curl -X POST https://api2.ecomailapp.cz/pipelines/1/trigger \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "email": "foo@bar.cz"
  }'

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/pipelines/1/trigger');
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([
    'email' => 'foo@bar.cz',
]));
$response = curl_exec($ch);
curl_close($ch);

{
  "email": "foo@bar.cz"
}