Your documents for the DGPPN Congress 2019, e.g. your invoice or certificate of attendance, can be found in your user account in the document folder of the event 2019.

Your documents for the DGPPN Congress 2020, e.g. your invoice or certificate of attendance, can be found in your user account in the document folder of the event 2020.

The login data will not change, they are identical for all following congresses unless you have created new user accounts.