Usage → D1 ledger → Stripe Billing Meter / invoice items · v1.0.0
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POST /api/usage — idempotent usage + Stripe reportGET /api/usage?email= — period usage + entitlementPOST /api/checkout — Checkout Session for base pricePOST /api/webhook — Stripe webhooks (SubtleCrypto)GET /api/health — JSON health (secret flags only)GET /api/admin/usage — recent rows (X-Admin-Secret)Add-on to the Billflare billing spine ($99). Core spine and Webhooks Pack exclude metered — this pack fills that gap.