docs(webhooks): critical-path callout and Rust signature example#88
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Cali93 wants to merge 1 commit into
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docs(webhooks): critical-path callout and Rust signature example#88Cali93 wants to merge 1 commit into
Cali93 wants to merge 1 commit into
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- Add a top-of-page warning: never gate a payment's outcome on receiving a webhook; webhooks are a notification layer, not the system of record (Riaz's feedback, backed by Stripe/Shopify/ Coinbase precedents) - Restructure webhooks vs. polling into the three-layer pattern: polling as source of truth, webhooks for speed, reconciliation as backstop - Add a Rust signature verification example (hmac/sha2/base64 crates; Rust stdlib has no crypto), validated against the test vector - Note the Rust crate exception in the agent prompt Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Cali93
marked this pull request as ready for review
July 22, 2026 14:15
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Summary
Follow-up to #87 with two changes:
1. Critical-path callout (Riaz's feedback). A
Warningat the top of the page: never gate a payment's outcome on receiving a webhook. Webhooks are a fast notification layer, not the system of record; delivery is best-effort and can be late, duplicated, out of order, or missing entirely. The webhooks vs. polling section is restructured into the three-layer pattern the major providers (Stripe, Shopify, Coinbase Commerce) document: polling as source of truth, webhooks for speed, periodic reconciliation as backstop. Wording keeps the contract facts from #87 review: the event payload is a full versioned snapshot, so no API call is needed inside the handler.2. Rust signature example. Added to the verification code group. Rust's standard library has no crypto, so it uses the
hmac,sha2, andbase64crates (noted in the intro line and the agent prompt). Validated against the Svix test vector: correct signature accepted, altered body rejected, second-of-multiple entries matched; comparison is constant-time viaMac::verify_slice.Linear: WCPM-530
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