With DPD you have the option of either DAP or DT1.
DAP: The receiver is responsible for the customs charges and pays this on delivery.
DT1: The sender of the order is responsible for customs charges and pays it on their end.
You add one of these codes to Extra Code 3 of the required service(s):
Go to Shipping Management then Extras.
Then Courier Service Codes.
Search for one of the affected DPD services.
Click Edit.
Ensure Extra Code 3 is populated with one of the above values.
Click Update.
Note: Only one tracking number is provided by DPD for multi-parcel orders.