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For the contributors 🫂

Haven't made your first-contribution yet? 😢

Do check our First Contribution repository, where we have provided the guidelines to set up Git and how to make a pull request !

Project setup

Fork and clone the repository

Copy the URL of the forked repository and clone it.

git clone https://github.com/<github_username>/fintech-api

Change the directory

cd fintech-api

Folder Structure

fintect-api
│
└───📂helpers
│   │   { Python functions for different calculations }
│
└───📂tasks
│   │   { Python functions for different tasks }
│
└───📂validators
│   │   { Pydantic Models for different validations }

📄.gitignore
📄CONTRIBUTING.md
📄main.py
📄README.md
📄requirements.txt
📄test_main.py

Create a virtual environment

python -m venv env

Activate the virtual environment

For windows

env\Scripts\Activate.ps1

For Linux

source env/bin/activate

Install the dependencies

pip install -r requirements.txt

Run the FastAPI server

uvicorn main:app --reload

Run pytest

from root directory (FINTECH-API) where test_main.py is located

pip install pytest # install pytest, only need to do once
pip install httpx
pytest #run the test

What to contribute?👀 Check the project workflow section below.

Once you are done with the changes you wanted to add. Follow the steps to make the pull request.

Create and checkout to the new branch.

git checkout -b <branch_name>

Add the changes

git add .

Commit your change with a proper messagge

git commit -m "Enter your message here"

Make the Pull Request

git push origin <branch_name>

Project workflow

Briefly explaining, this project is an API providing endpoints that makes your financial calculation easy. This API can be easily integrated into websites, mobile applications, chrome extensions, etc. So how it works?

  • Once you run the server, and route to a path. For now, be it /simple_interest_rate (mentioned in main.py). You'll need to pass some query parameters.

  • As it is described, this endpoint returns the simple interest based on some input provided by the user.

  • Or you can route to the /docs path, where you can easily access and visualize the endpoints through a dashboard provided by swagger UI.

  • Here you can see, we are calling a function simple_interest_rate() that is defined inside ./helpers/functions.py.

  • This function is responsible for making some calculations based on the parameter passed and returns the required value.

  • So, to add an endpoint, raise an issue regarding adding an endpoint. Once you are assigned, go through the project setup and set up the project on the local machine.

  • Then create a function in ./helpers/functions.py, passing the required parameters and returning the output as shown below

# Function to Calculate Simple Interest Rate
def simple_interest_rate(amount_paid:float, principle_amount:float, months:int):
    term = months/12
    interest_paid = amount_paid-principle_amount
    rate = (interest_paid*100)/(principle_amount*term)
    return rate

  • Cross-validate your endpoint output from some online calculators available or even manually.

  • After completing with creating the function, create the request validation in validators/request_validation.py like this -

class SimpleInterestRateRequest(BaseModel):
    amount_paid: float
    principle_amount: float
    months: int
  • Once the validation is done, create a task called simple_interest.py in ./tasks and the task like this -
def simple_interest_rate(amount_paid: float, principle_amount: float, months: int):
    try:
        rate = functions.simple_interest_rate(amount_paid, principle_amount, months)
        return {
            "Tag": "Simple Interest Rate",
            "Total amount paid": amount_paid,
            "Principle amount": principle_amount,
            "Interest Paid": amount_paid - principle_amount,
            "Interest Rate": f"{rate}%",
        }
    except:
        return HTTPException(status_code=status.HTTP_500_INTERNAL_SERVER_ERROR)
  • Once the task is ready, create an endpoint in the main.py file following all the good practices of Fast API.
@app.post(
    "/simple_interest_rate",
    tags=["simple_interest_rate"],
    description="Calculate simple interest rates",
)
def simple_interest_rate(request: SimpleInterestRateRequest):
    return simple_interest_rate_task(request.amount_paid, request.principle_amount, request.months)

+Also add your funtion in ENDPOINTS.md.

**POST** `/simple_interest_rate`

- Request body : `{
  "amount_paid": 20.23,
  "principle_amount": 30.9,
  "months": 5
}`
- Sample output

```py
{
  "Tag": "Simple Interest Rate",
  "Total amount paid": 20.23,
  "Principle amount": 30.9,
  "Interest Paid": -10.669999999999998,
  "Interest Rate": "-82.87378640776697%"
}

+Update the Docs

|---------------------------|----------------------------------------|---------------------------------------------------------|
| GET /simple_interest_rate | Calculate simple interest rates        | - `amount_paid` (float): The amount paid.               |
|                           |                                        | - `principle_amount` (float): The principle amount.     |
|                           |                                        | - `months` (int): The number of months.                 |

+ And that's it, you are now ready to make your pull request.

---