"Letters" is a no-code application designed to seamlessly integrate a brand ambassador program into your e-commerce platform. It empowers existing customers to become brand advocates, effortlessly recommending your brand to their friends and acquaintances. With zero initial costs and significant improvements in ROI, "Letters" provides an efficient marketing strategy by enhancing CPA metrics. The app facilitates new customer acquisition as word-of-mouth spreads through personal networks, reaching audiences previously unaware of your brand and boosting conversion rates. By leveraging trusted connections like family and friends, the app enhances customer loyalty and increases lifetime value (LTV). Additionally, the app supports CSR and PR activities, allowing customizable referral incentives such as charity donations or campaigns. "Letters" also extends its utility to offline stores through QR panel displays, fostering brand promotion beyond individual customer referrals.