curl -X PUT https://api2.ecomailapp.cz/templates/1234 \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Update Template",
    "inline_css": true,
    "html": "<b>Template HTML</b>"
  }'

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/templates/1234');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'key: YOUR_API_KEY',
    'Content-Type: application/json',
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
    'name' => 'Update Template',
    'inline_css' => true,
    'html' => '<b>Template HTML</b>',
]));
$response = curl_exec($ch);
curl_close($ch);

{
  "id": 1234,
  "name": "Update Template",
  "html": "<b>Template HTML</b>",
  "folder": 0,
  "campaign_id": null,
  "created_at": "2024-02-12 15:13:16",
  "updated_at": "2024-02-12 16:45:30"
}