Get your SIPARE capture lines through an API

What you can build on SIPARE

• Get pending capture lines for an RFC

  Build this

  Opens Generar Multilínea, enters your RFC and reads the líneas de captura (capture lines) for unpaid periods of each registro patronal (employer registration).

  Takes

  RFC

  Returns

  Registro patronal, period, capture line, amount

• Read a payment proposal

  Build this

  Reads the propuesta de pago (payment proposal) for one registro patronal and period: Datos Patronales, Detalle de los importes and the Línea de Captura.

  Takes

  Registro patronal, period

  Returns

  Employer name, registro patronal, period, IMSS amount, RCV amount, INFONAVIT amount, total, capture line

• Check a payment and its CFDI

  Build this

  Looks up a paid línea de captura in SIPARE and reads the payment's status and whether its CFDI for cuotas obrero patronales can be consulted yet.

  Takes

  Capture line

  Returns

  Capture line, registro patronal, period, payment status, payment date, CFDI available, forma de pago

• Update the forma de pago on a CFDI

  Build this

  Uses Línea de Captura - CFDI Actualización Forma de Pago to set a paid line's CFDI to Efectivo, Transferencia or Cheque.

  Takes

  Capture line, forma de pago

  Returns

  Capture line, previous forma de pago, new forma de pago, confirmation

Automate SIPARE 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.

• Pending líneas de captura for each RFC, emailed monthly

  Build this

  Starts

  Monthly on the 5th at 8:00, Mexico City time

  Step 1

  For each RFC you name, get the pending capture lines from Generar Multilínea.

  Step 2

  Stop when no registro patronal has a pending period.

  Step 3

  Email you the lines grouped by RFC, with registro patronal, period and amount.

• CFDI ready for paid lines, posted to accounting

  Build this

  Starts

  Every weekday at 9:00, Mexico City time

  Step 1

  For each capture line you list as paid this month, check the payment and its CFDI.

  Step 2

  Keep the lines whose CFDI is available now but was not on the last run.

  Step 3

  Post capture line, registro patronal, period, payment date and forma de pago to your accounting webhook.

• Payment proposal amounts for each registro patronal

  Build this

  Starts

  When your system calls the workflow's webhook with a period

  Step 1

  For each registro patronal you list, read the propuesta de pago for that period.

  Step 2

  Keep the IMSS, RCV and INFONAVIT amounts, the total and the capture line.

  Step 3

  Post the rows to your ERP webhook for the month's accrual.

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 pending capture lines for an RFC” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "sipare.imss.gob.mx/get_pending_capture_lines",
    "input": {
      "rfc": "ACM010101AB1"
    }
  }'

{
  "status": "completed",
  "data": {
    "rfc": "ACM010101AB1",
    "lines": [
      {
        "registro_patronal": "Y0000000101",
        "period": "2026-10",
        "capture_line": "0000 0000 0000 0000 0000 0000 0001",
        "amount": 184250.4,
        "currency": "MXN"
      }
    ],
    "count": 1,
    "total": 246230.55
  }
}

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.

SIPARE’s own options

IMSS publishes no API for SIPARE. Employers sign in to the portal to generate líneas de captura, then pay at a bank counter or in online banking at an authorized entidad receptora. The SUA program calculates the amounts and produces payment files or capture lines, and Generar Multilínea pays several lines in one transaction at some banks.

Read on November 12, 2026: SIPARE (IMSS), Nuevo SIPARE: Generar Multilínea, SUA (Sistema Único de Autodeterminación).

Signing in to SIPARE

SIPARE signs you in with a Usuario and Password. You register with the línea de captura from a propuesta de pago or a current SUA payment file, a valid email address for the confirmation and a password of at least 8 characters. With Fous you sign in once through SIPARE'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

CFDI from the fifth business day

The CFDI for a payment of cuotas obrero patronales can be consulted and printed from the fifth business day after the payment date, so a check for it belongs on a schedule, not right after paying.

Disagree with the proposal, make a new line

You can pay the Institute's propuesta de pago as it stands. If you do not agree with it, you generate a new línea de captura in SIPARE from your SUA payment file.

Multilínea works at some banks only

One transaction for all your lines is available at BBVA, Citibanamex, Santander, HSBC, BanBajío, Banca Mifel and Banorte, and at Banorte only through its online banking portal.

Three formas de pago on the CFDI

The accepted formas de pago are Efectivo, Transferencia and Cheque. The option Línea de Captura - CFDI Actualización Forma de Pago changes the one on a payment's CFDI.

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