1. App Price / 应用价格
Paid download via Google Play: USD $5（以商店标价为准）。
2. Included Credits / 赠送额度
55
Free credits after purchase & activation
购买并激活账号后一次性赠送 55 封发送额度（每账号仅一次）
3. Consumption / 扣费
- Greeting email + reminder email share one credit pool.
- Each successful send costs 1 credit.
- Cancel pending task before send: 0 credit.
- Final hard send failure: refund 1 credit.
4. Optional Top-Up / 可选充值
Voluntary only. Google Play Billing only. No subscription. No out-of-app channels.
金额为整数 $1–$50；到账额度 = 金额 × 11。
$1
11
credits
quota_usd_1
$5
55
credits
quota_usd_5
$10
110
credits
quota_usd_10
$20
220
credits
quota_usd_20
$50
550
credits
quota_usd_50
UI allows entering any integer 1–50; each maps to quota_usd_N.
| USD | Credits | product_id |
|---|---|---|
| $1 | 11 | quota_usd_1 |
| $5 | 55 | quota_usd_5 |
| $10 | 110 | quota_usd_10 |
| $20 | 220 | quota_usd_20 |
| $50 | 550 | quota_usd_50 |
5. Validity / 有效期
Credits do not expire and can stack.
额度永不过期，可累计使用。
6. Refunds / 退款
Handled under Google Play policies.
按 Google Play 政策处理。