curl -X DELETE https://api2.ecomailapp.cz/tracker/transaction/delete-bulk \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "transaction_data": [
      {"order_id": "1000001"},
      {"order_id": "1000025", "shop": "someshop.com"}
    ]
  }'

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/tracker/transaction/delete-bulk');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'DELETE');
curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'key: YOUR_API_KEY',
    'Content-Type: application/json',
]);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
    'transaction_data' => [
        ['order_id' => '1000001'],
        ['order_id' => '1000025', 'shop' => 'someshop.com'],
    ],
]));
$response = curl_exec($ch);
curl_close($ch);

{
  "deleted": 2
}

{
  "errors": {
    "transaction_data": ["The transaction data may not have more than 1000 items."]
  }
}