Mexico CFDI 4.0 Invoicing connects your Shopify store to an authorized PAC (Proveedor Autorizado de Certificación) so every sale can become a properly stamped CFDI 4.0 fiscal document the SAT recognizes. This is not an instant App Store install — ECOSIRE builds the integration to your store's fiscal profile (your RFC, régimen fiscal, certificate of CSD, and product–SAT catalog mapping), installs it, and supports it.

The build subscribes to Shopify order webhooks (orders/create, orders/paid, orders/cancelled) and reads order, line-item, tax and customer data through the Admin GraphQL API. When a customer needs an invoice, they enter their RFC, fiscal name, régimen fiscal and código postal in a hosted self-invoicing portal linked from the order-status page and confirmation email. The integration validates that fiscal data, maps each line item to the correct clave de producto/servicio and clave de unidad, applies IVA correctly, and requests a stamp from your PAC. The certified XML and a print-ready PDF are stored against the order (using order metafields) and emailed to the buyer.

It also handles the real-world cases: global "público en general" invoices for un-invoiced sales, cancellations with the required SAT acceptance flow, and credit notes (CFDI de egreso) for refunds and returns. POS and online orders are both supported through the same order pipeline and multi-location data.

Because it is build-to-order, you tell us your PAC, catalogs and edge cases, and we deliver a working, documented integration — no generic one-size-fits-all app. ECOSIRE provides the source, the install, and ongoing support.