curl --request POST \
  --url http://localhost:8081/inject \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 5000,
  "currency": "USD",
  "source": "balance_123",
  "destination": "balance_456",
  "reference": "txn_ref_001",
  "description": "High-value transfer",
  "meta_data": {
    "merchant_category": "finance",
    "country": "US"
  }
}
'

import requests

url = "http://localhost:8081/inject"

payload = {
    "amount": 5000,
    "currency": "USD",
    "source": "balance_123",
    "destination": "balance_456",
    "reference": "txn_ref_001",
    "description": "High-value transfer",
    "meta_data": {
        "merchant_category": "finance",
        "country": "US"
    }
}
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: 5000,
    currency: 'USD',
    source: 'balance_123',
    destination: 'balance_456',
    reference: 'txn_ref_001',
    description: 'High-value transfer',
    meta_data: {merchant_category: 'finance', country: 'US'}
  })
};

fetch('http://localhost:8081/inject', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "8081",
  CURLOPT_URL => "http://localhost:8081/inject",
  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' => 5000,
    'currency' => 'USD',
    'source' => 'balance_123',
    'destination' => 'balance_456',
    'reference' => 'txn_ref_001',
    'description' => 'High-value transfer',
    'meta_data' => [
        'merchant_category' => 'finance',
        'country' => 'US'
    ]
  ]),
  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 := "http://localhost:8081/inject"

	payload := strings.NewReader("{\n  \"amount\": 5000,\n  \"currency\": \"USD\",\n  \"source\": \"balance_123\",\n  \"destination\": \"balance_456\",\n  \"reference\": \"txn_ref_001\",\n  \"description\": \"High-value transfer\",\n  \"meta_data\": {\n    \"merchant_category\": \"finance\",\n    \"country\": \"US\"\n  }\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("http://localhost:8081/inject")
  .header("Content-Type", "application/json")
  .body("{\n  \"amount\": 5000,\n  \"currency\": \"USD\",\n  \"source\": \"balance_123\",\n  \"destination\": \"balance_456\",\n  \"reference\": \"txn_ref_001\",\n  \"description\": \"High-value transfer\",\n  \"meta_data\": {\n    \"merchant_category\": \"finance\",\n    \"country\": \"US\"\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://localhost:8081/inject")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"amount\": 5000,\n  \"currency\": \"USD\",\n  \"source\": \"balance_123\",\n  \"destination\": \"balance_456\",\n  \"reference\": \"txn_ref_001\",\n  \"description\": \"High-value transfer\",\n  \"meta_data\": {\n    \"merchant_category\": \"finance\",\n    \"country\": \"US\"\n  }\n}"

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

{
  "error": "<string>",
  "code": "<string>"
}

{
  "error": "<string>",
  "code": "<string>"
}