if order.sale.present?
      order.promo_chain.promo_code_id = promo_code.id
      order.promo_chain.save!
      order.sale = order.promo_chain.promo_code.sale_percent
      order.save!
    elsif params[:promo_sale] && promo_code
      PromoCodes::Sale::AcceptCode.new(current_student, promo_code, order_id: params[:order_id]).call
    end