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filed_payments

Coding exercise:

Write a Flask Web API with only 1 method called “ProcessPayment” that receives a request like this

-CreditCardNumber(mandatory, string, it should be a valid credit card number)
-CardHolder (mandatory, string)
-ExpirationDate (mandatory, DateTime, it cannot be in the past)
-SecurityCode (optional, string, 3 digits)
-Amount (mandatoy decimal, positive amount)

The response of this method should be 1 of the followings based on

-Payment is processed: 200 OK
-The request is invalid: 400 bad request
-Any error: 500 internal server error

The payment could be processed using different payment providers (external services)called:

-PremiumPaymentGateway
-ExpensivePaymentGateway
-CheapPaymentGateway.

The payment gateway that should be used to process each payment follows the next set of business rules:

a)If the amount to be paid is less than £20, use CheapPaymentGateway.
b)If the amount to be paid is £21-500, use ExpensivePaymentGateway if available. Otherwise, retry only once with CheapPaymentGateway.
c)If the amount is > £500, try only PremiumPaymentGateway and retry up to 3 times in case payment does not get processed.

How to run the project

Have pipenv installed in your system

run the following command to do so. 1. clone the project from git on your system

git clome https://github.com/sahasrara62/filed_payments.git
  1. cd filed_payments
  2. run command pipenv install
  3. run to go in virtual environment, inside the project run command pipenv shell
  4. run command to run the flask server flask run
  5. To exit server run ctrl+c
  6. To exit the virtual env run command in terminal deactivate

How to test the application

  1. run the server first using above step
  2. in seperate terminal, run cd application/test ie go to test folder
  3. Activate python environment, pipenv shell
  4. run comands: pytest test_external_payment.py

Shortcoming OR consideration

  1. ExpirationDate format is yyyy/mm/dd not mm/dd as found in the credit card usually.
  2. Testing of external payment gate should be done with there api (i don't know how to test that part without there api, if anyone know i would learn to do that).

Note

if you find this project help you to create the assignment in anyway, please fork or click on watch this project.

Filed people are crooked and shit people. Better to have a proper job from big tech giants.