<?php require "../vendor/autoload.php"; // create the credit query $creditQuery = new \ClearBooks\CreditQuery(); $creditQuery->accountCode = 7501001; $creditQuery->dateCreated = date('Y-m-d'); $creditQuery->description = 'Invoice Write Off'; $creditQuery->id = 213; $creditQuery->ledger = 'sales'; $client = new \ClearBooks\Client('demo'); $creditResponseStatus = $client->writeOff($creditQuery); var_dump($creditResponseStatus); /* Clearbooks_Soap_1_0_CreditResponseStatus Object ( [id] => 213 [msg] => Credit applied against invoice ) */