05/25/2026
If your Shopify or Adobe Commerce store is connected to an ERP, there's one scenario most integrations aren't built to handle.
A customer edits their order after checkout to change a quantity or update an address.
The storefront recalculates using checkout logic. The ERP recalculates using its own pricing rules. Both produce a different total. Neither system is wrong.
The original order has now become two different orders. And nothing in the integration decides which one is correct.
Your support team finds out three days later from a customer ticket - after the inventory reservation has already drifted, and a promotion that was valid at placement has been silently stripped out.
Most integrations are tested for order creation. Not for what happens after.
Full breakdown in the comments 👇