Digital Marketplace (In App Purchases)

A fully integrated digital marketplace embedded inside an existing mobile app — enabling users to discover, purchase, and instantly receive virtual goods through a seamless, secure, and engaging in-app shopping experience.

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Overview

The client had an existing mobile app with an engaged user base but no monetisation layer. The goal was to build a digital storefront directly inside the app — selling high-demand virtual goods such as Free Fire Diamonds, PUBG UC, and premium software licenses — without disrupting the existing user experience. The solution integrates Stripe for secure payment processing, Firebase for real-time inventory and user data, and includes a live admin chat feature for support and order queries. The result was a 5x increase in in-app purchase revenue within the first quarter of launch.

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Core Features

• Virtual goods storefront — A clean, browsable catalogue of digital products including gaming top-ups (Free Fire Diamonds, PUBG UC) and software licenses, with category filters and search.

• Secure in-app payments via Stripe — Full Stripe API integration handles card payments, payment intent confirmation, and webhook-based order fulfilment — all within the app with no redirects.

• Real-time inventory management — Firebase keeps product availability, pricing, and stock counts in sync across all sessions — ensuring users never purchase out-of-stock items.

• Personalised recommendations — Purchase history and browsing behaviour are used to surface relevant products, increasing average order value and repeat purchases.

• Promotional offers & discounts — Admins can create time-limited deals, bundle offers, and promo codes directly from the backend — driving urgency and boosting conversion rates.

• Live admin chat — Users can open a direct chat thread with the admin for order support, delivery queries, or product questions — reducing friction and building trust at the point of purchase.

• Order history & receipts — Every purchase is logged under the user's account with full transaction details, making it easy to track past orders and reorder frequently used items.

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Technical Architecture

• Flutter powers the entire client-side experience — rendering the marketplace, checkout flow, and chat interface natively on both iOS and Android from a single codebase.

• Stripe API manages the full payment lifecycle — from payment intent creation and 3D Secure authentication to webhook-triggered delivery confirmation — with PCI-compliant card handling throughout.

• Firebase Firestore stores product catalogues, user profiles, order records, and chat messages — with real-time listeners ensuring the UI reflects the latest state instantly without manual refresh.

• Firebase Authentication handles user identity — supporting email/password and social login flows, with purchase records and chat history tied securely to each authenticated account.

• Firebase Cloud Functions run server-side logic for payment verification, inventory decrement on purchase, and automated delivery triggers — keeping sensitive operations off the client entirely.

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Delivery Phases