Форум

$product = array('PRODUCT_ID' => 1296713, 'QUANTITY' => 1);
$result = \Bitrix\Catalog\Product\Basket::addProductToBasket($basket, $product, ['SITE_ID' => 's1']);

$basket->save();

CModule::IncludeModule('sale');
use Bitrix\Sale\Basket;

$basket = Basket::create('s1');

global $DB;
$arFields = array(
   '=DATE_INSERT' => $DB->GetNowFunction(),
   '=DATE_UPDATE' => $DB->GetNowFunction(),
   'USER_ID' => 1188532,
   'CODE' => md5(time().randString(10)),
);
$newFuser = \CSaleUser::_Add($arFields);

$basket->setFUserId($newFuser);

$product = array('PRODUCT_ID' => 1296713, 'QUANTITY' => 1);
$result = \Bitrix\Catalog\Product\Basket::addProductToBasket($basket, $product, []);

$basket->save(); //Не указана валюта товара

[MODULE] => catalog
[BASE_PRICE] => 0
[CAN_BUY] => Y
[CUSTOM_PRICE] => N
[PRODUCT_ID] => 1296713
[XML_ID] => bx_620e17c37fa43
[LID] => s1
[SORT] => 100
[NAME] => Кровать с ПМ 200*180 VIRGINIO Тк. Casanova Milk
[QUANTITY] => 1
[PRODUCT_XML_ID] => 1740#9b4e50d425e8aa2d443287eee0ccfd18
[DETAIL_PAGE_URL] => 
[BARCODE_MULTI] => N
[WEIGHT] => 0
[DIMENSIONS] => Array
     (
         [WIDTH] => 
         [HEIGHT] => 
         [LENGTH] => 
)
[MEASURE_NAME] => шт
[MEASURE_CODE] => 796