Development of a Multi-Cart E-Commerce Mobile Marketplace with Secure Payment Integration

The client operates an online beverage delivery marketplace that offers a broad product catalog and various purchasing options. Existing web platform solutions lack mobile app counterparts with key features such as multi-cart management and seamless payment retries, limiting customer convenience and sales opportunities. The client requires a robust mobile application that supports multiple shopping carts, accurate discount and tax calculations, fraud-proof payment processing, and improved user experience on iOS and Android devices.

A mid-sized online marketplace specializing in diverse beverage products, aiming to enhance user shopping experience and sales through advanced mobile platform capabilities.

• Develop iOS and Android applications that provide users with intuitive multi-cart management capabilities, enabling creation, naming, and management of multiple shopping carts from a single account.
• Implement a direct navigation flow that takes users from cart management to checkout seamlessly.
• Integrate a reliable payment gateway that ensures safe online transactions, with payment retry logic that preserves data integrity and prevents fraud.
• Enable accurate calculation of discounts, taxes, and subtotals using custom algorithms.
• Support features such as product favorites or wishlists, delivery time slot editing, and order history downloads in PDF format.
• Ensure secure user authentication with automatic logouts after inactivity to enhance user safety.
• Optimize the system with scalable architecture to support high user volumes and concurrent transactions.
• Allow vendors to create and manage promotional offers and display product catalogs in visually appealing formats.

• Multiple Shopping Carts: Enable users to create, name, and manage multiple carts for different delivery options (e.g., home delivery, pick-up).
• Unified Cart Navigation: Support straightforward transition from cart management to immediate checkout.
• Product Details & Favorites: Allow users to view product details with expandable information and mark items as favorites for future shopping.
• Quantity Adjustment & Add to Cart: Facilitate easy selection of product quantities with intuitive '+'/-' controls.
• Delivery Time Slot Management: Allow customers to select and edit preferred delivery or pickup time slots.
• Pricing Calculator: Accurately compute total prices deriving from subtotal, discounts, and taxes via custom algorithms.
• Secure Payment Gateway: Integrate a fault-tolerant, fraud-proof payment system capable of handling retries without data corruption.
• Order History & PDF Export: Enable users to download order summaries and history in PDF format for records.
• Promotional Management: Support vendor-driven promotional offers targeted at specific customer segments.
• Automatic User Logout: Log out inactive users automatically to protect account security.

• Payment gateway API for secure transactions including retry logic
• Promotional content management system for customized vendor offers
• PDF generation tools for order summaries and reports

• Scalability to support increasing user load and concurrent transactions
• High data security standards, especially for payment data and user information
• Reliable payment retry mechanisms to ensure transaction integrity
• Fast response times for search, filter, and checkout processes
• Robust error handling and logging to facilitate troubleshooting

The development of a multi-cart, secure, and user-friendly mobile marketplace is expected to significantly improve customer engagement and satisfaction. It will enable the client to increase sales opportunities by allowing customers to manage multiple product lists simultaneously, execute faster checkouts, and benefit from targeted promotions. Anticipated outcomes include a higher conversion rate, more efficient order management, and enhanced overall user experience leading to increased revenue and customer loyalty.