<?php require "../vendor/autoload.php"; // create the payment $payment = new \ClearBooks\RemovePayment(); $payment->id = 620; $payment->type = "sales"; $client = new \ClearBooks\Client('demo'); $paymentReturn = $client->voidPayment($payment); var_dump($paymentReturn); /* Clearbooks_Soap_1_0_ResponseStatus Object ( [success] => 1 [msg] => Voiding this payment was successful ) */