收入归因

Shows which channels bring paying customers, not just visits. A first-party cookie records the first and last touch (UTM tags, referral code, referrer host, landing path; no personal data), the checkout route copies it into the Creem checkout metadata, and the webhook writes every payment, renewal, refund and dispute once into a small SQLite ledger with its channel. A report prints checkouts, orders, conversion and net-of-tax revenue per channel, source or campaign, per currency, first or last touch; a reconcile script compares the ledger with Creem's transaction list and finds missed webhooks and refunds. Ships a zero-dependency core, Next.js App Router files, 14 offline tests, a template check and privacy-policy text in English and Chinese. Use when the user asks where buyers come from, which channel or campaign pays, wants UTM tracking tied to revenue, revenue by source, or to check webhook revenue against Creem.