How to correctly specify the type of paid product Service?

Question

1C-Bitrix

Hello.
When setting up payment from the site and printing checks, I ran into a problem:
the type of paid product is printed in the checks as a Product, although the payment system settings indicate that this will be a service.
Fiscal data format is 1.05
The payment system uses the Sberbank module sberbank.ecom
Communication with the Sberbank TP did not bring any results.
Maybe someone faced such a problem.
Screenshot of payment system settings

Answer 1

No matter how surprising, but the correct answer to my question was given by Bitrix TP. Well, not that true, but the problem is solved in this way:
Good afternoon!
Starting from version 18.5.10 of the online store module, in the OnSaleCheckPrepareData event handler for goods and delivery, in the PAYMENT_OBJECT field, you can change the type of settlement object
https://dev.1c-bitrix.ru/api_d7/bitrix/sale/events...
Possible PAYMENT_OBJECT field values:
\Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_COMMODITY // product
\Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_EXCISE // excise
\Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_JOB // work
\Bitrix\Sale \Cashbox\Check::PAYMENT_OBJECT_SERVICE // service
\Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_PAYMENT // payment
And indeed, I washed down the handler, in it for all goods I put down the Service Type \Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_SERVICE

/**
     * @param array $a
     * @param string $type
     * @return array
     */
    public static function courseCheckPrepareDataHandler(array $a, string $type) : array{

        if(!empty($a['PRODUCTS'])){
            foreach($a['PRODUCTS'] as $key => $product){
                $a['PRODUCTS'][$key]['PAYMENT_OBJECT'] = \Bitrix\Sale\Cashbox\Check::PAYMENT_OBJECT_SERVICE;
            }
        }

        return $a;
    }

And the long-awaited inscription Service appears in the check.
I hope that my experience will be useful to someone.

Answer 2

where to start?
Bitrix also wrote to us:
"... you need to add the processing of the OnSaleCheckPrepareData event"
but I don’t know how to add it .. tell
me This should be done in each payment system installed on the site? Is it possible to display the possibility of choosing a Product-Service in a product property? Since there is a part of finished goods, the rest are exhibited for example and will be made to order according to the buyer's size.