Three places to change one price
A supplier puts a price up. Someone changes it in Shopify, then logs into Seller Central and changes it there, then eBay. The eBay listing has a slightly different title because it was written by someone who has since left. The Amazon listing has an old photo. Stock is updated on Shopify by the sync, on eBay by a separate app, and on Amazon when somebody remembers.
Then an item sells on eBay and on Shopify within the same hour, and there was only one.
Why the channels drift apart
Most sellers add marketplaces one at a time. Each is set up in a hurry, with the product data copied across and adjusted to pass that marketplace's rules. From that point there are several copies of every product, each edited independently.
Marketplaces also want different things. Amazon has its own product types and required attributes, and some products must be matched to an existing catalogue entry rather than listed fresh. eBay has its own categories and item specifics. So even a good sync tool needs extra data that your Shopify products do not hold, and that gap is usually filled by hand, per listing.
What running them separately costs
| Problem | Result |
|---|---|
| Stock updated at different times | Oversells, cancellations and marketplace penalties |
| Prices changed in one place only | Selling below cost on one channel |
| Different titles and images | Inconsistent brand, more customer questions |
| Orders in three dashboards | Slower dispatch and missed orders |
| Listings created by hand | New products reach marketplaces late or never |
Marketplace cancellations are more serious than store ones. They count against your seller metrics, and poor metrics can limit what you are allowed to sell.
Then there is the time. Someone spends a slice of every day logged into three dashboards, checking for new orders, answering marketplace messages and fixing listings that were suppressed for a missing attribute. That work grows with every product you add, which is why many sellers quietly stop adding new lines to marketplaces at all.
How we bring the channels together
- Choose the master. For most sellers Shopify is the product and stock master. If you have an ERP or warehouse system, stock may come from there instead.
- Extend product data. We add the attributes each marketplace needs as metafields on the Shopify product, so marketplace data lives with the product rather than in each listing.
- Pick the connection. Sometimes a well-configured connector app is enough. Where it is not, we connect directly to the Amazon Selling Partner API and eBay's APIs.
- Publish with rules. Which products go to which channel, price adjustments per channel to cover fees, and title formats per marketplace, all set as rules rather than per listing.
- One stock pool. Every channel reads from the same available figure, with buffers on fast sellers.
- Orders into one flow. Marketplace orders are pulled into your fulfilment process alongside Shopify orders, and tracking is sent back to the marketplace it came from.
- Error reporting. Rejected listings and failed updates appear in one list with the marketplace's reason, instead of being discovered weeks later.
Running several channels from one place
Prices and product details are changed once. Stock is shared. Orders from every channel arrive in the same queue and go out the same way. Adding a new product to Amazon becomes a matter of filling in its marketplace attributes and switching it on, not writing a new listing from scratch.
It also becomes realistic to try another marketplace later, because most of the work is already done.
Reporting improves as a side effect. With every order in one flow, you can compare margin by channel after fees, and see which products earn their place on a marketplace and which only add work.
Sound familiar?
- You log into Seller Central, eBay and Shopify separately every day.
- Prices or titles differ between channels without anyone deciding they should.
- Stock on at least one marketplace is updated by hand.
- You have had marketplace cancellations because of oversells.
- New products take a long time to appear on marketplaces, if they do at all.