Make it mandatory for all contributors to install google java format in their IDEs to format code.

I can see hardcoded api messages in controller, use a enum to define all messages to manage easily.

Is your feature request related to a problem? Please describe.
If a user forgets PIN or Password there are no ways to recover.

Describe the solution you'd like
Implement methods to reset PIN or password, e.g., via email.

I can see a lot setter and getter methods and autowired annotations on service layer. To look more clear and readable we can add lombok support in backend system.

Is your feature request related to a problem? Please describe.
For developers and non developers that might take interest in this project might need swagger UI for easy documentation and comprehension

Describe the solution you'd like
Implement swagger UI. I mean the Open API version

Describe alternatives you've considered
Postman is an alternative sure. But it does not make documentation as easy and comprehensible as swagger UI

Additional context
I want to ask if I can go ahead with implementing swagger with the app

Use controller for request and response.

I can see in controller there is if else being used, please move all logic to service layer instead controller e-g: controller used for user authentication.

To ensure the robustness and reliability of our application, I propose enhancing the test coverage in our test suite. This will help us identify potential issues early and maintain high code quality. Specifically, we should:

1. Identify Critical Areas: Focus on areas with the highest impact on functionality.
2. Increase Unit Tests: Add more unit tests to cover edge cases and different scenarios.
3. Follow TDD: Implement tests before adding any feature.

Please add support for messages resource bundles.

Is your feature request related to a problem? Please describe.
The Angular HttpClient currently fails to parse the OTP response correctly when it is returned as plain text. This leads to parsing errors and affects the functionality of handling OTP responses in our application.

Describe the solution you'd like
I would like to modify the OTP response to be returned as JSON format instead of plain text.

Describe alternatives you've considered
One alternative considered was to continue using plain text but with additional parsing logic on the client-side. However, this approach adds complexity and potential maintenance issues compared to directly returning JSON.

Additional context
This issue impacts the user experience by hindering the accurate processing of OTP responses in our Angular application. By implementing this change, we aim to improve the reliability and efficiency of OTP handling.

Is your feature request related to a problem? Please describe.
Currently, the codebase lacks comprehensive docstrings, making it difficult for developers to understand the purpose and functionality of various methods and classes. This can lead to confusion and increased time spent on code review and debugging.

Describe the solution you'd like
I propose adding detailed docstrings to all methods and classes in the codebase. These docstrings should follow a consistent format and provide clear explanations of the parameters, return values, and any exceptions raised.

Describe alternatives you've considered
Creating a separate documentation file is an alternative solution, but it might not be as effective as embedding docstrings directly within the code. Docstrings are more accessible to developers, making it easier for them to understand and maintain the code.

Additional context
Adding comprehensive docstrings will improve code readability and maintainability, making it easier for both current and future developers to work with the codebase.