The DHL plugin can also be used with a DHL system user. The system user has the advantage that the password only needs to be changed every 365 days.
For system user data, when using the Check credentials button in the plugin's configuration window, the error message appears stating that the credentials are invalid and that you should check them in the business customer portal. This message can be ignored, as you cannot log in to the business customer portal with the system user data.
As soon as the correct login data for the system user, as well as the customer number and participation numbers, are entered in the configuration window, the DHL plugin can be used as usual.