Promo abuse involves exploiting business promotions for unauthorized discounts, resulting in financial losses and inventory depletion, which negatively affects genuine customers and marketing analytics. To combat this, companies can use tools like Fingerprint for browser identification, which provides a unique visitor ID that remains stable despite measures like clearing cookies or using VPNs. This allows businesses to monitor and control the use of promotional codes, ensuring that they are not reused or exploited by multiple accounts or bots. By integrating Fingerprint's identification services, companies can protect their sales campaigns and customer experience while improving the accuracy of marketing data. The use of server-side validation and various SDKs further enhances the reliability of promo abuse prevention strategies, as demonstrated by a leading food manufacturer that successfully implemented these measures to safeguard revenue and customer trust.