First, login to your Supertext AG account with your normal username and password:
Then click on Einstellungen below Konto.
Scroll all the way down until you see the part â€œAPI Authentifizierungs Tokenâ€
Here you see your token. Use this and your username in the system that sends requests to the Supertext API.
If you donâ€™t have an account yet, you can create one here: