CoinTracking supports the import of Bitcoin.de transactions.
You can perform an import either via the automatic API integration or via a manual CSV import.
For API imports you need to create an API key that you can insert into CoinTracking. You can learn how to do this here.
Follow the import instructions to download a CSV file from the exchange or wallet and then upload it to CoinTracking to import all transactions.
Please note that the Bitcoin.de CSV and API data are not compatible. Therefore, please delete all data previously imported via Bitcoin.de CSV before starting the API importer.