If you're shipping to South Korea, then you must add the customer's Personal Customs Clearance Code (PCCC) to the shipping label. Packages shipped without a PCCC printed on the shipping label may be destroyed or returned.
The Personal Customs Clearance Code (PCCC) is 13 digits (e.g. XXXXXX-XXXXXXX)
When preparing your order to print a label, enter the PCCC provided by the customer in the Order Options section, under Importer Reference Number.
Failure to provide this information may result in customs destroying or rejecting your parcel.