KSeF - SCANYE - Subiekt123 full guide to integration from February 2nd, 2026
Log in to the KSeF application
Please use this link to log in.
Log in with Profil Zaufany
If you choose another method to log in, the process may be different.
Enter the tax ID number of the company you are acting on behalf of, then identify yourself by clicking on the "Uwierzytelnij" (Authenticate) button.
Then sign your authentication document:
Select the "Profil Zaufany" option. Additional options are also available, but are subject to certain prerequisites.
Jelentkezz be:
You must confirm your login with an SMS code or a mobile banking app.
After logging in, you must confirm your signature with an SMS code or a mobile banking app.
After successfully logging in, the KSeF interface will look like this:
KSeF Permissions (Uprawnienia)
In the case of sole proprietorships, the entrepreneur, as the administrator, is automatically connected for issuing and receiving invoices.
In the case of partnerships, the administrator must be designated on the ZAW-FA form submitted to the tax office.
A KSeF Jogosultságokról és beállításukról egy jövőbeni cikkünkben írunk részletesen.
Request a certificate
Once this has been done, proceed to the next step.
After logging in to KSeF, select Certyfikaty (Certificates) / Wnioskuj o certyfikat (Apply for a certificate) from the menu.
1. Name your certificate
2. Set up a strong password to your certificate
It is not possible to change or reset the password used for the certificate. If it is lost, a completely new certificate must be generated.
Currently, the KSeF system allows one certificate to be generated every 30 days per person and per entity.
3. Repeat your password
4. Click on the "Generuj" button
When you generate the certificate, a *.key private key file is created, which you will find among the downloaded items by default.
Save the downloaded private key file to a secure location on your computer.
After downloading the private key, in the second step, enter the purpose of the certificate: "Uwierzytelnienie w systemie KSeF" (Authentication in the KSeF system)
Enter the current date as the start of the validity period so that the certificate can be used immediately.
Click on "Wyślij wniosek o wydanie certyfikatu" (Send certificate request).
Download the certificate
Once you have your *.key private key, download the *.crt certificate file as well.
Save the downloaded certificate files to a secure location on your computer.
It is not possible to change or reset the password used for the certificate. If it is lost, a completely new certificate must be generated.
Currently, the KSeF system allows one certificate to be generated every 30 days per person and per entity.
Choose "Lista Certyfikatów" from the menu
Select the desired certificate and click on "Pobierz certyfikat" and then "PEM Certyfikat."
The certificate *.crt file is placed in the default Downloads folder.
Authentication in SCANYE
In the pop-up window, select the "Certyfikat KSeF" (KSeF Certificate) option instead of Token!
- Upload the KSeF certificate *.crt and *.key files (1, 2).
- Enter the password used when creating the certificate (3)
- and click on the "Zaloguj" button.
If the certificate, key, and password belong together, you can use the SCANYE functions according to your permissions specified in KSeF.
After entering the correct password, the connection is established. Invoices issued on the SCANYE interface can be sent to KSeF, and purchase invoices sent to KSeF will appear on the SCANYE interface.
Authentication in Subiekt123
Log in to Subiekt123 with your InsERT account (Konto InsERT).
In the upper right corner of the window, click on the KSeF icon.
Click on the "Konfiguracja"(Configuration) menu, then select the "Połączenie z KSeF" (Connection with KSeF) line and click on the "Połącz" (Connect) button.
Confirm your authority by logging into your InsERT account.
Upload the certificate (*.crt) and the associated private key (*key) file.
Enter the certificate password in the field labeled "Wpisz hasło" and submit the form using the button at the bottom.
If the certificate, key, and password match, you will be able to use the Subiekt123 functions in accordance with your KSeF permissions.
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