After logging in to the Financial Administration portal www.financnasprava.sk and setting up your company, select "Authorized services > eKasa" in the tiles at the bottom right. A new window will open with the "E-Kasa zone" page.
Click on “Credential Requests” in the left menu
Press the dark button at the top “New Credentials”
Scroll to the very bottom of the page and check the box in the "Select" column next to your eKasa cash register code starting with 888…
At the bottom of the table, there is a form to fill in the "Password" for new authentication data. Fill it in, then repeat the password in the "Confirm password" field and press the "Create" button. It will refresh the page and create a request. The data is generated within about 5 minutes.
The next step is to download the identification and authentication data, instructions can be found here.