code: def add(self, quote_id, product_data, store_view=None):
          
          return bool(
              self.call('cart_product.add', [quote_id, product_data, store_view])
          )
docs: Allows you to add one or more products to the shopping cart (quote).
  
          :param quote_id: Shopping cart ID (quote ID)
          :param product_data, list of dicts of product details, example
              [
                  {
                      'product_id': 1,
                      'qty': 2,
                      'options': {
                          'option_1': 'value_1',
                          'option_2': 'value_2',
                          ...
                      },
                      'bundle_option': {},
                      'bundle_option_qty': {},
                      'links': [],
                  },
                  {
                      'sku': 'S0012345',
                      'qty': 4,
                  },
              ]
          :param store_view: Store view ID or code
          :return: boolean, True on success (if the product is added to the
                  shopping cart)