(a) In most cases, we pay customs duties and VAT fees for buyers through the EU's IOSS system, buyers needn't pay customs duties and VAT fees.
(b) In rare cases, customs will randomly check some packages. If the items in the package are of high value, such as smartphones, customs will not accept the value of the price we declare, but will charge the buyer duties according to the value they assess.

Remélhetőleg nem esek bele a rare case-be