A method for communicating between an internal server system and an external warehouse system for a plurality of articles, the method including receiving an Inventory Snapshot Entity from the external warehouse system, selecting the one or more unique article identifiers from the Inventory Snapshot Entity to be included in an Order Entity, dropping the Order Entity to the external warehouse system, receiving a Return Entity from the external warehouse system, and in response to receiving the Return Entity, updating one or more article databases to indicate receiving one or more articles corresponding to the one or more unique article identifiers.