Turn the Portal Empresarial INFONAVIT into an API

What you can build on the Portal Empresarial

• Check a worker's credit procedure

  Build this

  Opens Mis trámites (my procedures), then Trámites de crédito, searches by NSS and reads the credit procedure your worker has started.

  Takes

  NSS

  Returns

  NSS, worker name, request date, Infonavit credit number, discount amount, waiting for your confirmation

• Get a worker's Aviso de Retención de Descuentos

  Build this

  Searches Trámites de crédito by NSS after the credit is formalized and reads the Aviso de Retención de Descuentos (discount withholding notice).

  Takes

  NSS

  Returns

  NSS, worker name, notice available, Infonavit credit number, discount amount, notice PDF

• List your workers' credit notices

  Build this

  Reads the Consulta de trabajadores (worker lookup) service, which lists the credit notices for all workers on your registro patronal.

  Takes

  Nothing

  Returns

  NSS, worker name, notice type, Infonavit credit number

• Get the Constancia de Situación Fiscal

  Build this

  Enters your RFC and full name in the Portal Empresarial and reads the Constancia de Situación Fiscal (statement of your standing with your Infonavit fiscal obligations).

  Takes

  RFC, full name

  Returns

  RFC, name, compliance status, certificate PDF

Automate the Portal Empresarial 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.

• New credit notices for payroll, every week

  Build this

  Starts

  Every Monday at 8:00, Mexico City time

  Step 1

  List your workers' credit notices in Consulta de trabajadores.

  Step 2

  Keep the notices that were not there on the last run.

  Step 3

  Post each one, with NSS, worker name, notice type and credit number, to your payroll system's webhook.

• Credit procedures waiting for your confirmation

  Build this

  Starts

  When your HR system calls the workflow's webhook with a list of NSS

  Step 1

  For each NSS, check the worker's credit procedure in Trámites de crédito.

  Step 2

  Keep the procedures that are waiting for your confirmation.

  Step 3

  Email you the list with NSS, worker name, request date and discount amount.

• Avisos de Retención ready to start withholding

  Build this

  Starts

  Every weekday at 9:00, Mexico City time

  Step 1

  For each NSS you have confirmed, check whether the Aviso de Retención de Descuentos is available.

  Step 2

  Keep the notices that became available since the last run.

  Step 3

  Post NSS, credit number and discount amount to your payroll system's webhook.

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 “Check a worker's credit procedure” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "empresarios.infonavit.org.mx/check_credit_procedure",
    "input": {
      "nss": "12345678901"
    }
  }'

{
  "status": "completed",
  "data": {
    "nss": "12345678901",
    "worker_name": "Ana Ejemplo Pérez",
    "request_date": "2026-11-03",
    "infonavit_credit_number": "2426000000",
    "discount_amount": 2875.4,
    "awaiting_confirmation": true
  }
}

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.

The Portal Empresarial’s own options

Infonavit's guide for the portal names two ways to get the credit notices of all your workers at once: the Consulta de trabajadores service in the portal, and the Servicio de Intercomunicación de Avisos, used from your payroll system. Credit confirmations, a single worker's Aviso de Retención and the Constancia de Situación Fiscal are done in the Portal Empresarial itself.

Read on November 12, 2026: Infonavit: Guía de usuario, Confirmación de trámites de crédito (copy), Infonavit: Guía de usuario, Constancia de Situación Fiscal (copy).

Signing in to the Portal Empresarial

The Portal Empresarial asks for your Número de Registro Patronal (NRP), the email address the NRP was registered with and your password. Confirming a credit procedure also asks for your current e.firma. With Fous you sign in once through the portal's own sign-in with your own account: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

One registro patronal per sign-in

You sign in with an NRP and the email it was registered with, so a method reads the workers of that registro patronal. A company with several NRPs signs in once for each.

Confirming needs a current e.firma

To confirm that you know about a worker's credit procedure, the portal asks for the e.firma of whoever runs payroll. If the e.firma has expired, the portal does not allow the confirmation.

The aviso arrives only after formalization

The Aviso de Retención de Descuentos can be downloaded once the credit is formalized, and you need it to start withholding from the worker's salary. Confirming in the portal replaces the paper Aviso de Retención por Originación.

Credits from the last 10 days of a bimester

A credit formalized in the last 10 days of a bimester may be missing its amount and discount factor in the next Emisión Bimestral. Infonavit says to take the data from the Aviso de Retención de Descuentos.

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