Key Takeaways B2B eCommerce ERP integration keeps orders, inventory, pricing, customers, and invoices in sync between your store and ERP automatically, instead of manual re-keying. Four integration methods exist — point-to-point, middleware, iPaaS, and native connector — trading off speed to launch against scalability and maintenance burden. A clean architecture uses three layers: the commerce platform, an integration layer for mapping and retries, and the ERP, with event-driven sync beating polling for freshness. Idempotency keys, retries with backoff, and a dead-letter queue are what stop a network blip from becoming a duplicate or lost order. B2B eCommerce ERP integration connects your online store to your ERP so orders, inventory, pricing tiers, customer accounts, and invoices stay in sync automatically.