Dux Loyalty: An Integrated Loyalty Management System with Web Admin Portal and POS-Based Flutter SDK Integration

The increasing convergence of retail and banking ecosystems demands seamless and intelligent customer engagement solutions. This research proposes a Real-Time POS– Loyalty Integration Framework that establishes a standardized API-based orchestration layer to integrate Android Point-of-Sale (POS) systems with centralized loyalty engines. The objective is to enable instant reward accrual and redemption during live transactions, ensuring a frictionless checkout experience. The proposed framework introduces a secure middleware layer that facilitates real-time communication between POS terminals, banking networks, and loyalty management platforms. Built on RESTful APIs and event-driven architecture, the system supports dynamic rule evaluation for reward calculation, including tier-based incentives and promotional campaigns. The framework exposes 56 REST API endpoints across Customer Management, Campaign Management, Tier Configuration, Analytics, and Transaction modules — all secured through JWT-based token authentication with refresh token rotation. Security is maintained through token-based authentication, encrypted data exchange, and role-based access control, ensuring compliance with financial-grade standards. The framework supports interoperability with payment gateways and core banking systems, enabling unified ecosystem participation. By enabling real-time reward visibility and redemption at checkout, the system enhances customer satisfaction and retention while providing retailers and banks with actionable transaction analytics across five dimensions: Member Health, Points Economy, Customer Engagement, Financial Impact, and Tier Dynamics.