A yard that sells on eBay Motors and on its own Shopify store has the same alternator in two places. Each place has its own stock count, and each will happily sell the part without asking the other. "Sync" is the name for whatever keeps those two counts in agreement.
This is how YardTerminal does it, and what it does not do.
What sync usually means
Usually it means two counts and a job that copies one to the other. When that job runs every few minutes, there are a few minutes in which both channels believe they have the part. For a seller with fifty of something that rarely matters. For a used part the count is one, so the gap is the whole risk. We covered the mechanism in why the same part gets sold twice.
One record, two listings
YardTerminal does not keep a count on eBay and another on Shopify and reconcile them. There is one record for the part. The eBay Motors listing and the Shopify product are both published from that record, and neither owns the number.
- The part is catalogued once, from the donor vehicle it came off.
- The agent drafts the listing and a person approves it. Nothing goes to either channel unread.
- The approved listing goes to eBay Motors and to your Shopify storefront.
- When the part sells on one, the listing on the other is ended because of that sale, not at the next scheduled run.
- Each ended listing is then checked against the channel, so a failure shows up instead of sitting quietly.
The counter counts too
A walk-in sale is the one most sync setups never see. In YardTerminal the counter is a channel like the other two. Ring the part up there and its eBay and Shopify listings end the same way.
Why a general sync app is a different thing
There are good apps in the Shopify App Store that connect a store to eBay, and they cost less than we do. They are built for sellers of any product, so they start from a Shopify product, not from a car. We compared them in Shopify to eBay sync apps for used auto parts.
What it does not do
- It covers eBay Motors, a Shopify storefront and your counter. Not Facebook Marketplace, not Car-Part.com.
- It does not see a sale rung up in your yard system. Sell a listed part there and nothing ends.
- It does not publish on its own. Every listing waits for a person.
- It opens in October 2026 and has no customers yet, so none of this has a track record.
The rest is on the limits page.