<?php require "../vendor/autoload.php"; // create the payment $payment = new \ClearBooks\Payment(); $payment->amount = 29.99; $payment->accountingDate = date('Y-m-d'); $payment->bankAccount = 7502001; $payment->description = 'Invoice Payment'; $payment->entityId = 22; $payment->invoices = 212; $payment->paymentMethod = 1; $payment->type = 'sales'; $client = new \ClearBooks\Client('demo'); $paymentReturn = $client->createPayment($payment); print_r($paymentReturn); /* Clearbooks_Soap_1_0_PaymentReturn Object ( [payment_id] => 618 ) */