Your stock numbers do not match between systems
Shopify says an item is available. The warehouse says it is gone. Xero or QuickBooks shows another figure, and a manual correction only holds until the next order, return, receipt or app update.
When several systems can change stock, increasing sync frequency alone rarely fixes the cause. APIwise maps the inventory flow and scopes the simplest reliable route through the systems you already use.
Start here
Choose one stock authority, trace every event and writer for a real SKU, then fix the ownership, mapping or delivery rule that first causes the figures to diverge.
- Customers can order items that are not available.
- Reordering is based on a stale or duplicated count.
- Returns, bundles and multi-location movements are applied differently.
- Finance has to explain quantity or valuation differences at month-end.
- Safety stock and manual adjustments hide the cause without removing it.
- 01More than one system is treated as the source of truth.
- 02Marketplace, point-of-sale and warehouse updates run on different schedules.
- 03SKUs, variants, bundles or units do not map one-to-one.
- 04Returns, cancellations, damage or back orders are handled in only one system.
- 05One sync writes absolute quantities while another expects adjustments.
- 06Updates arrive out of order or a manual edit overwrites a correct value.
- 07An accounts system is being used beyond its useful operational stock role.
Start with one real example.
Preserve the current data before bulk replay, overwrite or clean-up. One traceable example is more useful than a broad description.
- Choose one wrong SKU and record the physical count and every system's count at the same time.
- Identify which system owns on-hand, available and committed stock.
- Check SKU and variant identifiers in every system.
- Trace the last order, return, receipt, adjustment and fulfilment update.
- List every app or person allowed to write a quantity.
- Separate a quantity mismatch from valuation or cost-of-goods differences.
The Integration Health Check maps the systems, inventory events and ownership rules, including where data is created, transformed or overwritten. The output is a prioritised fix with a written scope.
The answer may be connector configuration, a dedicated inventory platform, middleware or custom logic. The diagnosis comes first, and any build is tested against real events and failure cases.
Define
Agree what on-hand, available, committed and expected mean.
Choose authority
Assign one owner for each stock fact and action.
Map events
Cover orders, returns, receipts, transfers and adjustments.
Reconcile
Trace real SKUs and find where divergence starts.
Design
Set identifiers, direction, timing, validation and retries.
Monitor
Alert on failures and reconcile systems on a useful cadence.
Mechanism-only copy. APIwise offers ecommerce and accounting integration plus data-flow mapping, but no approved stock-sync case study is currently available. An integration cannot correct an unknown physical stock position by itself.
A fit when
Retailers and operators whose stock crosses several live systems and repeatedly drifts after ordinary orders, returns or corrections.
Try the smaller route first when
A platform setting, vendor support ticket, accountant or warehouse process specialist may be the right first route when the fault sits in one tool or in unrecorded physical movements.
Why does Shopify stock keep going out of sync?
Common causes are competing writers, mismatched SKUs, late events, manual edits and unclear ownership. Trace one SKU across every writer and timestamp first.
Should Xero be the source of truth for stock?
Not by default. A dedicated inventory or fulfilment platform may be a better operational owner when there are several channels, locations or bundles.
Will a faster sync fix inventory discrepancies?
It may reduce delay, but it will not fix bad mapping, missing events or competing writers. Faster wrong updates remain wrong.
Can you connect Shopify, Xero and our 3PL?
Potentially, subject to their APIs and the required rules. The Health Check confirms feasibility and the source of truth before a build is quoted.