curl -X POST https://api2.ecomailapp.cz/campaigns/1/send \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

$campaignId = 1;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://api2.ecomailapp.cz/campaigns/{$campaignId}/send");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'key: YOUR_API_KEY',
    'Content-Type: application/json',
]);
$response = curl_exec($ch);
curl_close($ch);

[
  {
    "id": 1,
    "title": "My first campaign",
    "from_name": "From name",
    "from_email": "from@foo.cz",
    "reply_to": "reply@bar.cz",
    "subject": "First hello",
    "recepient_lists": [1, 2],
    "template_type": "html",
    "campaign_type": "email"
  }
]