curl --request POST \
  --url https://integration.smartpng.com/api/validate \
  --header 'Content-Type: application/json' \
  --data '
{
  "api_key": "sp_live_abc123def456ghi789"
}
'

import requests

url = "https://integration.smartpng.com/api/validate"

payload = { "api_key": "sp_live_abc123def456ghi789" }
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({api_key: 'sp_live_abc123def456ghi789'})
};

fetch('https://integration.smartpng.com/api/validate', 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://integration.smartpng.com/api/validate",
  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([
    'api_key' => 'sp_live_abc123def456ghi789'
  ]),
  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;
}

HttpResponse<String> response = Unirest.post("https://integration.smartpng.com/api/validate")
  .header("Content-Type", "application/json")
  .body("{\n  \"api_key\": \"sp_live_abc123def456ghi789\"\n}")
  .asString();

using RestSharp;


var options = new RestClientOptions("https://integration.smartpng.com/api/validate");
var client = new RestClient(options);
var request = new RestRequest("");
request.AddJsonBody("{\n  \"api_key\": \"sp_live_abc123def456ghi789\"\n}", false);
var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content);