Beveren-Software-Inc/mexico-einvoice ? reverse-engineered prompt

Build me an ERPNext app for businesses in Mexico that lets users generate, download, and cancel electronic invoices through FacturAPI.

I want it to feel like a smooth add on inside ERPNext, with a simple settings page where someone can paste their FacturAPI secret key and get started. The app should handle the Mexico invoicing flow cleanly, keep the required CFDI details in place, and make it easy for a user to create compliant e invoices without leaving ERPNext.

Please make it practical and easy to use, with clear status handling for invoice creation, download, and cancellation. If you need to check the latest ERPNext or FacturAPI docs while building it, go ahead and look them up online.