Machine, methods, and computer program encoded on non-transitory memory for facilitating electronic inventory tracking and management of products through messaging over an existing financial services payment network are provided. An example includes an inventory management computer in communication with a merchant POS apparatus or terminal over an existing financial services payment network and configured to receive and process purchase transaction data associated with a product being purchased. The computer can also include, for example, electronic inventory management computer program configured to perform various operations including generating product identifiers, forming product look up tables to correlate the identifiers with the products, and providing inventory data to product providers.