curl https://api2.ecomailapp.cz/lists/1 \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

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

{
  "list": {
    "id": "1",
    "name": "List Name",
    "from_name": "Sender Name",
    "from_email": "sender@example.com",
    "reply_to": "reply@example.com",
    "sub_success_page": null,
    "sub_confirmed_page": "https://www.example.com/confirm?email=*|EMAIL|*",
    "unsub_page": null,
    "double_optin": true,
    "conf_subject": "Confirmation Subject",
    "conf_message": "Please confirm your subscription: *|SUBCONFIRM|*",
    "custom_fields": {
      "date1": { "type": "string", "name": "Date Field" },
      "size": { "type": "int", "name": "Size Field" }
    },
    "groups": {
      "grp_5e83080ebb988": {
        "name": "Group 1",
        "category": [{ "name": "Category A", "id": "plnQNPzCz" }],
        "id": "grp_1",
        "type": "select"
      }
    },
    "segments": {
      "5c36008811e45": {
        "name": "Segment 1",
        "id": "5c36008811e45"
      }
    },
    "active_subscribers": 100,
    "created": "26.6.2018"
  },
  "subscribers": {
    "unknown": 0,
    "subscribed": 375,
    "unsubscribed": 143,
    "soft_bounced": 9,
    "hard_bounced": 11,
    "complained": 1,
    "unconfirmed": 25
  }
}