entered.’ Guide to Creating Product Listings I don't understand what each ID means. What are the rules for search keywords for product listing? I get the following error: "Could not change the sales price. You can change within the range between: up to 50% lower - up to 100% higher than the previous sales price before the change."