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'PRODUCT_PROVIDER_CLASS' => \Bitrix\Catalog\Product\Basket::getDefaultProviderName()

$products = array(
   array(
      'PRODUCT_ID' => 1811, 
      'NAME' => 'Товар 1', 
      'PRICE' => 500, 
      'CURRENCY' => 'RUB', 
      'QUANTITY' => 5,
      'PRODUCT_PROVIDER_CLASS' => \Bitrix\Catalog\Product\Basket::getDefaultProviderName()
   )
);