Abstract: A network based order fulfillment system having an improved user interface at devices associated with multiple customers collaborating to place and pick up an order with a retailer. The system allows users of multiple devices to coordinate fulfillment of an order through communication with one or more user devices located at a fulfillment location to fulfill orders placed by users of other user devices. An alternate pickup person having a first user device can be associated with an order placed by a different user having a different user device. The user who placed the order can provide identifying information for the alternate pickup person to authorize the alternate pickup person to pick up the order.