curl --request POST \
  --url https://api.malvo.io/auth \
  --header 'Content-Type: application/json' \
  --data '
{
  "clientId": "b6e3a4c2-1234-4d5e-9f00-abcdefabcdef",
  "clientSecret": "s3cr3t-opaque-string"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    clientId: 'b6e3a4c2-1234-4d5e-9f00-abcdefabcdef',
    clientSecret: 's3cr3t-opaque-string'
  })
};

fetch('https://api.malvo.io/auth', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.malvo.io/auth"

payload = {
    "clientId": "b6e3a4c2-1234-4d5e-9f00-abcdefabcdef",
    "clientSecret": "s3cr3t-opaque-string"
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.malvo.io/auth",
  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([
    'clientId' => 'b6e3a4c2-1234-4d5e-9f00-abcdefabcdef',
    'clientSecret' => 's3cr3t-opaque-string'
  ]),
  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;
}