Some 3rd party suppliers use the certificate technology. So you will need to have a downloaded certificate in order to login.
1. In the Credential view you press the + sign
2. Give it a name
3. In type use the drop down and choose Certificate
4. Write a description and save and then refresh the page.
5. Press Set Certificate and you will get a pop up where you fill in password and download the certificate
Tab and the OK button will turn green. Press OK -> and press Save.
In the field Credentials in integration the name you wrote in "ID" will now be shown in the drop down list and can be used.
Note: The permission 'Modity Secrets' is needed to perform creation of a new Credential.