I am selling digital items using Opencart and like the title says i want to fight against scammers who just using Paypal's Unauthorized Payment Claim to get their money back after the item has been delivered.
I thought of customer verification by SMS but i dont know if it would be enough to prove the authentication to Paypal.
Also would be fine to find out if someone is using a VPN while making the order.
I am open to any idea.
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