How automatic OnBuy order sync imports marketplace orders into Shopify for centralized fulfillment.
OnBuy order sync pulls your OnBuy orders directly into Shopify so you manage everything from one admin. No logging into two platforms. No orders slipping through the cracks. Your team fulfills OnBuy orders exactly like Shopify orders, and tracking syncs back automatically.
TL;DR: Selling on OnBuy alongside your Shopify store means orders come in from two places. Without automation, you’re copying order details by hand, risking mistakes, and slowing down fulfillment. An OnBuy Shopify integration pulls OnBuy orders straight into your Shopify admin so you can manage everything from one place.
You sell a product on OnBuy at 2pm. A customer buys the same product on Shopify at 2:05pm. You check OnBuy’s seller panel, see the order, then manually create it in Shopify so your inventory updates. Except you were shipping another order and didn’t check OnBuy until 4pm. By then, you’ve already sold the last unit on Shopify.
This is what happens without order sync. It’s not a theoretical risk. It’s the Tuesday afternoon reality of any seller running multiple channels manually.
With an integration between OnBuy and Shopify, the flow looks like this:
The whole point is that your Shopify admin becomes the single place where you manage all orders, regardless of which channel they came from.
A properly synced OnBuy order in Shopify includes:
The OnBuy order reference stays attached so you can always trace which channel the sale came from. This matters for reporting, customer service, and reconciling payments.
OnBuy doesn’t have a fulfillment service like Amazon’s FBA. Sellers handle shipping themselves. For Shopify sellers, this is business as usual. You’re already fulfilling orders from your own warehouse or through a third-party logistics provider.
The integration’s job is to keep both platforms in sync. When you mark an order as shipped in Shopify and enter a tracking number, that data pushes to OnBuy. The customer sees their tracking information on OnBuy’s platform. OnBuy marks the order as dispatched.
Timing matters here. OnBuy expects sellers to dispatch within their stated handling time. Late dispatches hurt your seller rating. Since OnBuy orders appear in your Shopify admin alongside all your other orders, they get the same fulfillment priority and workflow. No separate queue to check.
OnBuy requires sellers to have a returns solution for every country they sell in. That can be a local return address or a prepaid return label arrangement. Returns initiated through OnBuy follow OnBuy’s returns policy, which you agree to when setting up your seller account.
When a return happens, you’ll handle the refund or replacement through OnBuy’s seller panel. The integration keeps the order history intact in Shopify so you have a complete record of the transaction, including any returns.
Order sync and inventory sync are two sides of the same coin. Every order that imports into Shopify adjusts your stock levels. That stock change then pushes back to OnBuy, preventing overselling.
Without order sync, inventory sync can’t work properly. If OnBuy orders don’t reduce your Shopify stock, you’ll show available units on Shopify that don’t actually exist. The chain breaks at the first link.
Most Shopify sellers who add OnBuy are already thinking about additional channels. The operational pattern stays the same: Shopify as the hub, with marketplace orders flowing in and fulfillment data flowing out.
Getting OnBuy order sync right is the foundation. Once you’ve proven the workflow handles a second channel, adding a third or fourth follows the same logic. Our complete guide to selling on OnBuy covers the full setup process, including how to connect your product catalog.
Ready to centralize your orders? Check out the Shopify OnBuy integration to get started.