https://payment-services.ingenico.co..._en.ashx?la=en
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The situation in the U.S. is particularly dire. The U.S. alone accounts for almost 50 percent of global fraud but only about 21 percent of global payments transactions. Issuers in the U.S. lost nearly $4 billion last year to counterfeit transactions, according to The Nilson Report.
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CardNotPresent.com - Articles
Which countries have high e-commerce fraud rates? | eCommerceMILO
Why is the USA so high on the fraud lists?
More VPNs and Proxies are in the USA -- the fraudsters are not really US persons.
Grey list the VPN IPs then SMS or 3ds all the related transactions -- that is the starting source of most 'serial' chargebacks -- what I call the unchecked transaction syndrome. New customers are also the biggest source of chargebacks I see and that is an easy atavistic for you to see
Blocking countries only loses you sales today. Hardening verification routines on questionable transactions is the way to go.