Square eBay integration that keeps the register and the marketplace in step
For shops that ring sales on a Square register and also list on eBay. Tracking goes one way here: we can write a courier reference onto the eBay order, and Square has no field to put one in, so posted sales are recorded on eBay and in QuickSync. Square tells us the moment something sells, so eBay is corrected in a second or two. eBay does not announce a sale, so we check it every couple of minutes instead.
No credit card · connected in about ten minutes · nothing changes until you say so · Updated 14 August 2026
Square
eBayWhat a Square eBay integration actually moves
One row per job, based on how QuickSync connects to Square and eBay today. Where a side does not allow something, the cell says so.
| What | Square | eBay |
|---|---|---|
| Stock count | Both ways | Both ways |
| New listings | We can create and update | We can create and update |
| Prices | Sent, with your rule applied | Sent, with your rule applied |
| Orders in | Into QuickSync | Into QuickSync |
| Tracking back | Square does not accept one | Sent to the order |
| Photos and options | Photos, sizes and colours | Photos, sizes and colours |
| How fast we update it | Under a second | A second or two |
| How fast it tells us | The moment it happens | We check every two minutes |
Running the register and the other channel by hand
The register and the eBay listing are the same unit of stock. When only one of them knows it sold, the other keeps offering it. That is how you oversell.
| Two shops, run by hand | Two shops, connected |
|---|---|
| The last one sells in both shops within the same hour | Whichever shop sells it, the other one drops to match |
| Typing the same stock numbers into Square and eBay each morning | One count, sent to both, without anyone opening a spreadsheet |
| Changing a price means editing the same product twice | Change it once and each shop gets the price you set for it |
| Orders in two dashboards, matched up by hand at the end of the week | Every order already matched to the right product |
| A refund leaves your numbers wrong until someone notices | A refund puts the stock back and tells both shops |
| Guessing how stale each shop’s number is | A sale on eBay is found within two minutes and Square is corrected straight after |
One eBay order, start to finish
Real timings, including the wait. A sale on Square is the quicker direction, because Square tells us and eBay does not.
eBay · order #447114:02:11eBay41sourceSquare41+0.3sCorrecting Square takes under a second once we have the sale. The order is in your packing list with the eBay order number on it, and a tracking number added later goes back to eBay on its own.
The other direction is faster: a sale on Square reaches eBay in a second or two, because Square pushes it to us the moment it happens.
Connecting Square and eBay takes about ten minutes
Most of that is us matching your catalogues. The two connections themselves are a login each.
Connect Square
You sign in to Square and approve QuickSync. It covers your catalogue, stock and orders across the locations you pick.
Connect eBay
You sign in to eBay and grant QuickSync access to the selling account.
Let it match your products
We line the two catalogues up by SKU, then by title, and hand you a short list of anything we could not match. You decide what happens to those.
Watch, then switch it on
Leave it watching for a few days and check the numbers agree. When you are happy, let it start making changes, one shop at a time.
The limits: know them before you connect
Every Square eBay integration has constraints. These are the ones that apply here.
eBay waits; Square does not
A Square sale reaches eBay in a second or two. An eBay sale reaches Square on our next look, which is within two minutes. Hold back a little safety stock and that window stops mattering.
No tracking number back to Square
Square has no field for us to write a tracking number into, so shipping detail lives in QuickSync and in whichever shop the order came from. Counter sales rarely need it; posted ones are worth knowing about.
Nothing publishes itself to Square or eBay
Copying a listing from Square to eBay (or the other way) always waits for you to look at it. Stock is the only thing that moves on its own, and only once you have turned it on.
The till is instant, eBay is checked
Square tells us the second something scans. eBay has to be asked.
A sale at the Square register reaches us immediately, because Square announces it. eBay works the other way round: it has no means of telling us anything, so we check it every couple of minutes for both stock and orders. That difference is the whole character of this pair. One side is live and the other is on a short timer, and it is the timer you plan around.
The scene worth picturing is a Saturday. Someone is at the counter with the last one in their hand while a buyer on eBay is paying for the same item. The eBay sale is real but we have not looked yet, so for up to a couple of minutes the register still believes there is stock. Safety stock on your fastest sellers is the plain fix and it costs a few units of headroom.
