| Orders reach the warehouse | CSV exported and imported daily | Posted within minutes | Makes same day dispatch cut offs realistic rather than aspirational. |
| Stock shown on the product page | One number, updated overnight | Per location, near real time | The precondition for pickup, ship from store and honest delivery estimates. |
| A trade customer checks out | Retail price, credited later | Contract price at checkout | Mapped to B2B catalogues on Shopify Plus, or customer tags on standard Shopify. |
| Order edited after purchase | ERP keeps the original version | Edits and cancellations flow through | Line level changes, not just a whole of order status update. |
| Shipped from two locations | Customer told nothing | Part fulfilments with tracking | Two accurate notifications instead of one silence and a phone call. |
| Monthly payout reconciliation | Two days matching fees and orders | Orders, fees and payouts mapped | Shopify Payments settles net of fees on its own schedule, so it needs deliberate mapping. |
| A refund is processed | Credit note raised separately | Credit and stock flow together | Returned stock re-enters availability rather than waiting for someone to remember. |
| A sale triples order volume | Imports back up, staff work late | Queued, paced and retried safely | Shopify and ERP rate limits are modelled and tested ahead of peak trading. |