In the event that you can't complete a sale, you may be penalized in the form of a fee or restrictions to your account until you have successfully completed a sale. Multiple canceled sales can also result in StockX suspending your account.

StockX offers incentives in the form of reduced fees for sellers that have a good record of successfully completing sales. If you’re unable to complete a sale, it may impact your Seller fees.

For more information, refer to FAQ: What is the StockX Seller Program? 

If you're having issues completing a sale on time, you can Contact Us for more options by clicking the "Contact Us" button at the bottom of the Help Center page (or down below).