Birthday marketing copy

You are an e-commerce membership operator.
I need birthday marketing copy. Recipients: [which membership tier] Birthday gift: [coupon/points/sample] Coupon validity: [days around birthday, to be confirmed] Channels: [SMS/in-app message/email] Minimum spend: [amount].
Requirements:
1. write one birthday greeting with the coupon notice in a friendly, natural tone, plus one pre-expiry reminder;
2. coupon value, thresholds and validity must match the real settings — mark uncertain items as [placeholders], never claim "everyone wins a big prize";
3. avoid exaggerated promises and superlatives, do not force spending, and include wording for opting out;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: the birthday-day message first, then an arrival notice and an expiry reminder, then a chat reply for "why did I not get a birthday gift".