curl -X POST \
 /subscription-measurements \
 --header "Content-Type: application/json" \
 --header "Authorization: Bearer <token>" \
 --data '{
    "subscriptionItem": "1QEHKTJY9097X91J78YRJEA9E8",
    "measurementCode": "used_traffic"
}'

import requests

url = "https://coreapi.io/subscription-measurements"

payload = {
    "quantity": "10.239",
    "measuredAt": "2021-01-01T00:00:00Z",
    "subscription": "1QEHKTJY9097X91J78YRJEA9E8",
    "subscriptionItem": "1QEHKTJY9097X91J78YRJEA9E8",
    "measurementCode": "used_traffic"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    quantity: '10.239',
    measuredAt: '2021-01-01T00:00:00Z',
    subscription: '1QEHKTJY9097X91J78YRJEA9E8',
    subscriptionItem: '1QEHKTJY9097X91J78YRJEA9E8',
    measurementCode: 'used_traffic'
  })
};

fetch('https://coreapi.io/subscription-measurements', 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://coreapi.io/subscription-measurements",
  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([
    'quantity' => '10.239',
    'measuredAt' => '2021-01-01T00:00:00Z',
    'subscription' => '1QEHKTJY9097X91J78YRJEA9E8',
    'subscriptionItem' => '1QEHKTJY9097X91J78YRJEA9E8',
    'measurementCode' => 'used_traffic'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

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

curl_close($curl);

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