/**
  * Copy an existing RecurringOrder to a new date and delete the existing recurring order AND ALL INVOICES/ORDERS ATTACHED
  * @param int $orderId The ID of the RecurringOrder to replicate
  * @param string $newStartDate String date of when to start the new RecurringOrder
  * @param string $nextBillDate Optional, string date of when to set the NextBillingDate on the new RecurringOrder
  * @return bool|Infusionsoft_RecurringOrder The newly created RecurringOrder object, or false if there was a problem.
  */
 public static function rescheduleRecurringOrderWithDelete($orderId, $newStartDate, $nextBillDate = null)
 {
     $newOrder = self::rescheduleRecurringOrder($orderId, $newStartDate, $nextBillDate);
     // Make API call to delete the old subscription, THIS REMOVES ALL INVOICES AND ORDERS AS WELL!
     try {
         Infusionsoft_InvoiceService::deleteSubscription($orderId);
     } catch (Exception $e) {
         CakeLog::write('error', "Problem deleting existing subscription.  Id: {$orderId}, Error: " . $e->getMessage());
     }
     return $newOrder;
 }
<form>
            subscriptionId: <input type="text" name="subscriptionId" value="<?php 
if (isset($_REQUEST['subscriptionId'])) {
    echo htmlspecialchars($_REQUEST['subscriptionId']);
}
?>
"><br/>
    <input type="submit">
<input type="hidden" name="go">
</form>
<?php 
include '../infusionsoft.php';
include 'testUtils.php';
if (isset($_REQUEST['go'])) {
    $out = Infusionsoft_InvoiceService::deleteSubscription($_REQUEST['subscriptionId']);
    var_dump($out);
}