How to set up the KSeF fiscal registry integration in Mews Operations

Legal Environments

Hotels in Poland can use the KSeF fiscal registry integration from Mews Marketplace to automatically send eligible business invoices through the KSeF platform, ensuring compliance with local legal requirements.

You set up the integration directly from the Mews Marketplace by entering your company’s legal information, uploading proof of ownership, and activating the connection. Once approved, Mews starts fiscalizing all eligible invoices for your company.

 

Required data

Buyer required data to be provided during integration setup:

  • Legal company/entity name

  • Legal company/entity full address

  • Legal company/entity tax identifier (NIP)
    Note: You enter only the digits of the tax identifier.

  • Email address

For KSeF, you must also ensure:

  • Your company details are complete, including registered name, address, and NIP

  • You upload your KSeF certificate, private key, and password

 

ⓘNote

  • Ensure all data is correct when you create the integration. Verify Company name, Address, and Tax identifier contain no extra characters or spaces. You cannot modify this later.

  • The company name and address must be the official registered legal entity.

  • After uploading proof of ownership, approval may take up to 72 hours. Once approved, you receive an email and a task notification confirming the integration is ready and the system accepted the document.

  • If the system rejects proof of ownership, you are notified by email and task with the refusal reason. You must upload a new proof of ownership document.

For Poland:

  • You obtain the KSeF certificate directly from the Polish Ministry of Finance. Mews does not provide this certificate.

  • You are responsible for complying with KSeF requirements. Mews provides integration support but does not replace your legal or tax obligations.

 

To set up the KSeF fiscal registry integration in Mews Operations

In Mews Operations:

  1. Go to the main menu > Marketplace.

  2. Enter KSeF fiscal registry integration into the search bar.

  3. Click Explore > Subscribe.

  4. In the KSeF fiscal registry integration settings, complete the following fields:

  • Name: Enter the name of the integration.

  • Company name: Enter the full legal name of your company.

  • Tax identifier: Enter the registered company tax identification number (NIP).

  • Email: Enter the company email address.

  • Address line 1: Enter the number and name of the street where your business is legally registered.

  • Address line 2: Enter any additional address information.

  • City: Enter the city where your legal business address is located.

  • Postal code: Enter the postal code that matches your legal business address.

  • Country: Select Poland from the dropdown. This field is fixed to ensure compliance with local fiscal regulations.

  • Invoice PDF: Check the Attach PDF file to e-invoice box to include a PDF version of the file.

 

For KSeF, also upload:

  • KSeF certificate

  • Private key

  • Password

  1. Click Connect.

  2. In the Mews Marketplace, click My subscriptions.

  3. Locate the KSeF fiscal registry integration and click Edit.

 

Under Proof of ownership, upload your proof of ownership document to verify registration in the KSeF system. For example, official company registration documents.

Note: You cannot use copies of public records to verify proof of ownership.

 

  1. Click the Enable checkbox.

  2. Click Save.

This sets up the KSeF fiscal registry integration in Mews Operations. To check the status of your integration approval, Mews displays a connection summary message at the top of the integration Settings screen.

Once the integration is active and the system approves proof of ownership, Mews starts sending eligible invoices to KSeF automatically.

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