Redis rate limits for multi-platform commerce APIs

Third-party commerce APIs punish noisy neighbors. A naive queue dump against Shopify or BigCommerce will 429 mid-sync and leave catalogs half-updated.

I prefer Redis token buckets per platform + shop: a Lua script that refills tokens and returns either a permit or a retry-after. Workers sleep cooperatively instead of hammering.

Inbound webhooks stay on a separate fast path — verify, persist, enqueue — so rate limits on outbound connectors never stall acknowledgement of the source platform.

Cache read-heavy catalog lookups briefly, but never cache payment or inventory mutations. Measure p95 connector latency before and after; the wins usually show up as fewer retry storms, not raw RPS.