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What does "Singleton" or "Singlet" mean in the Signals list?

Whenever you see a fraudulent signal indicating a "Singleton" or a "Singlet", it means that the combination of items, payment information, etc. is likely to be fraudulent.  

Examples:

payment_method singleton:

Rather than saying that only the credit card number is likely fraudulent, we're saying that the number, gateway, and type is likely to be fraudulent as a group.

 

items singleton:

It means that this item or combination of items is likely targeted by fraudsters.

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