## 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

```bash
# 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](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.

```jsx
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.