curl https://api2.ecomailapp.cz/transactional/stats \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/transactional/stats');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'key: YOUR_API_KEY',
    'Content-Type: application/json',
]);
$response = curl_exec($ch);
curl_close($ch);

{
  "stats": {
    "open_rate": 85.71,
    "click_rate": 0,
    "bounce_rate": 0,
    "count_injected": 21,
    "count_accepted": 21,
    "count_delivered": 21,
    "count_unique_rendered": 18,
    "count_rendered": 126,
    "count_clicked": 0,
    "count_unique_clicked": 0,
    "count_bounce": 0,
    "count_hard_bounce": 0,
    "count_soft_bounce": 0,
    "count_rejected": 0,
    "count_spam_complaint": 0
  }
}