Once you purchase the listing it will be marked as purchased, the vendor has 48 hours to complete the order by sending the digital item then marking the order as shipped otherwise the order will be cancelled.
Once the order has been marked as shipped the buyer can either finalize the order once they have received the purchase, dispute the order if there is a problem or extend escrow if required.
If the buyer does nothing once the order is marked as shipped it will auto-finalize after being marked as shipped for 21 days.