Handling Eventual Consistency in Shopify Integrations

Short summary

Shopify integrations battle eventual consistency: warehouse shows 50 units, Shopify shows 45, causing duplicate orders and oversells. Solutions include idempotent webhook processing with deduplication keys, queue-based async handlers, exponential backoff with jitter, explicit data-ownership matrices, and polling fallbacks. Implement lag alerting, dead-letter queue monitoring, and periodic reconciliation jobs from day one.

• •Idempotent webhook handlers prevent duplicate processing by deduplicating on resource ID + topic
• •Queue-based async processing decouples webhooks from downstream failures, with exponential backoff on retries
• •Explicit data ownership (Shopify owns orders, warehouse owns inventory) eliminates write conflicts
• •Polling fallbacks catch webhook misses; optimistic concurrency control detects stale overwrites
• •Monitor lag metrics, dead-letter queue depth, and reconciliation discrepancies for early failure detection

Generated with AI, which can make mistakes.