converterdocumentpaymentinvoice.php

См. документацию.

<?php
 
 
namespace Bitrix\Sale\Exchange\OneC;
 
 
class ConverterDocumentPaymentInvoice extends ConverterDocumentPayment
{
    public function getPaySystemId($fields)
    {
        $paySystemId = 0;
        if(isset($fields['PAY_SYSTEM_ID']))
        {
            $paySystemId = $fields['PAY_SYSTEM_ID'];
        }
 
        return $paySystemId;
    }
}