Abstract: Systems and related methods are disclosed that provide an electronic commerce and communication system that includes real-time product inventory information to enable a customer-driven experience for reservation of products. An electronic commerce exchange is provided that permits customers to browse, search, and reserve products for in-store pickup across multiple merchants, each potentially with multiple retail locations. The exchange includes a real-time product inventory database that maintains real-time product inventory information for the retail locations of the merchants. The product inventory database includes ingest engines that permit an interface to different inventory transfer protocols so that product inventory information can be maintained across disparate inventory systems maintained by different merchants.