Disable Order Confirmation by UpgradeProduct

[Plambee]

Hi,

does anybody know how I can disable an Order Confirmation when I use the API Command "UpgradeProduct" like this?

$command = 'UpgradeProduct';
  $postData = array(
    'serviceid' => $serviceid,
    'paymentmethod' => $paymentmethod,
    'type' => 'product',
    'newproductbillingcycle' => 'Free Account',
    'newproductid' => $newproductid,
);

$results = localAPI($command, $postData);

The API Command "UpgradeProduct" has no "disable_mail" parameter and the Hookpoint "EmailPreSend" gives me as relid only the clientid, which does not help me. I would like to deactivate the order confirmation only if the product is changed by API.

 

Thanks!