check_invoice_payer.php

print_r($_REQUEST);
writeToLog($_REQUEST, 'new');

function writeToLog($data, $title = '') {
 $log = "\n------------------------\n";
 $log .= date("Y.m.d G:i:s") . "\n";
 $log .= (strlen($title) > 0 ? $title : 'DEBUG') . "\n";
 $log .= print_r($data, 1);
 $log .= "\n------------------------\n";
 file_put_contents(getcwd() . '/hook.log', $log, FILE_APPEND);
 return true;
}


require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include.php");
//require_once($_SERVER["DOCUMENT_ROOT"]."/bitrix/modules/main/include/prolog_before.php");

use Bitrix\Main\Loader;
Loader::includeModule("iblock");
Loader::includeModule('crm');
use \Bitrix\Iblock;
use \Bitrix\Crm;

$request = $_REQUEST;
$invoice_id = $request['data']['FIELDS']['ID'];
$invalid_status = [ "STATUS_ID" => "N" ];

$arOrder = ["ID" => "DESC"];
$arFilter = ["ID" => $invoice_id];
$arSelect = ["STATUS_ID", "EMP_STATUS_ID", "EMP_PAYED_ID", "CREATED_BY", "RESPONSIBLE_ID"];
$getInvoice = CCrmInvoice::GetList($arOrder, $arFilter, false, false, $arSelect);
$arinvoice = $getInvoice->fetch();

$status = $arinvoice['STATUS_ID'];
$status_change = $arinvoice['EMP_STATUS_ID'];
$pay_change = $arinvoice['EMP_PAYED_ID'];
$assigned = $arinvoice['RESPONSIBLE_ID'];

if ($status == 'P' || $status == 'D') {
        if ($assigned == '100') {
                        $invoice = new CCrmInvoice($invoice_id);
                        $invoice->Update($invoice_id, $invalid_status); //set status 'NEW'
        }
}