Get your employees' e-ZLA from eZUS through an API

What you can build on eZUS

• Get sick-leave certificates (e-ZLA)

  Build this

  Reads the e-ZLA listed in Zaświadczenia lekarskie in the Panel Płatnika for an absence period you set.

  Takes

  Payer NIP, period from, period to

  Returns

  Employee name, identifier type, series and number, status, issue date, leave from and to, hospital stay, medical indication

• Find corrected, cancelled and retroactive e-ZLA

  Build this

  Reads Zaświadczenia lekarskie and keeps the e-ZLA whose status is Skorygowane (corrected), Anulowane (cancelled) or one of the Wsteczne (retroactive) statuses.

  Takes

  Payer NIP, issued since

  Returns

  Employee name, series and number, status, issue date, leave from and to

• Get one employee's e-ZLA

  Build this

  Reads every e-ZLA for one employee in Zaświadczenia lekarskie for a period, for checking sick pay before the payroll closes.

  Takes

  Payer NIP, employee PESEL or passport number, period from, period to

  Returns

  Series and number, status, leave from and to, hospital stay, insurance place, care relationship code

• Request a certificate of no arrears (RWN)

  Build this

  Fills in and sends the RWN request for a zaświadczenie o niezaleganiu (certificate of no arrears) from the payer account.

  Takes

  Payer NIP, electronic or paper delivery

  Returns

  Request type, sent date, confirmation of submission

Automate eZUS 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 e-ZLA handed to payroll each morning

  Build this

  Starts

  Every weekday at 7:00

  Step 1

  Get the sick-leave certificates (e-ZLA) for the current and previous month.

  Step 2

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

  Step 3

  Post employee, series and number, status, leave from and to to your payroll webhook.

• Corrected and retroactive e-ZLA to review

  Build this

  Starts

  Every weekday at 8:00

  Step 1

  Find the corrected, cancelled and retroactive e-ZLA issued in the last 30 days.

  Step 2

  Keep those that changed since the last run, and stop the run if there are none.

  Step 3

  Email you the list grouped by status.

• Monthly sick-leave summary for the payroll close

  Build this

  Starts

  On the 1st of every month at 7:00

  Step 1

  Get the sick-leave certificates (e-ZLA) for the previous month.

  Step 2

  Summarize the days of leave per employee, with hospital stays and cancelled certificates marked.

  Step 3

  Email you the summary.

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 sick-leave certificates (e-ZLA)” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "zus.pl/get_sick_leave_certificates",
    "input": {
      "payer_nip": "5250000000",
      "period_from": "2026-11-01",
      "period_to": "2026-11-30"
    }
  }'

{
  "status": "completed",
  "data": {
    "payer": "Acme Sp. z o.o.",
    "certificates": [
      {
        "employee": "Marta Lewandowska",
        "identifier_type": "PESEL",
        "series": "ZZ",
        "number": "4820117",
        "status": "Wystawione",
        "issued": "2026-11-09",
        "leave_from": "2026-11-09",
        "leave_to": "2026-11-16",
        "hospital_from": null,
        "hospital_to": null,
        "medical_indication": "may walk"
      }
    ],
    "count": 1
  }
}

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.

EZUS’s own options

ZUS offers payers one public web service: it returns the e-ZLA reports you schedule in eZUS, as password-protected ZIP files, for reports generated in the last 30 days. Insurance documents go to ZUS through the Płatnik program or ePłatnik in eZUS. Requests such as RWN and the rest of the payer panel are used in eZUS itself, which is free.

Read on November 12, 2026: Usługa do pobierania raportów e-ZLA dla płatników (ZUS BIP), Regulamin korzystania z eZUS, Zaświadczenia o niezaleganiu.

Signing in to eZUS

eZUS signs you in with your eZUS login and password, with a QR code scanned in the ZUS mobile app, or through login.gov.pl (Profil zaufany, banking, mObywatel, e-Dowód or eID). With Fous you sign in once through eZUS's own sign-in with your own login and password: the login is sealed with AES-256, and an expired session is signed back in.

Worth knowing

ZUS's own reports arrive a day later

ZUS generates the cyclic e-ZLA reports at night, and the first data arrives at the earliest the day after you set up the report schedule in eZUS.

The report service has its own login

ZUS's e-ZLA service takes the email and password set in the report schedule, not your eZUS login, plus the payer NIP. It returns only reports generated in the last 30 days.

A company is reached through a person

A company's data is opened by a person with their own confirmed eZUS profile and a power of attorney from the payer. The account you connect sees only the payers it holds that power for.

No-arrears certificates take up to 7 days

ZUS issues the certificate within 7 days of an RWN request, at once in clear cases, and refuses by decision when contributions are overdue. The electronic copy is an XML file with a qualified signature.

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