Inventory sync: keep stock levels accurate across every channel

If you sell in more than one place, your stock figure is only as good as the last time someone updated it. A sale on Amazon, a return in your Shopify store and a delivery booked into the warehouse all change what you actually have on the shelf. When those systems don't talk to each other, the numbers drift apart, and you find out when a customer orders something you no longer have.

Inventory sync fixes that by keeping a single, accurate stock figure flowing between every system that needs it.

What is inventory sync?

Inventory sync is the automatic exchange of stock data between the systems you use to sell, store and account for products. Typically that means:

• Sales channels such as Shopify, WooCommerce, Magento, Amazon and eBay
• Warehouse and order management such as Linnworks, Mintsoft or ShipStation
• Accounting and ERP such as Sage 50, Sage 200, Xero, QuickBooks or NetSuite

One system is treated as the source of truth for stock, usually your ERP, accounting package or warehouse system. Changes there are pushed out to every channel, and orders coming in from each channel are pulled back so stock is reduced in one place.

Why manual stock updates break down

Spreadsheets and end-of-day uploads work when order volumes are low. As you add channels and SKUs, the gaps start to cost money:

• Overselling. A product sells out on one channel but still shows as available on another, leading to cancellations, refunds and marketplace penalties.
• Underselling. Stock sits in the warehouse while a channel shows it as out of stock, so you lose sales you could have made.
• Wasted time. Staff re-key quantities between systems instead of serving customers or managing suppliers.
• Unreliable numbers. Finance can't trust stock valuations, and purchasing decisions are made on out-of-date data.

How inventory sync works with Zynk

Zynk connects your systems without custom code. A typical setup looks like this:

1. Choose your source of truth. Decide which system owns the stock figure, for example Sage 200 or Linnworks.
2. Map your products. Match SKUs across systems, including variants, bundles and multiple warehouse locations.
3. Set the schedule. Sync stock as often as you need, from every few minutes to a set time each day.
4. Let it run. Orders flow in, stock levels flow out, and any errors are flagged so nothing fails silently.

Because the same platform also handles orders, customers, despatches and payments, inventory sync usually sits alongside full order-to-accounts automation rather than being a separate tool.

What to look for in inventory sync software

When comparing options, check that the software can:

• Connect to every channel and back-office system you use today, and the ones you plan to add
• Handle multiple warehouses or locations, not just a single stock figure
• Support bundles, kits and variants without manual workarounds
• Let you control sync frequency to suit your order volumes
• Alert you to errors with clear logs, so problems are fixed before customers notice
• Scale with you, without per-channel rebuilds as you grow

Get started faster with a template

If your systems are already on our list, a ready-made template can get you running quickly. Popular inventory and order sync templates include Shopify to Sage 200, Shopify to Sage 50, Linnworks to Sage 200 and WooCommerce to Sage 50.

See all integrations to check the systems you use, or browse templates for a pre-built starting point.