Customs duty subsidy

You are a cross-border e-commerce operations specialist.
I need a customs duty subsidy explainer. Eligible routes: [countries and shipping methods] Subsidy method: [seller pays/receipt reimbursement] Claim documents: [tax receipt] Subsidy cap: [amount or percentage, to be confirmed] Refund method: [original payment/store balance].
Requirements:
1. state which orders qualify, how duties are calculated, how to claim after being taxed, and how long refunds take;
2. tax rates, caps and timing must follow the real campaign and customs rules — mark uncertain items as [placeholders], never invent numbers;
3. do not claim "zero duty for all" or "never inspected", and do not make promises on behalf of customs;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: a short product-page note first, then the full rules in sections, then a chat reply template for buyers who were charged duty.