DDP vs DDU shipping for cross border ecommerce orders

DDP and DDU look like shipping terms, but they change the customer experience more than people expect. I have seen stores save a little on the front end by shipping DDU, then spend the next week answering angry messages from buyers who did not know taxes were due at delivery. The package may be moving fine, but the customer feels surprised, and that surprise turns into refusal, chargeback risk, o…