> For the complete documentation index, see [llms.txt](https://seree.gitbook.io/seree-litepaper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://seree.gitbook.io/seree-litepaper/technical-details.md).

# Technical Details

A high-level overview of the entire architecture, encompassing the server, mobile, and web applications. Together, these components form an integrated system designed to facilitate secure and efficient payment processing on the Ethereum blockchain. The architecture is built to be scalable, secure, and user-friendly, catering to both mobile and web users while ensuring seamless interaction with backend services and the Ethereum network.

<figure><img src="/files/0n2mHnKnqv300cw5dTx2" alt=""><figcaption><p>This flow chart represents the logical flow of the payment process, from user input to final transaction result display.</p></figcaption></figure>

#### Flow Chart Explanation

1. **User Inputs Payment Details:**
   * User enters the payment amount and account number.
   * The form validates the input data.
2. **Fetch Exchange Rate:**
   * The system fetches the latest exchange rate from EverAPI / CoinMarketCap.
   * The rate is displayed to the user for confirmation.
3. **User Confirms Payment:**
   * The user clicks the "Pay" button, triggering the payment process.
   * A UUID is generated for the transaction.
4. **Simulate Smart Contract Transaction:**
   * The frontend simulates the smart contract transaction using the provided UUID and payment details.
   * The transaction is validated before being executed.
5. **Execute Payment:**
   * The smart contract transaction is executed on the Ethereum blockchain.
   * The transaction details are recorded.
6. **Fetch Payout Data:**
   * The system sends a request to the backend API to process the payout based on the UUID.
   * The backend API responds with the payout details.
7. **Display Transaction Result:**
   * The system displays the result of the transaction, including the payout ID and amount.
   * The user is informed of the transaction's success or failure.

#### **1.  MPC Server (Backend) Overview**

The server acts as the central hub for both mobile and web applications, managing critical operations such as payment processing and interaction with the Ethereum blockchain. Implemented using Rust, the server is designed for scalability and high performance.

* **API Endpoints:**
  * Handles requests from mobile and web apps for payment processing, currency conversion, and Ethereum transactions.
  * Manages user authentication with token-based (JWT) mechanisms, ensuring secure access to services.
* **Middleware and Security:**
  * Includes error handling, request validation, data encryption, and rate limiting to protect against vulnerabilities and ensure robust operations.
* **Database Management:**
  * Manages user profiles, transaction logs, and other essential data securely.
* **Scalability and Performance:**
  * Implements load balancing, caching, and horizontal scaling to handle increased traffic and maintain high availability.

#### **2. Mobile Application Overview**

The mobile application is designed to provide a seamless and intuitive user experience for interacting with the Ethereum blockchain and managing payments. It is developed using Flutter, ensuring cross-platform compatibility for both iOS and Android devices.

* **User Interface:**
  * Offers a user-friendly and responsive interface with features like MoMo payment integration, Ethereum wallet management, and real-time transaction tracking.
  * Includes robust validation and feedback mechanisms to guide users through payment processes securely.
* **Blockchain Integration:**
  * Facilitates Ethereum transactions directly from the app, allowing users to manage wallets, send/receive payments, and track transaction history.
  * Integrates with the backend server for secure and efficient processing of payments and interaction with smart contracts.
* **Security:**
  * Utilizes secure storage mechanisms for sensitive data, such as wallet credentials and transaction details.

#### **3. Web Application Overview**

The web application, built using React.js and TypeScript, provides a full-featured platform for users to manage payments and interact with the Ethereum blockchain. It is optimized for both desktop and mobile browsers, ensuring a consistent experience across devices.

* **User Interface:**
  * Features a clean and responsive design, offering a smooth user experience with components like the payment form, balance display, and transaction history.
  * Implements form validation and real-time feedback to guide users through the payment process.
* **Ethereum Integration:**
  * Connects to Ethereum wallets using Web3Modal and Wagmi libraries, enabling users to perform blockchain transactions directly from the browser.
  * Interacts with smart contracts and handles cryptocurrency payments securely.
* **Security and Error Handling:**
  * Ensures data security through encryption and secure API interactions with the backend server.
  * Implements comprehensive error handling, providing users with meaningful feedback in case of issues during transactions or API interactions.

#### **4. Integration and Workflow**

The system architecture integrates the server, mobile, and web applications into a cohesive platform that delivers a seamless user experience:

* **User Workflow:**
  1. **Payment Initiation:**
     * Users can initiate a payment through the mobile or web application. The app sends a request to the server to process the payment, including currency conversion if necessary.
  2. **Blockchain Interaction:**
     * The server facilitates the transaction by interacting with the Ethereum blockchain, either sending or receiving payments based on user input.
  3. **Transaction Confirmation:**
     * The server confirms the transaction, updating the user's balance and transaction history, which is then reflected in the mobile or web interface.
  4. **Real-Time Feedback:**
     * Both mobile and web applications provide users with real-time feedback on transaction status, ensuring transparency and trust in the process.

#### **Conclusion**

The combined architecture of the server, mobile, and web applications creates a robust, secure, and scalable ecosystem for managing Ethereum-based payments. By leveraging modern technologies like Flutter, React, and Ethereum libraries, the system provides a seamless user experience across platforms, ensuring accessibility and reliability. This integration of front-end and back-end components allows users to interact with the blockchain effortlessly, whether they are on the go or at their desktop.


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