Learn About the KSEF Token and How to Use It

As Poland moves toward mandatory electronic invoicing, understanding how the National System of e-Invoices (KSeF) works has become essential for businesses and accounting professionals. One of the most critical components of this system is the KSeF token, a secure digital authentication method that allows external software to communicate directly with KSeF.

In this article, you will learn what the KSeF token is, how the KSeF access token works, and how to generate and use a KSeF token for smooth and secure ERP integration.

Key Takeaways

• A KSeF token is required for secure API access to Poland’s e-Invoice system

• KSeF 2.0 tokens are mandatory for ERP integrations starting February 1, 2026

• Tokens do not expire but must be stored and protected carefully

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What Is a KSeF Token?

A KSeF token is a 40-character alphanumeric code used for digital authentication within Poland’s National System of e-Invoices. In simple terms, it acts as a secure access key that allows accounting or ERP systems to issue and receive invoices without logging in manually each time.

If you are searching for what is KSeF token or czym jest token KSeF, the answer is straightforward: it is a token dostępu KSeF that replaces repetitive logins and ensures secure communication with the Ministry of Finance systems.

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How KSeF Token Digital Authentication Works

KSeF token digital authentication is based on token-based API access. Instead of using a Trusted Profile (Profil Zaufany) or qualified signature for every session, the ERP system authenticates itself using the token.

Here is how KSeF token work in practice:

• The token identifies your company and assigned permissions

• Each API request is verified by KSeF using the token

• Only authorized actions, such as invoice issuance or download, are allowed

This method improves security, automation, and system reliability.

KSeF Access Token in KSeF 2.0

With the introduction of KSeF 2.0, access tokens play an even more important role. Tokens generated for KSeF 1.0 will not work in the new system.

Key facts about the KSeF access token in version 2.0:

• Required for the mandatory invoicing rollout on February 1, 2026

• Available since December 10, 2025

• Essential for automated ERP and accounting workflows

Without a valid token, invoices cannot be sent, received, or confirmed (UPO).

How to Generate KSeF Token

If you are looking for how to generate KSeF token or jak wygenerować token KSeF, follow these steps:

• Log in to the KSeF portal using a Trusted Profile or Qualified Signature

• Go to the Tokens (Tokeny) section in the side menu

• Select Generate token (Generuj token)

• Assign permissions such as:

  • Access to invoices

  • Issuing invoices

• Confirm token generation

• Copy and securely save the token immediately

The token is displayed only once and cannot be recovered later.

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How to Use a KSeF Token in ERP Systems

Knowing jak korzystać z tokenu KSeF is especially important for ERP and accounting teams.

Once generated:

• Paste the token into your ERP or accounting software

• Configure invoice sending and receiving functions

• Test the connection to ensure successful authorization

Tokens are commonly used by accounting firms managing multiple clients and by companies relying on automated invoicing processes.

Security and Best Practices

Because a Token KSEF functions like a password, security is critical:

• Never share the token with unauthorized users

• Store it in a secure password manager or encrypted vault

• Revoke tokens immediately if compromise is suspected

• Limit permissions to only what is necessary

A compromised token can expose invoice data and disrupt business operations.

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Conclusion

The KSeF token is a fundamental element of Poland’s electronic invoicing ecosystem. From digital authentication to ERP automation, it enables secure, fast, and reliable invoice exchange. 

As KSeF 2.0 becomes mandatory, understanding how KSeF token works and how to generate and use a KSeF access token is no longer optional—it is a necessity for compliance and operational efficiency.

FAQ

What is a KSeF token used for?

It allows ERP systems to securely send and receive invoices via the KSeF API.

Does a KSeF token expire?

No, KSeF tokens do not expire unless manually revoked.

Can I view my token again after generation?

No, the token is shown only once and must be saved immediately.

Is a KSeF 1.0 token valid in KSeF 2.0?

No, tokens from KSeF 1.0 are not compatible with KSeF 2.0.

Who needs a KSeF access token?

Businesses, accounting firms, and ERP users who issue or receive invoices through KSeF.

Disclaimer: The views expressed belong exclusively to the author and do not reflect the views of this platform. This platform and its affiliates disclaim any responsibility for the accuracy or suitability of the information provided. It is for informational purposes only and not intended as financial or investment advice.