Get your SAT acuses and líneas de captura by API

What you can build on SAT

• Get a declaration's acuse and línea de captura

  Build this

  Opens Reimprime tus acuses de declaraciones presentadas, picks the tipo de declaración, enters the número de folio and reads the acuse de recibo.

  Takes

  Tipo de declaración, número de folio

  Returns

  RFC, tipo de declaración, número de folio, línea de captura, importe total a pagar, fecha de vigencia

• Read monthly totals from the Visor de facturas

  Build this

  Reads the Visor de facturas emitidas y recibidas for one month: the importe total acumulado of vigentes facturas that SAT uses to prefill ISR and IVA.

  Takes

  Ejercicio, mes

  Returns

  Ejercicio, mes, total of facturas emitidas, total of facturas recibidas, currency

• Send a reviewed monthly declaration

  Build this

  Fills in the declaración provisional o definitiva in Declaraciones y Pagos for one period with figures you approved, sends it and reads the acuse.

  Takes

  Ejercicio, periodo, obligaciones, amounts per obligation

  Returns

  Número de folio, línea de captura, importe total a pagar, fecha de vigencia

Automate SAT with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• Línea de captura to accounting after each filing

  Build this

  Starts

  When your system calls the workflow's webhook with a tipo de declaración and folio

  Step 1

  Get the acuse de recibo for that tipo de declaración and número de folio.

  Step 2

  Stop when the importe total a pagar is zero.

  Step 3

  Post the línea de captura, importe total a pagar and fecha de vigencia to your accounting system's webhook.

• Invoice totals for last month, before the day 17 filing

  Build this

  Starts

  Monthly on the 5th at 9:00, Mexico City time

  Step 1

  Read the Visor de facturas totals for the previous month.

  Step 2

  Compare them with the totals from the last run.

  Step 3

  Email you the facturas emitidas and recibidas totals for the month.

• Reminder of líneas de captura about to expire

  Build this

  Starts

  When your system calls the workflow's webhook with folios and their tipos de declaración

  Step 1

  For each número de folio, get the acuse de recibo for its tipo de declaración.

  Step 2

  Keep the ones whose fecha de vigencia is within the next 3 days.

  Step 3

  Email you each línea de captura with its importe total a pagar and fecha de vigencia.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get a declaration's acuse and línea de captura” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "ptscdecprov.clouda.sat.gob.mx/get_declaration_acuse",
    "input": {
      "tipo_declaracion": "Pagos provisionales o definitivos",
      "numero_folio": "48210375"
    }
  }'

{
  "status": "completed",
  "data": {
    "rfc": "ACM010101AB1",
    "tipo_declaracion": "Pagos provisionales o definitivos",
    "numero_folio": "48210375",
    "linea_captura": "0426 0ZXA 7741 0583 2196",
    "importe_total_a_pagar": 184320,
    "fecha_vigencia": "2026-11-17"
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

SAT’s own options

SAT's service pages describe filing provisional and definitive declarations online in the Servicio de Declaraciones y Pagos, with your RFC and contraseña or e.firma, and describe no API for it. The DIOT also takes a carga batch file built to SAT's instructivo. Payment is made at an authorized bank with the línea de captura from the acuse.

Read on November 12, 2026: Presenta tus pagos provisionales o definitivos de personas morales, Presenta tu DIOT-), Contribuciones que puedes pagar con línea de captura.

Signing in to SAT

SAT signs you in as one RFC, with its Contraseña or with its e.firma, a certificate. With Fous you sign in once through SAT's own sign-in with your own account: the login is sealed with AES-256, never returned by the API or written to logs, and a method reads and does only what that RFC can.

Worth knowing

Day 17, plus days by RFC digit

Monthly payments of personas morales are due by day 17 of the following month. The sixth numeric digit of the RFC adds one to five business days: 1 and 2 add one day, 9 and 0 add five.

The línea de captura expires

The acuse de recibo shows the línea de captura, the importe total a pagar and its fecha de vigencia. Pago referenciado SAT at your bank works only within that vigencia.

The bank issues a Recibo Bancario

After you pay, the bank issues a Recibo Bancario with the línea de captura and the número de operación. The payment is made with the línea de captura from the acuse.

Visor totals are in pesos, vigentes only

The Visor de facturas, for the Régimen Simplificado de Confianza, adds up the vigentes CFDI 3.3 and 4.0 invoices issued and received each month, in moneda nacional, to prefill ISR and IVA.

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