Payu\Component\Basket::add PHP Method

    public function add(Product $product)
    {
        $this->collection[$product->getCode()] = $product;
    }

 /**
  * @param Product $product
  * @return $this
  */
 public function addProduct(Product $product)
 {
     $this->basket->add($product);
     return $this;
 }