Mexican e-invoicing guides for CFDI 4.0.
To choose an invoicing system, understand stamping and PACs, work out what invoicing costs, and integrate the Factura Digital API.
Invoicing and the SAT
- 01
Best CFDI invoicing system: 2026 guide
Eight criteria to compare CFDI 4.0 systems, and what suits freelancers, SMBs, accountants and enterprises.
- 02
What is a PAC and how to choose one
What a PAC does when it stamps, how to check the SAT's list to confirm it's authorized, and when a direct PAC makes sense.
- 03
How much invoicing costs in Mexico
What a stamp (folio) is, how invoicing systems charge and how to work out your real cost per invoice.
- 04
CFDI stamping system
What stamping is, what a PAC does and what to check in a stamping system.
API guides
Use cases for API v5 with JSON examples. Test for free in the sandbox.
- 01
Carta Porte 3.1 API
Stamp income and transfer CFDIs with Carta Porte from your own system; SAT rules are checked before stamping.
- 02
Payment complement (REP) API
Stamp the electronic payment receipt (Pagos 2.0) with JSON, including installments and several invoices in one payment.
- 03
CFDI cancellation API
Cancel CFDI 4.0 with reasons 01 to 04, replacement folio and SAT acknowledgment. Cancelling doesn't use a stamp.
Create your account and stamp with 10 free stamps.
One time only, no credit card. The stamps you buy never expire.