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Introduction

Explore this code and be ready to tell us what is good or/and bad

Installation

npm install
npm install -g ts-node
Insert database connection information into ormconfig.json file
Run “db-build”

Running the app

# development
$ npm run start

# watch mode
$ npm run start:dev

## Test

```bash
# unit tests
$ npm run test

# e2e tests
$ npm run test:e2e

# test coverage
$ npm run test:cov

Task original

Create a RESTful API with an endpoint for transaction commission calculation. The API must use JSON format for requests and responses.

Request (Transaction) examples

1st example

{
  "date": "2021-01-01",
  "amount": "100.00",
  "currency": "EUR",
  "client_id": 42
}

2nd example

{
  "date": "2021-01-01",
  "amount": "200.40",
  "currency": "USD",
  "client_id": 42
}

Response (Commission) example

{
  "amount": "0.05",
  "currency": "EUR"
}

Commission response must always be in Euros. Please use a currency rates API (https://api.exchangerate.host/2021-01-01) for transactions in currency other than Euros.

Commission calculation rules

The lowest commission shall be used if there are multiple rules matching.

Rule #1: Default pricing

By default the price for every transaction is 0.5% but not less than 0.05€.

Rule #2: Client with a discount

Transaction price for the client with ID of 42 is 0.05€ (unless other rules set lower commission).

Rule #3: High turnover discount

Client after reaching transaction turnover of 1000.00€ (per month) gets a discount and transaction commission is 0.03€ for the following transactions.

See below an example in CSV format of rules applied to various transactions.

client_id,date,amount,currency,commission_amount,commission_currency
42,2021-01-02,2000.00,EUR,0.05,EUR
1,2021-01-03,500.00,EUR,2.50,EUR
1,2021-01-04,499.00,EUR,2.50,EUR
1,2021-01-05,100.00,EUR,0.50,EUR
1,2021-01-06,1.00,EUR,0.03,EUR
1,2021-02-01,500.00,EUR,2.50,EUR

Testing

Please write at least one unit and one integration test.

Remarks

You can use any language and any framework. We expect you to show knowledge of your chosen language's ecosystem (frameworks, 3rd party libraries, etc.)
Code must follow good practices (such as SOLID, design patterns, etc.) and be easily extendable in case we need to add additional commission calculation rules in the future
Please include README.md with instructions how to run your completed task.

Submitting the task

Make sure you don't mention [REDACTED] anywhere in the code or repository name.
Please include how long it took for you to do the task.

2.7 KiB Raw Blame History