Uruguay Invoice MCP Server

Uruguay Invoice MCP

Remote MCP server that lets any AI agent submit Uruguay DGI e-Factura (Comprobante Fiscal Electrónico, CFE) documents to the DGI facturación electrónica webservice. It is a stateless forwarder: the CFE signature, the Sobre signature and the WS-Security SOAP signature all stay merchant-side. Bring your own Uruguayan CA certificate; nothing is stored.

• Endpoint: https://inv-uy.wishpool.app/mcp (MCP Streamable HTTP)
• Region: gru1 (São Paulo) · License: MIT
• Registry: app.wishpool/uruguay-invoice-mcp

The signing boundary (read this first)

DGI requires message-level WS-Security: every submission is a SOAP message whose Body is X.509-signed with the merchant's Uruguayan CA certificate (e.g. from Correo Uruguayo), and each CFE and the Sobre carry their own XML digital signatures. All of that happens on your side, with your private key, which never leaves your side.

This server does not sign and does not store anything. You hand it the finished, WS-Security-signed SOAP envelope (base64); it adds the SOAPAction header, POSTs it to the chosen DGI endpoint, and translates the DGI acknowledgement. This is the same "you sign, we forward" model as the sister Saudi ZATCA and Costa Rica Hacienda servers.

This mirrors how DGI itself behaves: an unsigned POST to the live ePrueba endpoint is rejected with a DGI-signed SOAP Fault — <Detalle>No signature in message!</Detalle>. The signature is mandatory and is yours to produce.

Tools

Typical flow

1. calc_iva → get the CFE MontosTotales.
2. Build and sign the CFE, build and sign the Sobre (merchant-side).
3. build_cfe_envelope → get the exact SOAP Body.
4. WS-Security-sign that envelope with your certificate, base64-encode it (merchant-side).
5. submit_sobre → forward. On estado AS, keep the returned consulta_token.
6. query_envio_status later → fetch the per-CFE 2nd message. Send the daily report with submit_reporte_diario.

Configuration (headers, per-request, nothing stored)

• x-dgi-mode: test (default — DGI ePrueba sandbox, no fiscal effect, verified live) · homologacion · produccion.
• x-dgi-endpoint: an explicit https:// DGI webservice URL (overrides x-dgi-mode).
• x-agentpay-allowed-tools: owner-set tool allow-list (the agent cannot relax it).

Endpoints

Do I need to be a "Proveedor Habilitado"?

No. The Registro de Proveedor Habilitado is DGI's optional simplified-onboarding scheme for commercial software vendors — it requires being declared a software provider by at least five electronic issuers and holding the software-vendor activity codes (46510 / 62010 / 62020 / 63110). A merchant issuing its own CFEs onboards through the ordinary ingreso al régimen as an emisor electrónico with its own software; no vendor registration is required. This server is only a transport layer for documents you have already signed.

Honest limitations / boundaries

• We never sign. If your envelope lacks a WS-Security signature, DGI rejects it (No signature in message!); the server surfaces this and blocks an obviously-unsigned envelope before it even reaches the network.
• Amount policy cap is not enforced on submit. The submitted envelope is an opaque signed blob; the grand total lives in each CFE's MontosTotales inside the signed body. Apply x-agentpay-max-amount logic at the calc_iva / build stage (pre-sign). The tool allow-list guardrail does apply to every call.
• test is the only endpoint verified live from here. homologacion / produccion URLs are the documented DGI ones but must be confirmed against your onboarding materials (or overridden with x-dgi-endpoint).
• calc_iva covers the common Básica/Mínima/Exento breakdown, not every special indicator (exports/assimilated, perceptions, etc.).

Develop / test

npm run dev    # local server on http://localhost:3245
npm test       # e2e: protocol + IVA math + local helpers + validation + policy + LIVE DGI ePrueba assertions

The e2e suite hits the real DGI ePrueba endpoint: it asserts the WSDL is 200 with the three operations and that a fake-signed envelope round-trips to a DGI SOAP Fault (endpoint alive + fault passthrough).

Safety

Stateless forwarder. The signed SOAP envelope travels per-request and is never stored; no credentials, documents, or customer data are persisted. Privacy: https://inv-uy.wishpool.app/privacy

Family

Invoices: Saudi ZATCA (inv-sa), Chile DTE (inv-cl), Mexico CFDI 4.0 (inv-mx), Peru CPE (inv-pe), Brazil NF-e (inv-br), India GST (inv-in). Local payments in 81 countries — https://mcp.wishpool.app.