Thanks for answering.
The problem is that it's not a traditional add-on, but a customized script automatically generated unique to each user, so we can not publish a generic version on the market page.
It doesn't even have to be installed into AbanteCart, since it hooks to the database directly, with no need for installation, and exports paid orders as shipments with all major shipping companies, through digital EDI, booking for pickup, printing of shipping documents, shipping notifications and track & trace.