Poshmark holds all orders for 3 hours before sending them to a 3PL integration partner, such as DSCO or Rithum. This 3 hour hold is intended for two reasons:
If a buyer purchases via "Buy Now" on Poshmark, they are granted a 3-hour grace period where they can cancel due to Buyer Regret reasons. By holding orders for 3 hours, this reduces the potential opportunity for a Cancelled but Shipped order.
For seller safety, Poshmark performs fraud checks on all orders - a process which requires ~3 hours. If an order is flagged as high-risk, we may hold the order up to 24 hours to perform more robust analysis.