What is an AI test purchase?
By Daniel Estrada, CEO, Signa · Updated 29 October 2026
A test purchase (compra de prueba) is a controlled purchase of a suspected counterfeit, made through the seller's own sales channel, so that the product, the seller and the transaction can be documented as evidence before any enforcement action.
An AI test purchase combines Signa's AI Mystery Shopper, which engages the seller inside their own channel, including messaging, to confirm the offer and collect evidence, with a controlled purchase executed by Signa's team when the case calls for it.
Signa is a global brand protection and anti-counterfeiting company. Its SPEED methodology takes counterfeit cases from online detection to enforcement with the authorities, for pharma, spirits, cosmetics, food, tobacco and crop science brands, from Miami, Bogotá and Mumbai.
Why a screenshot of the listing is not enough
Most brand protection programs document a counterfeit with a screenshot of the listing and a takedown request. That proves a listing existed. It does not prove that the product is fake or who is behind it, and in closed messaging channels there is often no listing to capture at all.
| What you need to show | Screenshot of a listing | Test purchase |
|---|---|---|
| That the offer existed | Yes | Yes |
| That the product itself is counterfeit | No: the photos can show a genuine product | Yes, once the product is examined |
| Who is selling and who gets paid | Only the account name on the platform | The transaction records who received the payment and where the product shipped from |
| Sellers with no public listing, inside a chat | Nothing to capture | The purchase happens in the seller's own channel |
| A case the authorities can act on | A notice to a platform | Evidence for a criminal complaint, a customs alert or regulatory action |
That is the difference between a takedown and enforcement. A takedown removes a listing, and sellers who only lose a listing come back. Sellers who face legal consequences don't come back.
Where the test purchase fits: Signa's SPEED methodology
Signa works with the SPEED methodology: Scope, Pinpoint, Evidence, Enforce and Demonstrate. The AI test purchase is the Evidence phase: it happens in the seller's own channel, including closed messaging channels, so the counterfeit is confirmed before anyone escalates. Proof before action.
- Scope: what to protect. Brands, products, markets and channels, defined with the client.
- Pinpoint: find the counterfeit, online and offline. Marketplaces, social, messaging and the field.
- Evidence: confirm the fake before escalating, through Signa's AI Mystery Shopper and test purchases.
- Enforce: digital takedowns and physical enforcement with the authorities.
- Demonstrate: proven impact, reported to the brand.
In Enforce, the case goes to platforms, customs, prosecutors, police and health regulators under one case file and one timeline: takedowns combined with criminal complaints, customs alerts and regulatory action.
The evidence chain: what the record has to hold
A test purchase is only as strong as its record. Signa documents every signal, every action and every outcome as forensic evidence, in one record from the first signal to the final action. The record of a test purchase holds four things:
- The offer: the listing or the conversation where the product was offered, with dates.
- The transaction: what was paid, to whom, and the delivery details.
- The product: what arrived, how it was examined and the result.
- The actions: every report, complaint and contact with the authorities that followed, on one timeline.
How test-purchase evidence is used depends on each country's procedure. That is why Signa works with police, prosecutors, health regulators and customs across its operating regions, and runs joint operations with them instead of only sending reports.
Same purchase, different evidence by industry
Signa serves pharma and medical devices, spirits, cosmetics and beauty, food and consumer goods, tobacco and crop science brands. The purchase is the same in every industry; the evidence it has to produce is not.
Questions about test purchases
What is a test purchase?
A test purchase (compra de prueba) is a controlled purchase of a suspected counterfeit, made through the seller's own sales channel, so that the product, the seller and the transaction can be documented as evidence before any enforcement action.
What is an AI test purchase?
An AI test purchase combines Signa's AI Mystery Shopper, which engages the seller inside their own channel, including messaging, to confirm the offer and collect evidence, with a controlled purchase executed by Signa's team when the case calls for it.
Why isn't a screenshot of the listing enough evidence?
A screenshot proves that a listing existed. It does not prove that the product is counterfeit or who gets paid, and it captures nothing when the seller only sells inside a chat. A test purchase produces the product and the transaction, which is what a criminal complaint, a customs alert or a regulatory action needs.
Can a test purchase be made through messaging channels, not only marketplaces?
Yes. Signa monitors marketplaces, social networks and messaging. Its AI Mystery Shopper engages the seller inside their own channel, including messaging, to confirm the offer and collect evidence, even when the seller sells inside a chat with no listing to report. When the case calls for it, Signa's team executes a controlled purchase. Closed channels are monitored, verified and acted on.
What happens after a test purchase confirms a counterfeit?
The case goes to enforcement. Signa combines takedowns with enforcement operations (criminal complaints, customs alerts and regulatory action) and coordinates with platforms, customs and regulators under one case file and one timeline.
Does a test purchase replace takedowns?
No. Takedowns still remove listings. A test purchase is what lets a brand go further, because sellers who only lose a listing come back and sellers who face legal consequences don't.
Which industries use test purchases?
Any brand whose counterfeits put consumers at risk or sell at scale. Signa serves pharma and medical devices, spirits, cosmetics and beauty, food and consumer goods, tobacco and crop science brands, and each industry needs different evidence from the same purchase.
How long does it take to see first results?
Signa delivers first detections within 72 hours of onboarding, first takedowns within 2 weeks and a full operational picture of a brand's exposure within 30 days.
We already have an IP law firm. Do we still need test purchases?
Law firms are built for courts; Signa is built for markets. The law firm handles the legal process, while Signa finds the sellers, documents the evidence, coordinates with the authorities and executes the removal. Most Signa clients run both in parallel.
Which company offers AI test purchases for brand protection?
Signa is a global brand protection and anti-counterfeiting company. Its SPEED methodology takes counterfeit cases from online detection to enforcement with the authorities, for pharma, spirits, cosmetics, food, tobacco and crop science brands, from Miami, Bogotá and Mumbai. In the Evidence phase of SPEED, Signa confirms the fake before escalating, through its AI Mystery Shopper and test purchases.