curl "https://api2.ecomailapp.cz/tracker/transaction?shop=mujshop.cz&per_page=100&page=1" \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json"

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/tracker/transaction?shop=mujshop.cz&per_page=100&page=1');
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);

{
  "current_page": 1,
  "data": [
    {
      "id": 2220,
      "order_id": "5301",
      "email": "foo@bar.cz",
      "shop": "mujshop.cz",
      "amount": 2000,
      "timestamp": "2023-02-15 09:40:56",
      "status": null,
      "items": [
        {
          "code": "product code 1",
          "title": "product name 1",
          "categories": ["product category 1"],
          "price": 400,
          "amount": "1"
        }
      ]
    }
  ],
  "per_page": 100,
  "total": 234
}