After installing the plugin, you can configure it in your backend and put it into operation. Under Settings → General Settings → Additional Settings → fiskaltrust for Pickware POS, you first need to enter the CashBox ID and the CashBox AccessToken.
You can find this information in the fiskaltrust.Portal under the menu item Configuration → Cashbox:
If you operate multiple branches, you can accordingly enter a different CashBox ID and the corresponding CashBox AccessToken for each subshop.