I've used mercari a hand full of times to buy and sell items. Since selling I've discovered that they don't offer a means for you as the seller to collect shipping. You have no choice but to use their label system and if by chance you have an issue with the label you could wait up to 2 days to have you issue resolved, 2 DAYS that your customer is going to have to wait for you to be able to provide tracking! If you don't want to use this faulty system you only have the option to have free shipping which you come out of pocket for! One of the most broken systems I've ever seen in a buying and selling service, FB sale is even better than this mess smh do not waste your time with mercari! I will be keeping my store on eBay!