curl --request POST \
  --url https://api.example.com/exchange/fx/convert \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 1000,
  "rate_id": "2f939fe5-fb7b-4234-8b73-761a848d13af",
  "reference": "6b35c97f-99e3-4310-af92-2bb0404cfa5a",
  "source_currency": "USD",
  "target_currency": "NGN"
}
'

import requests

url = "https://api.example.com/exchange/fx/convert"

payload = {
    "amount": 1000,
    "rate_id": "2f939fe5-fb7b-4234-8b73-761a848d13af",
    "reference": "6b35c97f-99e3-4310-af92-2bb0404cfa5a",
    "source_currency": "USD",
    "target_currency": "NGN"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    amount: 1000,
    rate_id: '2f939fe5-fb7b-4234-8b73-761a848d13af',
    reference: '6b35c97f-99e3-4310-af92-2bb0404cfa5a',
    source_currency: 'USD',
    target_currency: 'NGN'
  })
};

fetch('https://api.example.com/exchange/fx/convert', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.example.com/exchange/fx/convert",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'amount' => 1000,
    'rate_id' => '2f939fe5-fb7b-4234-8b73-761a848d13af',
    'reference' => '6b35c97f-99e3-4310-af92-2bb0404cfa5a',
    'source_currency' => 'USD',
    'target_currency' => 'NGN'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.example.com/exchange/fx/convert"

	payload := strings.NewReader("{\n  \"amount\": 1000,\n  \"rate_id\": \"2f939fe5-fb7b-4234-8b73-761a848d13af\",\n  \"reference\": \"6b35c97f-99e3-4310-af92-2bb0404cfa5a\",\n  \"source_currency\": \"USD\",\n  \"target_currency\": \"NGN\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.example.com/exchange/fx/convert")
  .header("Content-Type", "application/json")
  .body("{\n  \"amount\": 1000,\n  \"rate_id\": \"2f939fe5-fb7b-4234-8b73-761a848d13af\",\n  \"reference\": \"6b35c97f-99e3-4310-af92-2bb0404cfa5a\",\n  \"source_currency\": \"USD\",\n  \"target_currency\": \"NGN\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/exchange/fx/convert")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"amount\": 1000,\n  \"rate_id\": \"2f939fe5-fb7b-4234-8b73-761a848d13af\",\n  \"reference\": \"6b35c97f-99e3-4310-af92-2bb0404cfa5a\",\n  \"source_currency\": \"USD\",\n  \"target_currency\": \"NGN\"\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "correlation_id": "7da742ea-a1bc-11ee-b907-560f156a658b",
    "created_at": "2021-01-01T00:00:00Z",
    "customer": {
      "email": "customer@email.com",
      "id": "1",
      "name": "User 1",
      "type": "user"
    },
    "id": "7da8e726-a1bc-11ee-80cf-560f156a658b",
    "provider": {
      "email": "provider@email.com",
      "id": "1",
      "name": "Provider 1",
      "type": "provider"
    },
    "source_amount": {
      "amount": 1,
      "currency": "USD"
    },
    "status": "success",
    "symbol": "USD-NGN",
    "target_amount": {
      "amount": 1000,
      "currency": "NGN"
    },
    "updated_at": "2021-01-01T00:00:00Z"
  }
}