curl 'https://api2.ecomailapp.cz/campaigns?sort_by=sent_at&sort_dir=desc' \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/campaigns?sort_by=sent_at&sort_dir=desc');
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);

[
  {
    "id": 1,
    "from_name": "From name",
    "from_email": "from@foo.cz",
    "reply_to": "reply@bar.cz",
    "title": "My first campaign",
    "subject": "First hello",
    "sent_at": "2014-09-08 22:04:03",
    "recipients": 1,
    "status": 3,
    "scheduled_at": null,
    "template_id": 62,
    "archive_url": "https://foo.ecomailapp.cz/campaigns/render/1/randomhashhere"
  }
]