Introduction
We implemented a promotional mechanic for a payment system based on receipt uploads. Users made purchases, scanned their receipts, and received chances to win prizes, driving higher engagement and transaction volume. As part of the project, we developed a user-friendly web interface, an automated receipt validation system, and fraud prevention algorithms, ensuring high processing speed and seamless platform performance. Additionally, we incorporated a transparent consent mechanism to comply with data protection standards, ensuring a secure and trustworthy user experience.