Going the other way is quicker. When something scans at the till, the new count leaves for eBay without waiting for a scheduled check, so your listing drops promptly after a counter sale. That is the direction most shops care about, because an eBay listing showing stock you have already sold is the version of this problem that reaches a stranger rather than you.
Fifty characters of SKU, and no tracking back into Square
Both belong to the platforms rather than to us, and both are easier to handle up front.
Matching runs on the SKU, and eBay is the shorter side: 50 characters where Square will hold 80. A code the till accepts without complaint can still reach eBay clipped, and a clipped code no longer names the item it left. That surfaces later as a count that has drifted rather than as an error you could have acted on, so read through your longest codes now.
The second limit is tracking. Nothing in Square holds a tracking number, so a parcel you send for an eBay order is recorded in QuickSync and nowhere else. Sales that walk out of the shop never need one, which is why this rarely bites anyone. It matters if a colleague works out of Square and expects the shipping detail to be sitting on the sale.
Two shops fits the smallest plan
Your catalogue size picks the plan, and your plan price covers two connected shops with every shop after that adding it again. Three shops on Lite is $38 a month.
Lite
$19/mo for two shops1,000 items and up to eight connected integrations, with stock matched on both sides automatically. Enough for Square and eBay on their own, at $19 a month for the two.
Pro
$29/mo for two shops2,500 items and up to eight connected integrations. Listings and orders sync here as well as stock. Most sellers running two shops properly end up here.
Ultra at $69 and Ultra+ at $99 add larger catalogues, price rules and setup help. Every plan starts with a 14-day free trial and no card.
Questions people ask about this pair
How quickly does Square update after something sells on eBay?
Within two minutes. eBay has no way of telling us the moment a sale happens, so we check it on a short timer instead. Once we have the sale, correcting Square takes under a second. The other direction is much quicker: Square tells us straight away. If either shop has an outage, we hold the update and retry until it goes through.
Can I sync Square inventory with eBay?
Yes. QuickSync sits between them and matches items by SKU, so a counter sale lowers what your eBay listing shows and an eBay sale lowers the register. Square reports changes to us straight away. eBay announces nothing, so we check it every couple of minutes. Keep SKUs within 50 characters for eBay.
Does eBay tracking show up in Square?
No. Square has no field for a tracking number, so we cannot write one into it, and the tracking stays in QuickSync instead. If someone on your team reads shipping detail off the Square sale, that is the habit to change before you start, because the number will not be there.
Do I have to re-list my Square products on eBay?
No. We match your existing Square and eBay listings by SKU first, then by title, and hand you a short list of whatever we could not match. You can also copy a listing from one side to the other if you want it in both places; that step always waits for you.
Can I charge a different price on eBay?
Yes. Set a rule once for eBay: a percentage, a fixed uplift, or a price you type yourself. We apply it whenever the price changes, and nothing forces Square and eBay to the same number.
Does the tracking number go back to both shops?
Not to Square. Square has no way for us to send a tracking number back, so the shipping detail stays in QuickSync and in whichever shop the order came from.
Does an eBay order get recreated on Square?
No. The order stays on eBay. We pull it into your one QuickSync list next to your Square orders so you pack from one place, without creating a duplicate Square order for it.
What happens if a buyer cancels or I refund them on Square or eBay?
The stock goes back. A cancellation or a refund puts the item back into your count and we send the corrected number to both Square and eBay.
Which plan do I need for Square and eBay?
Lite covers Square and eBay. Lite is $19 a month for two shops and holds 1,000 items, with up to eight connected integrations. You would move up a plan for catalogue size, and your bill goes up by another $19 if you connect a third shop.
Selling somewhere else as well?
Each combination has its own page, including the limits that apply to that pair, not a generic Square write-up with the logo swapped.
Or read about one shop on its own
Every channel has a page covering exactly what syncs, what does not, and how fast.
Connect Square and eBay and watch one correct the other
Make one test sale and watch the other shop’s count drop. If it doesn’t work the way this page describes, you’ve spent ten minutes and no money.
No credit card required
Setup guides for this pair
Connect each shop with its own walkthrough, then come back to this page for how Square and eBay stay in step.