For some destinations, customs will not release a parcel without an identification number for the person receiving it. If yours is one of them, we will email you and ask.
Where this applies. Taiwan, Brazil, Chile, Turkey, China, Mexico and India require the recipient's tax ID or national identification number. South Korea requires a PCCC (Personal Customs Clearance Code) instead. This is set by the destination country, not by us. There is more detail in "Why do I need to provide a Tax ID (or PCCC) for my delivery?".
The name on the order must match the name on the ID. This is the single most common reason a parcel gets held or sent back. If you ordered in your own name but the ID belongs to a partner, a parent or a company, tell us — we can usually change the recipient name before it ships, and we cannot once it has gone.
How to send it to us. Reply directly to the email we sent you asking for it. Never post an identification number in a public chat, a social media message or a forum. If you are not sure an email is really from us, do not reply to it — start a fresh email to [email protected] quoting your order number instead.
What we cannot do. We cannot under-declare the value of a parcel or mark it as a gift to reduce your duty. That is customs fraud, and it puts your parcel at risk rather than saving you money.
What you might pay in duty is covered in "Do I have to pay import duties for my package?".