: A plugin or "feature" for a third-party software (like an ERP or shipping manager) designed to communicate specifically with Auchan's systems.

: In many technical contexts, "x" refers to a multiplier or a quantity. This could imply a batch of 44 files or a specific version/format type.

: Sending product lists to a specific store management system.

If this is a feature you encountered in a specific app, could you share the or the task you were performing? That would help narrow down exactly what the "44x" format does for you.