Connect OnBuy to Shopify for automatic product, order, and inventory sync across both platforms.
The OnBuy Shopify integration connects your store to the OnBuy marketplace so products, orders, and stock levels stay synchronized automatically. No duplicate data entry. No switching between platforms. Just one dashboard managing both channels. Here’s exactly how it works and what you get.
TL;DR: An OnBuy Shopify integration connects your Shopify store to the OnBuy marketplace so products, orders, and inventory stay in sync automatically. No manual data entry, no spreadsheet exports, no logging into two platforms to keep things straight.
OnBuy processed over 150 million pounds in sales in 2024. The marketplace lists more than 36 million products, attracts 3.5 million monthly visits, and grew revenue by 224% year-over-year. For UK-based Shopify sellers looking to expand beyond their own store, OnBuy is the marketplace that keeps coming up.
The appeal is simple: lower fees than Amazon (commissions range from 5-15% with no listing fees), no competition from the platform’s own brands, and organic product rankings that don’t require advertising spend. We break down the full comparison in our OnBuy vs Amazon UK article.
But adding a marketplace means adding complexity. You now have two places where products need accurate data, two places where orders come in, and two inventory counts that need to agree with each other. That’s the problem an integration solves.
Your Shopify product catalog is your source of truth. Titles, descriptions, images, prices, variants, barcodes: you’ve already got all of this in Shopify. An integration pushes that data to OnBuy and creates marketplace listings from it.
When you update a product in Shopify (new price, updated description, different image), the change syncs to OnBuy. When you add a new product, it shows up on OnBuy. No duplicate data entry. No forgetting to update one platform when you change the other.
OnBuy requires GTINs (barcodes) for every listing. If your Shopify products have barcodes assigned, they map directly. If they don’t, you’ll need to add them before OnBuy listings can go live.
A customer buys your product on OnBuy. Within minutes, that order appears in your Shopify admin. Same format, same workflow. You fulfill it like any other Shopify order: pick, pack, ship, add tracking.
The tracking number and fulfillment status sync back to OnBuy automatically. The customer sees their delivery tracking on OnBuy’s platform. You see a completed order in Shopify. Everyone’s happy.
This matters because your fulfillment team (whether that’s you or a 3PL) works from one system. No switching between OnBuy’s seller panel and Shopify admin. No orders falling through the cracks because someone forgot to check the other platform. We cover the details in our OnBuy order sync guide.
This is the one that prevents disasters. Every sale on any channel decreases your available stock. Every restock increases it. The integration keeps these numbers synchronized between Shopify and OnBuy in real time.
Sell 3 units on Shopify? OnBuy immediately reflects the lower stock count. Sell 1 on OnBuy? Shopify’s inventory drops by 1. Receive a shipment from your supplier and add 50 units in Shopify? OnBuy shows the new quantity.
Without this, you’re playing a dangerous game. Overselling on OnBuy leads to forced cancellations, refunds, and damaged seller ratings. We explain the full mechanics in our stock sync guide.
Once connected, your daily workflow barely changes. You manage products in Shopify. You fulfill orders in Shopify. You track inventory in Shopify. The integration handles everything between Shopify and OnBuy in the background.
What changes is your revenue. You now have customers finding your products through OnBuy’s marketplace search. Orders come in that wouldn’t have existed without the second channel. And the operational overhead is close to zero because you’re not managing two separate platforms.
The setup involves connecting your Shopify store to your OnBuy seller account through the integration. You’ll need an active OnBuy seller account (Standard plan starts at 25 pounds/month plus VAT) and API access, which OnBuy provides through their seller control panel.
If you don’t have an OnBuy seller account yet, you’ll need to apply. OnBuy requires a registered business, at least 50 positive buyer reviews on an existing selling platform, and valid GTINs for your products. Our complete guide to selling on OnBuy from Shopify walks through the full requirements and setup process.
OnBuy isn’t just a UK marketplace anymore. They’ve expanded into 12 European countries including Germany, France, Spain, Italy, and the Netherlands. One seller account covers all markets. If you’re already set up for UK sales, expanding to OnBuy Europe is an incremental step, not a separate project.
The integration handles EU orders the same way it handles UK orders. They all flow into your Shopify admin. Your stock stays synchronized across every market.
If you sell physical products with barcodes, ship your own orders, and want more customers without more complexity, an OnBuy integration is a low-risk way to test a growing marketplace. The fees are transparent, the marketplace is expanding, and the integration means you’re not doubling your workload.
Ready to connect? Head to the Shopify OnBuy integration page to get started.