I have been selling on Mercari for years and never had a problem until march. A buyer with a fake account bought an item then reached out to Mercari stating he never received it. I got proof of delivery including time of delivery yet Mercari refunded the buyer. They also refused to delete my account until I filed a complaint. Mercari has a 1.3 negative star rating for a reason. Go elsewhere. I learned the hard way that seller shipping protection doesn’t exist nor does proof of delivery. If you want to work with a company that will not honor their word ,then join. I have emails from support claiming I am protected for shipping yet they turn around and claim otherwise. I showed all emails to the BBB yet Mercari claims ignorance. If you want to lose money and not be supported- only buyers are- then join Mercari.