Map products, variants and SKUs
Identity must be consistent before inventory and order synchronization can be trusted.
Choose stock synchronization rules
Define reservations, available-to-sell quantity and multi-location behavior.
Map the order lifecycle
Shopify order/payment state should connect to warehouse, shipment and return stages.
Keep customer identity usable
Decide how repeated customers, addresses and contact changes are managed.
Design retry and exception handling
Temporary API or data errors should not silently create missing orders or stock drift.
Reconcile after go-live
For the first period, compare storefront orders and stock with ERP records until the integration is proven stable.
The operating principle
Every event should remain connected to the product, contact or transaction that created it. That is what lets ERP explain a number instead of only displaying it.