curl -X DELETE https://api2.ecomailapp.cz/coupons/delete \
  -H "key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "folderId": 1,
    "codes": ["code1", "code2", "code3", "code4"]
  }'

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api2.ecomailapp.cz/coupons/delete');
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([
    'folderId' => 1,
    'codes' => ['code1', 'code2', 'code3', 'code4'],
]));
$response = curl_exec($ch);
curl_close($ch);

{
  "deleted": 4,
  "invalid": 0
}