Square Amazon integration that keeps the register and the marketplace in step
For shops that ring sales on a Square register and also sell on Amazon. Neither side accepts a tracking number from us, so shipping detail for both lives in QuickSync, and Amazon keeps its own count for anything it stores and ships. Both sides tell us the moment something sells, so the other is corrected in a second or two.
No credit card · connected in about ten minutes · nothing changes until you say so · Updated 14 August 2026
Square
AmazonWhat a Square Amazon integration actually moves
One row per job, based on how QuickSync connects to Square and Amazon today. Where a side does not allow something, the cell says so.
| What | Square | Amazon |
|---|---|---|
| Stock count | Both ways | We always send, and hear back for items you ship |
| 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 | Amazon does not accept one from us |
| 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 | The moment it happens |
Running the register and the other channel by hand
The register and the Amazon 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 Amazon 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 either shop reaches the other in a second or two |
One Amazon order, start to finish
Real timings, second by second.
Amazon · order #447114:02:11Amazon41sourceSquare41+0.3sCorrecting Square takes under a second once we have the sale. The order is in your packing list with the Amazon order number on it.
The other direction is the same: a sale on Square reaches Amazon just as quickly, because Square pushes it to us the moment it happens too.
Connecting Square and Amazon 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 Amazon
You authorise QuickSync in Seller Central for the marketplaces you sell in.
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 Amazon integration has constraints. These are the ones that apply here.
Quick between Square and Amazon
Both Square and Amazon tell us the moment something sells, so a sale in one is reflected in the other in a second or two. There is no polling gap on this pair.
Stock Amazon holds is left alone
We always send your count to Amazon, but we only take changes back for items you ship yourself. Anything Amazon stores and ships keeps its own count, which is Amazon’s to own.
Nothing publishes itself to Square or Amazon
Copying a listing from Square to Amazon (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.
Neither side will hold a tracking number
Both platforms lack the field, so the workflow has to account for it from day one.
Square has no field for a tracking number, and neither does Amazon. So when you post an order from this stock, the number lives in QuickSync and there is no second place to read it from. Nothing is lost. But if your process is for someone to open Amazon or the Square dashboard and read tracking off the record, that process is the thing to change before you connect rather than after.
The upside on this pair is speed. Both Square and Amazon push their changes to us as they happen, so neither is sitting behind a scheduled check. A sale at the till and a sale on Amazon each reach the other side without waiting to be noticed, which is the situation that otherwise produces an oversell on a busy Saturday with a queue at the counter.
Twenty characters is the whole budget
Amazon has the tightest SKU limit we deal with anywhere; Square is four times as generous.
Square will hold 80 characters of SKU. Amazon takes 20. Since the SKU is what identifies the item on both sides, the shorter limit governs everything, and 20 characters goes fast in any naming scheme built out of words. We truncate at the channel’s limit rather than refusing to send, so nothing errors: the item simply stops pairing with itself, and you find out when a count drifts weeks later.
Which way stock moves depends on who ships it. We always send your count out to Amazon, so a till sale lowers what Amazon shows. Changes coming back are the part that differs. For items you pick and post yourself, Amazon-side changes reach us and carry through to Square. For anything Amazon holds and ships, we deliberately leave the count alone.
That last part is a design decision rather than an unfinished feature. Amazon knows what is on its own shelves; we would be guessing at receipts, damages and returns that never pass through us. So those items keep Amazon’s figure, and your Square count is not expected to match them. Worth saying out loud, because a book number that quietly disagrees with a warehouse is worse than no number at all.
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 Amazon 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 Amazon update after something sells on Square?
A second or two in normal conditions. Square tells us the moment the sale happens and we write the new count to Amazon straight away. The reverse is the same when Amazon sells. If either side is briefly unreachable we hold the update and keep trying rather than dropping it.
Can I sync Square POS inventory with Amazon?
Yes, matched by SKU, and both platforms report changes as they happen rather than on a timer. Two things to plan for: Amazon truncates any SKU longer than 20 characters, and stock that Amazon holds and ships keeps its own count. Items you pick and post yourself sync in both directions.
Where does tracking go for Square and Amazon orders?
Into QuickSync, and only there. Neither platform has a field for a tracking number, which makes this the one gap on the pair worth designing around, because there is no second place to read it from. If your team works out of the Square dashboard or Amazon, they will need to look in QuickSync instead.
Do I have to re-list my Square products on Amazon?
No. We match your existing Square and Amazon 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 Amazon?
Yes. Set a rule once for Amazon: a percentage, a fixed uplift, or a price you type yourself. We apply it whenever the price changes, and nothing forces Square and Amazon to the same number.
Does the tracking number go back to both shops?
Not to Square and Amazon. 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. Amazon has no way for us to send a tracking number back.
Does an Amazon order get recreated on Square?
No. The order stays on Amazon. 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 Amazon?
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 Amazon.
Which plan do I need for Square and Amazon?
Lite covers Square and Amazon. 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 Amazon 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 Amazon stay in step.