What is SUIT

SUIT Billing is a REST API multi-tenant platform for electronic invoicing in Peru (SUNAT). It allows you to emit invoices, receipts, credit notes, debit notes, retentions, perceptions, and despatch notes — all digitally signed, sent to SUNAT, and with automatic PDF generation.

What SUIT handles for you

• XML UBL 2.1 generation — Standard required by SUNAT
• Digital signature with your SUNAT certificate (.pfx)
• SOAP communication with SUNAT servers
• CDR (Constancia de Recepcion) parsing — Automatic interpretation of SUNAT responses
• PDF generation — Printable documents for your customers
• Automatic email delivery — Send PDFs to your customers automatically
• Accounts receivable (CxC) — Auto-generated when invoices are accepted
• Payment tracking and reminders — Keep track of who owes what
• Financial dashboards and Excel exports — Reporting tools

Architecture

Your App  -->  SUIT API  -->  SUNAT
                 |
              Signs XML --> Sends SOAP --> Parses CDR
                 |
              Stores document, generates PDF, sends email
                 |
              Auto-creates receivable (CxC)

Supported document types

Code	Type	Endpoint	SUNAT Method
01	Factura	POST /api/invoices	sendBill (sync)
03	Boleta de Venta	POST /api/receipts	sendBill (sync)
07	Nota de Credito	POST /api/credit-notes	sendBill (sync)
08	Nota de Debito	POST /api/debit-notes	sendBill (sync)
09	Guia de Remision	POST /api/despatch-advices	sendBill (sync)
20	Retencion	POST /api/retentions	sendBill (sync)
40	Percepcion	POST /api/perceptions	sendBill (sync)
RA	Comunicacion de Baja	POST /api/voided-documents	sendSummary (async)

Environments

Environment	Base URL	Purpose
Production	https://api.suit.pe	Live documents sent to SUNAT
Sandbox	https://api-staging.suit.pe	Testing with SUNAT beta servers

The sandbox environment uses SUNAT beta credentials (MODDATOS / MODDATOS) and does not generate real tax documents.

Next steps

1. Register and get your API Key
2. Emit your first invoice in 5 minutes
3. Learn about authentication