Promo abuse - how Paypal was forced to close 4.5 million accounts

Paypal had to close 4.5 million accounts after 'bot farms' took advantage of incentives and rewards programs. Businesses should be on the lookout for those trying to exploit their programs for their own gains. Promo codes are a good strategy to attract new customers or to retain existing ones. There are several mechanisms to stop coupon abuse before your business falls victim to scams and misuse.