Inventory synchronization for online retailers and brands that sell through multiple channels. Selling through your own web shop, Amazon, Bol.com and perhaps a physical store? We make sure every channel shows the same, correct stock within seconds, so you never sell what you don't have.
- Real-time: every sale, return and receipt is pushed to every channel immediately, not every five minutes.
- No overselling: even when two customers buy the last unit at the same time on different channels.
- One source of truth: a central inventory ledger recording every stock movement, with an audit trail.
- Integrated: Shopify, WooCommerce, Magento, Amazon, Bol.com, Exact Online, AFAS and your warehouse.
Why Inventory Sync Goes Wrong
As long as you sell through one channel, inventory is simple. From the second channel onwards, problems appear:
- Latency. A connector that syncs every five minutes leaves the last unit for sale on every channel for five minutes.
- Concurrent sales. Two orders on two channels for the same last unit are both confirmed. One customer gets a cancellation, and on Amazon and Bol.com that also hurts your seller metrics.
- Multiple locations. Stock sits in your own warehouse, at a fulfilment partner or in a store. The question is not just how much you have, but how much is available to each channel.
- Bundles and kits. When you sell a bundle, every component's stock must go down, and available bundles follow from whichever component runs out first.
- Manual corrections. Fixing differences by hand in each system creates new errors.
Running your own warehouse? See warehouse management software (WMS) for receiving, picking, shipping and managing multiple warehouses.
How We Synchronize Inventory
Central inventory ledger. Instead of making every channel talk directly to every other channel, we keep one central ledger. Every movement (sale, return, receipt, adjustment) is recorded there, and the new level goes to every channel immediately.
Event-driven. Where platforms offer webhooks, such as Shopify and WooCommerce, we process orders the moment they arrive. Where a platform only supports polling, we fetch as often as its API allows. Duplicate and late notifications are handled correctly.
Reservations and buffers. Stock is reserved atomically when an order comes in, so two channels can't sell the same unit. Per channel you can set a buffer or allocate stock, for example holding part back for B2B customers.
Monitoring and alerts. The system continuously compares the level on every channel with the ledger and reports differences immediately. Connector failures show up straight away too, not at the next stock count.
Sales Channel and System Integrations
- Shopify: stock per location via the Inventory API.
- WooCommerce: including variable products and per-variation stock.
- Magento: stock and orders via the Magento API.
- Amazon: via the Selling Partner API, including FBA combined with self-fulfilment.
- Bol.com: offer stock and order processing via the Retailer API.
- Exact Online and AFAS: receipts, adjustments and write-offs from your accounting or ERP.
- Warehouse and fulfilment: see warehouse integration.
Need full inventory management as well, with barcode scanning, reorder suggestions and multiple warehouses? See our inventory software. Selling on many channels at once? Then a multi-channel selling platform may fit too.
How We Build Your Inventory Sync
- Map the landscape. Every channel you sell on, every location where stock is held and every system that changes stock.
- Design. Which system leads, how buffers and allocations work and how often each platform is updated.
- Build and test. We test real scenarios, such as concurrent sales, returns and outages, before anything goes live.
- Go live channel by channel. So there is always a fallback.
- Operations. Monitoring every connector and adapting when platforms change their APIs.
Frequently Asked Questions about Inventory Synchronization
Why not just use a standard connector or plugin?
For one web shop and one marketplace, a standard connector often works fine. Custom sync pays off with multiple channels and locations, bundles, per-channel buffers, an ERP as the source, or when you regularly face overselling or manual corrections today.
How fast is stock updated?
Within seconds for channels with webhooks. For channels that only support polling, as often as that platform's API allows. The central ledger and reservations prevent the last unit from being sold twice in the meantime.
Does this work with Amazon or Bol.com and my own web shop?
Yes, that is one of the most common setups. We connect the marketplaces through their APIs and your web shop (Shopify, WooCommerce, Magento or a custom platform) through its API, with one ledger in between.
What if a connector is temporarily down?
Stock movements are queued and processed as soon as the connection is back. You are alerted immediately, and after recovery the system verifies that every channel is correct again.
Do we own the source code?
You can. Ownership of the source code is set out in the contract, and the code can be fully yours, including documentation and tests.
Never Sell What You Don't Have
Sync failures are invisible until they surface as cancellations, complaints and hours of manual work. We map your channels and stock, and build a sync that stays correct.