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If you want to send and receive Polish e-invoices, you will need to connect Billit with KSeF, the National e-Invoice System of Poland.

First you will need to identify yourself and then generate a certificate to connect KSeF and Billit. The process for generating a certificate and connecting to KSeF differs slightly depending on whether you are using the production or test environment.

Follow the steps below to get started.

Authenticate with the National System of e-Invoices

1. Go to the website of the National e-Invoice System.
   • For production, use https://mcu.mf.gov.pl/web/login
   • For testing, use https://web2te-ksef.mf.gov.pl/web/
2. Click the “Authenticate in the National System of e-Invoices” tab.
3. For the option 'Choose an ID', select 'Company NIP' number (Tax Identification Number) and click 'Authenticate'.
4. Now you will need to choose your login method. Select 'Qualified certificate'. Make sure the option 'Yes' is checked to the question 'Is the certificate a signature with an NIP or PESEL number?' and click 'Next'.
5. Now choose 'Signature with NIP' from the dropdown under 'Authentication'. Enter the same 'NIP number' as before. Now confirm by clicking the 'Authenticate to the application' button.

Apply for a KSeF certificate

1. In the left-hand menu, choose “Certificates” and select “Apply for a certificate”.
2. Fill in a certificate name (minimum 5 characters).
3. You do not need to select a role when using a certificate.
4. When you're ready, confirm by clicking the “Generate” button.
5. Save the .key and .crt files safely, along with the certificate password.

You can revoke a certificate manually from the 'List of certificates' in the left hand menu. Select the certificate and click 'Revoke'.

Connect Billit and KSeF

1. Go to your Billit account and log in
2. Go to "Settings" > "Integrations" and look for the "KSeF" tile
3. Click on the "Available" button. You will now need to fill in three fields:
   1. The private key (.key file)
   2. The certificate (.crt file)
   3. Identification: Fill in your NIP number
   4. Identification type: Enter 'onip'
4. Confirm by clicking the "Save" button.

KSeF and Billit are now connected. You can start sending your first invoice.

All sales invoices sent from Billit via KSeF will also appear in the KSeF environment. Purchase invoices you receive via KSeF will now also appear in 'Fast input' in Billit.