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Fabrick’s RESTful API

Fabrick’s RESTful API

Arad Faraji / March 23, 2025

Spring Boot REST Controller for Fabrick API Integration

During my work with a fintech company, I developed a RESTful banking service using Spring Boot to integrate with Fabrick’s API. This project aimed to provide secure and efficient access to banking operations such as retrieving account balances, listing transactions, and handling money transfers.

🏗️ Project Overview

The banking service was designed with a layered architecture, ensuring modularity, maintainability, and ease of testing. The integration with Fabrick’s API required handling external API calls efficiently while maintaining local persistence for audit and traceability.

🔑 Key Features

📌 Account Balance Retrieval

  • Developed an API endpoint to fetch account balances via Fabrick’s banking services.
  • Implemented data validation and response parsing for consistent API outputs.

📌 Transaction Listing with Date Filtering

  • Built an endpoint to fetch transactions for a given date range.
  • Ensured input validation (e.g., date formatting and range checks).
  • Optimized API response handling for better performance.

📌 Money Transfer Functionality

  • Implemented secure fund transfers with structured request and response models.
  • Integrated Spring Data JPA for local transaction logging to provide an audit trail.

📌 Secure External API Communication

  • Configured RestTemplate for seamless interaction with Fabrick’s API.
  • Centralized external API configurations for scalability and security.

🛠️ Technologies & Architecture

  • Spring Boot – RESTful API development
  • Spring Data JPA – Persistence layer for transaction records
  • H2 Database – Temporary in-memory storage for auditing
  • RestTemplate – External API communication
  • Swagger/OpenAPI – API documentation for easy client interaction
  • Jakarta Bean Validation – Input validation for requests
  • Global Exception Handling – Standardized error handling across services
  • JUnit & Mockito – Unit and integration testing

🏆 Challenges & Solutions

🔍 API Response Handling

  • Challenge: Handling inconsistent external API responses.
  • Solution: Implemented a custom response parser to standardize data formats.

🔄 Secure Money Transfers

  • Challenge: Ensuring secure transactions and proper logging.
  • Solution: Implemented custom exceptions and centralized transaction logging.

⚡ Performance Optimization

  • Challenge: Efficiently querying and storing large transaction data.
  • Solution: Optimized database indexing and structured queries.

🚀 Conclusion

This project demonstrated my expertise in Spring Boot, API integrations, and secure financial application development. The scalability and maintainability of this REST controller make it a strong foundation for fintech applications handling real-world banking transactions.