curl -X POST https://api2.ecomailapp.cz/lists \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "New list name",
    "from_name": "Ecomailapp.cz",
    "from_email": "test@ecomailapp.cz",
    "reply_to": "support@ecomail.cz"
  }'

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/lists');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'key: YOUR_API_KEY',
    'Content-Type: application/json',
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
    'name' => 'New list name',
    'from_name' => 'Ecomailapp.cz',
    'from_email' => 'test@ecomailapp.cz',
    'reply_to' => 'support@ecomail.cz',
]));
$response = curl_exec($ch);
curl_close($ch);

{
  "name": "New list name",
  "id": 2
}