When shipping internationally with DHL, you will be asked if you or your customer should pay the duty tax.
DAP – Delivered At Place
This essentially means that the customer pays the duty tax, from DHL's website:
"The seller bears the responsibility and risks to deliver the goods to a named place. The goods are deemed to be delivered when they are placed at the disposal of the buyer on the arriving means of transport ready for unloading at the named place of destination. Parties are advised to specify as clearly as possible the point within the agreed place of destination, because risks transfer at this point from seller to buyer. The seller is required to clear the goods for export and the importer is responsible for effecting customs clearance, and paying any customs duties."
DDP – Delivered Duty Paid
This essentially means that the shipper pays the duty tax, from DHL's website:
"The seller is responsible for delivering the goods to the named place in the country of importation, including all costs and risks in bringing the goods to import destination. This includes duties, taxes and customs formalities."