Rocky
50 lines
2.4 KiB
Markdown
50 lines
2.4 KiB
Markdown
# StoreKit credit product
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The voluntary `ByRockyACoffee` tip remains independent and never grants credits.
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Credit products are separate consumables:
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- Product ID `500tks`: 500 integer credits at USD 0.99
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- Product ID `1500tks`: 1,500 integer credits at USD 1.99 / CNY 18
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- Product ID `3000tks`: 3,000 integer credits at USD 2.99 / CNY 28
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- Territory prices remain controlled by App Store Connect.
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- Restore Purchases: not offered for this consumable
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## Cost basis
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Reviewed on 2026-08-18 against the provider pricing pages:
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- DeepSeek V4 Flash peak pricing is CNY 3 per million cache-miss input tokens
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and CNY 9 per million output tokens. Off-peak pricing is half.
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<https://api-docs.deepseek.com/zh-cn/quick_start/pricing>
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- Doubao SeedASR 2.0 streaming recognition is CNY 4.5 per hour.
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<https://ai.volcengine.com/model>
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The V10 immutable rate card charges:
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- ASR: one credit per started three-second interval. The 3,000-credit pack
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provides up to 150 minutes and has a worst-case provider cost of CNY 11.25.
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- DeepSeek: one credit per 1,000 input tokens plus one credit per 400 output
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tokens, with each dimension rounded upward. At peak pricing, using all 3,000
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credits exclusively on input or output costs at most about CNY 9.00 or
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CNY 10.80 respectively.
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- New signup, inviter and invitee grants are 1,000 credits each. Existing
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immutable balances are adjusted only through explicit admin grants.
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- Existing immutable ledger balances are grandfathered and are not rewritten
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during the denomination change.
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At a CNY 28 sale price, the ASR-heavy worst case leaves CNY 12.55 after a 15%
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App Store commission, or CNY 8.35 after a 30% commission, before tax and
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infrastructure costs. USD 2.99 territories are tighter at the worst-case ASR
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mix and require ongoing margin monitoring.
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## Transaction rules
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- The app supplies the authenticated account UUID as StoreKit `appAccountToken`.
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- The server verifies Apple's JWS signature, certificate chain, bundle ID,
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App Apple ID, environment, consumable type, account token, and product ID.
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- The App Store transaction ID is globally unique and idempotent.
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- Credit balance and append-only purchase/ledger records commit in one database
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transaction. A client retry returns the original grant.
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- The app finishes the StoreKit transaction only after server acknowledgement.
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- Signed transaction bodies and Apple certificate contents are never logged.
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