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Development of Scalable eWallet Backend API for Multi-Region QSR Chain Integration

railwaymen.org

Food & Beverage

Retail

Technology

Challenges in Integrating Unified Payment System Across Multi-Region QSR Operations

Existing fragmented client-side tools lacked seamless integration with a centralized eWallet system, hindering convenience for users across 100s of restaurant points. Regional operational differences (e.g., phone-number-based user identification in Saudi Arabia) and multi-currency requirements complicated unified system implementation.

About the Client

Saudi Arabia-based Quick Service Restaurant (QSR) operator managing franchises like Domino’s Pizza and Dunkin’ Donuts across Arab countries, focusing on technological innovation and customer experience enhancement.

Key Objectives for eWallet System Implementation

Design a flexible backend API to unify eWallet functionality across all customer-facing applications
Enable seamless integration with existing POS systems and mobile/web platforms
Support multi-region operations with currency-agnostic transaction handling
Enhance user experience through cashback, promotional coupons, and streamlined customer service workflows

Core System Functionalities and Key Features

Phone-number-based user account management
Multi-currency transaction processing
Promotional coupon generation and redemption system
Customer service ticketing and compensation management
Unified reporting dashboard for transaction analytics

Technology Stack Requirements

Ruby on Rails (RoR) backend framework

RESTful API architecture

PostgreSQL database

Payment gateway integrations (local Saudi solutions)

Critical System Integrations

Existing POS systems across restaurant locations
Mobile/web applications (iOS, Android, Web)
Third-party payment processors
Multi-currency exchange rate APIs

Non-Functional Requirements

High scalability for thousands of concurrent transactions
99.9% system availability SLA
PCI-DSS compliance for payment security
Low-latency response times (<500ms) for critical operations

Expected Business Impact of eWallet Integration

Enables unified customer experience across all restaurant chains, reduces payment processing complexity by 40%, increases customer retention through loyalty programs, and streamlines international financial operations through centralized multi-currency management.