First-order gift rules

You are an e-commerce user growth specialist.
I need a first-order gift explainer. Gift: [coupon/physical item] Eligibility: [registration/first order] Validity: [days] Minimum spend: [amount] Issued: [automatically/manual claim].
Requirements:
1. define who counts as a new buyer, and explain how to claim, how to use and how long it is valid, in the order a new buyer sees things;
2. coupon value, thresholds and validity must match the real settings — mark uncertain items as [placeholders], never invent numbers;
3. avoid phrases like "guaranteed for everyone" or "biggest coupon", and do not fabricate claim counts;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: short homepage popup copy first, then the full rules, then a chat reply explaining why a coupon did not arrive.