02Our Integration Process
From Listing Mapping to Live Sync in Five Steps
You see exactly how your listings, variants, and accounts will be mapped before development starts, not just a finished sync at the end.
05Projects We've Built
Ecommerce Projects We Have Built
A selection of Shopify and ecommerce builds shipped for clients, several involving backend inventory and channel integrations like this one.
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06What Our Clients Say
What Clients Say After Launch
Feedback from ecommerce teams we have built inventory and channel integrations for.
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We had a different kind of problem. People were visiting the store, adding products to their carts, and then disappearing before they finished the order. We had tried a few apps and made changes here and there, but nothing really seemed to solve the bigger issue. The team went through the shopping experience with us and pointed out things we hadn't really noticed ourselves. They cleaned up the cart and checkout flow, made the mobile experience much smoother, and helped us make the store feel easier to shop. I’m not going to pretend we fixed everything overnight, but it finally feels like the store is helping the sale instead of getting in the way of it.
Ethan Parker
Founder of Elite Academy
The mobile experience is probably my favourite part of the new site. We had spent a lot of time making sure the desktop version looked right, and the team kept pushing us to think about how everything would actually feel on a phone too. They were right. The navigation is clean, the interactions feel natural, and everything we’ve tested so far works exactly as it should. They also went through the links, forms, integrations, and other details more than once before launch, which I really appreciated. And even after going live, we could still reach out when something came up. The whole process felt friendly, organised, and surprisingly straightforward.
James Whitmore
Head of Marketing of Lumen Outdoor
We had a pretty specific idea of what we wanted our website to become, but I wasn’t sure how easily we could explain all of it to a development team. There were quite a few moving parts, and we were working toward a deadline, so I expected a few things to get lost along the way. That never really happened. They understood what we were trying to achieve, kept us updated throughout the process, and got everything ready within the agreed timeline. The final site feels much easier to navigate, works beautifully on mobile, and is noticeably smoother for our customers. It was a huge relief seeing the original idea actually turn into the website we had in mind.
Michael Bennett
Founder & CEO of Northbridge Consulting
150+
Projects shipped
10+
Years in development
Top 3%
Upwork Top Rated Plus
5★
Average review score
07Work Culture
Why Businesses Trust Us With eBay Integrations
An eBay integration touches live inventory across every connected account, so accuracy is not optional. These are the habits we bring to every project.
Multi-account handled natively
The sync is built to track inventory across every eBay account you run, not just one.
Buffer stock built in
Safety stock per SKU covers the sync delay between platforms, so a fast-moving item doesn't oversell.
Listing templates mapped correctly
eBay item groups and variations map to your Shopify variants instead of creating duplicate or mismatched listings.
Tested before it's live
Sandbox testing with real order and inventory data before your live store and eBay accounts are connected.
Clear on what's included
You know exactly which listings, SKUs, and accounts sync before development starts.
Built to be maintained
Documentation and an optional retainer so the sync keeps working as eBay's and Shopify's APIs change.
08Overview
Who builds custom Shopify eBay integrations that prevent overselling across multiple accounts?
DeveloperLook builds custom Shopify eBay integrations that sync inventory, orders, and listing templates through eBay's Inventory and Fulfillment APIs, with safety buffer stock and centralized SKU tracking to stop overselling, including across multiple eBay accounts. Projects start from $1,499, most complete in 2 to 5 weeks, and we recommend a connector app first if a single account and simple catalog is all you need.
- Service
- Custom Shopify eBay integration
- Starting price
- From $1,499 USD, fixed scope after a project brief
- Typical timeline
- 2 to 5 weeks
- Platform
- Shopify, Shopify Plus, eBay (single or multiple accounts)
- Built with
- eBay Inventory API, eBay Fulfillment API, Shopify Admin API
- Experience
- 10+ years and 150+ shipped projects
- Post-launch support
- 30 days included, then optional retainer
- Communication
- Calls in US, UK, and AU business hours
Who it's for
Shopify stores expanding onto eBay
You're listing products on eBay alongside Shopify and need inventory and orders to stay in sync automatically instead of updating both by hand.
Sellers running multiple eBay accounts
You operate more than one eBay account against the same inventory pool, and connector apps built for a single account don't cover your setup.
Stores with variant-heavy listings
Your products have color, size, or style variations, and eBay's listing templates and item groups need to map cleanly to Shopify's variants.
Businesses chasing overselling incidents
You've sold the same last unit on both Shopify and eBay before the sync caught up, and need buffer stock and faster sync to stop it.
Sellers evaluating custom build vs off-the-shelf
You're not sure whether a standard eBay connector app covers your catalog and account setup or whether you need something custom.
Not a fit for
You need Amazon or Etsy synced rather than eBay. We build dedicated integrations for those marketplaces too, each around that platform's own API.
You're running a single eBay account with a small, stable catalog. A standard eBay connector app will likely cover that without custom development.
You need your outsourced 3PL warehouse synced rather than a marketplace channel. Our Shopify 3PL Integration service covers that.
You're not on Shopify. This integration is Shopify-specific, and other platforms would need to be scoped separately.
11The Right Technology for Your Project
Technology Stack
We integrate through eBay's Inventory and Fulfillment APIs and Shopify's own APIs, matched to your account and catalog setup.
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12FAQ
Frequently Asked Questions
Straight answers on Shopify eBay integration, multi-account sync, and overselling prevention.
What are the benefits of a Shopify eBay integration?
Inventory, orders, and listings stay in sync automatically instead of being updated by hand on each platform, which cuts overselling risk, saves the time spent double-entering orders, and lets you manage both channels from Shopify.
How does inventory sync between eBay and Shopify work?
The integration uses eBay's Inventory API to update stock levels on inventory items and offers as Shopify sales come in, with a safety buffer per SKU to cover the sync delay between platforms.
Can eBay orders flow into Shopify automatically?
Yes. Orders pulled through eBay's Fulfillment API create a matching order in Shopify with the customer, line items, and shipping details, so your team manages eBay and Shopify orders from one place.
How much does a custom eBay integration cost?
Projects typically start from $1,499 for a single-account, standard catalog integration, and scale up with multiple eBay accounts, high SKU counts, or complex variant structures. You get a fixed quote after reviewing your catalog and account setup.
How do you handle variants and listing templates?
We map eBay's inventory item groups, its structure for listings with variations like color or size, to your Shopify product variants, so a single Shopify product publishes as one correctly structured eBay listing rather than several duplicates.
How are cancellations and returns synced?
Cancellation and return events from eBay's Fulfillment API trigger an update to the matching Shopify order and restock the inventory, so a returned item doesn't sit as sold on your Shopify count.
Can you run multiple eBay accounts with one store?
Yes. We build the sync to track inventory across every eBay account against a single centralized SKU source, which is the setup most connector apps built for a single account don't support.
How do you prevent overselling on eBay?
We set buffer stock per SKU that accounts for sync delay, and centralize SKU tracking across every connected account, so the available count eBay and Shopify show stays conservative enough to avoid a sale you can't fulfill.