An order is placed by a purchaser at a client system and received by a server system. The server system receives purchaser information including identification of the purchaser, payment information, and shipment information from the client system. The server system then assigns a client identifier to the client system and associates the assigned client identifier with the received purchaser information. The server system sends to the client system the assigned client identifier. The client system receives and stores the assigned client identifier. In response to an order indication, the client system sends to the server system a request to purchase the identified item. The server system receives the request and combines at least one previous purchase associated with the client identifier of the client system to generate a single order for billing and shipment.