When are buyers allowed to cancel their orders?

Poshmark allows for cancellations within 3 hours of order due to "buyer regret" and for fraud check reasons.  This is why orders are not sent to any 3PL orders aggregator (e.g., DSCO / Rithum) until 3 hours after the order is placed.

Buyers are also allowed to cancel if their order on Poshmark has not moved to Shipped status by the 8th day.

Sellers can cancel orders at any time after they have reached DSCO / Rithum (if integrated) or at any time for manual sellers, so long as the order has not yet transitioned to Shipped status.