How to reconcile Amazon Ads against your point-of-sale system
This is the check we run first on every account, written out so you can run it without us. It takes about thirty minutes and needs two numbers: what Amazon Ads says it produced, and what your point-of-sale system actually shows. The gap between them is the only honest measure of whether your tracking works — and if it comes back small, you do not need us.
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Specific to Amazon Ads × POS System
Amazon Ads vs in-store sales: two separate storefronts
There is no join between Amazon Ads and your POS. On-Amazon conversions carry no click identifier you can see, and Amazon reports purchases on its own marketplace, not in your shop. Compare nothing per record. If you sell the same products in-store, treat Amazon and POS as separate channels and test any halo with a regional holdout.
Amazon Ads measures sales that happen on Amazon, attributed inside Amazon's own reporting, so no shared key with a card terminal exists. The conversion API covers off-Amazon destinations such as your website, not a physical till. If you are a brand that also sells through your own stores, the only bridge is aggregate: compare regional in-store sales against regions where Amazon spend changed, and treat the result as directional.
Amazon's attribution windows differ by ad product, and sponsored ads count purchases of related products in your brand, not just the one advertised. That definition has no equivalent in a POS export. Use the advertised-product and brand-halo columns in Amazon's campaign reports to see what is being counted, and never set them against till revenue as if both described the same customers.
A total mismatch here is the expected state, not a fault. The thing to watch for is double counting in your own reporting: Amazon-attributed sales and in-store sales added together while a shared product feed or marketplace integration also writes Amazon orders into the POS. Check whether your POS imports Amazon orders, because that is the usual reason the two appear to overlap.
Amazon Ads × POS System · what breaks
Why Amazon Ads and your point-of-sale system disagree
- 01
Counter sales flowing into online conversions
Where the POS and the online store share an order table, the default integration sends everything. Reported return then climbs with footfall.
- 02
Store visits treated as attributable
Platform-reported store visits are modelled estimates, not counted events. Read them as directional and never sum them with online conversions.
- 03
Tips and taxes inside the conversion value
On food and service businesses tips are substantial and are not your revenue.
- 04
Offer codes never used
Without a code or a distinct landing path, there is no mechanism at all to connect in-store revenue to advertising.
Amazon Ads × POS System · the fix
What you get from this — Amazon Ads × POS System
A number instead of a suspicion
The likely cause, narrowed
A basis for deciding
Amazon Ads × POS System · architecture
What each side is actually counting — Amazon Ads × POS System
- 1
What Amazon Ads counts
For off-Amazon conversions: an event, a timestamp, a value and the click identifier. For on-Amazon conversions: nothing, because the measurement is not yours to do.
- 2
How Amazon Ads attributes it
This is the important thing and most guidance skips it: Amazon Ads spans two very different situations. Sponsored ad formats driving to an Amazon listing produce conversions Amazon measures itself, with no click identifier passed to you and no per-order join available. Amazon DSP driving to your own site is a different case, where a click identifier can reach your landing page and be captured like any other network's.
- 3
The window it uses
Amazon's attribution windows differ by ad product and by whether the conversion happens on Amazon or on your site. Establish which product and which destination you are reporting on before comparing any figure.
- 4
What your point-of-sale system counts
Transactions taken in person, which advertising cannot attribute to a click, found in Square, Lightspeed, Toast, Clover or whatever runs the till.
- 5
The filter that makes them comparable
In-person channel only, separated from any online orders in the same system.
Amazon Ads × POS System · events
Reading the gap — Amazon Ads × POS System
| What you see | What it usually means |
|---|---|
| 15%+ platform higher | Usually the wrong event entirely — the channel filter is missing, so counter sales are being counted as advertising conversions. |
| 20%+ platform lower | Usually structural — almost always correct rather than a fault. in-store revenue mostly cannot be attributed, and a small reported figure is the honest one. |
Amazon Ads × POS System · diagnose
Diagnostic order — Amazon Ads × POS System
- 01
Confirm both numbers cover the same period and channel
- 02
Counter sales flowing into online conversions
Where the POS and the online store share an order table, the default integration sends everything. Reported return then climbs with footfall.
- 03
Store visits treated as attributable
Platform-reported store visits are modelled estimates, not counted events. Read them as directional and never sum them with online conversions.
- 04
Tips and taxes inside the conversion value
On food and service businesses tips are substantial and are not your revenue.
- 05
Read Amazon's own attribution reporting for on-Amazon sales, and your normal reconciliation for off-Amazon conversions
The structural limit is worth stating plainly to anyone selling you on this: for sales that complete inside Amazon, per-order click attribution does not exist and cannot be built. Amazon Attribution gives aggregated, delayed reporting. Anyone offering per-order joins on Amazon-completed sales is describing something that is not available.
Amazon Ads × POS System · prove
How to know you did it right — Amazon Ads × POS System
Source of truth
your point-of-sale system — in-store transactions for a fully closed month
Amazon Ads × POS System · free audit
What we check in the free audit
- Confirm both numbers cover the same period and channel
- Counter sales flowing into online conversions
- Store visits treated as attributable
- Tips and taxes inside the conversion value
- Read Amazon's own attribution reporting for on-Amazon sales, and your normal reconciliation for off-Amazon conversions
Checked against
your point-of-sale system — in-store transactions for a fully closed month
Free30 minutesNo obligation
Amazon Ads × POS System · when not to buy
When the answer is that you do not need us — Amazon Ads × POS System
- If almost all of your in-store transactions come from a channel with no click behind it, no tracking work will reach them — and knowing that is worth more than a build.
- If all your Amazon Ads spend drives to Amazon listings, there is no conversion tracking build here — only a reporting exercise inside Amazon's own tools, and it is worth knowing that before commissioning anything.
Amazon Ads × POS System · what we deliver
The method, step by step — Amazon Ads × POS System
Pull what Amazon Ads reports
Amazon's own attribution reporting for on-amazon sales, and your normal reconciliation for off-amazon conversions.
Pull what your point-of-sale system shows
Export transactions by business date for a closed month, split by sales channel, and note the in-person share of total revenue.
Filter both to the same thing
In-person channel only, separated from any online orders in the same system.
Compare per record, not on totals
FAQ
Amazon Ads × POS System questions, answered
It may influence some, but nothing in Amazon's reporting will show it. A regional holdout comparing in-store sales where Amazon spend changed is the only fair test.
Some POS and inventory systems import marketplace orders into the same sales table. Filter them out by channel before comparing anything against in-store sales.
Because you should know the size of the problem before anyone quotes you for it. If the gap is small, you have saved yourself a purchase. If it is large, you now know what you are buying rather than taking our word for it.
No. Both numbers come from systems you already own and neither leaves them. There is no tool to sign up for and nothing to upload.
Then compare totals for a closed period and treat the result as directional rather than exact. Amazon's own attribution reporting for on-amazon sales, and your normal reconciliation for off-amazon conversions is still the right place to read the platform's side.
Under five percent is working. Five to fifteen usually means reversals are missing. Above twenty is normally the wrong event being counted, not a broken tag — which is why debugging tags first wastes so much time.
Then fix the filter before drawing any conclusion. In-person channel only, separated from any online orders in the same system. A mismatch in scope produces a gap that looks like a tracking fault and is not one.
Book the free thirty-minute call and bring both numbers. We will tell you which of the causes above it is, and whether it is something you can fix yourself — which it sometimes is.
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