Meaning
Customs duties are destination-based charges or processes that may apply to international shipments.
Where it fits
Use this term on a returns page when the term affects eligibility, returns, refunds, or exchanges. Keep the wording short, then link to the full policy or support path when the answer has exceptions.
This is educational copy guidance, not legal advice. Match the final wording to the store's actual policy, support capacity, and fulfillment process.