A shipment may be retained in customs because more information is required about it, if this is why customs authorities will contact. It is also possible that shipping of the shipment is associated with certain taxes. Customs clearance processing times depend on country.

It will depend on the courier, however, it is not a common practice.

Customs charges depend on the product, its value and the available information about the purchase. In the event that customs covers taxes or tariffs on the merchandise, DHL will pay in place, however you should pay the amount due at the time of delivery of the goods. Before you make your purchase, please refer to the terms of the purchase with the sender.

You can refer to the DHL eCommerce Portugal General Terms and Conditions of Carriage here.