When you book an international delivery, you are only paying for the cost to ship the items.
It is the customer's responsibility to ensure they check whether there may be any extra taxes, duties or customs however for the vast majority of shipments of used personal effects with low value, often there are no charges.
Any charges are decided upon on a case by case basis by customs in the country you are sending to. This does not apply if shipping within the EU.
If your items have an extremely high declared value or are being exported for the purposes of a sale, this may lead to customs charges for your shipment. All customs charges are payable to the local customs authority however our courier partner may contact you on their behalf to receive the charges.