Order information in ActiveMerchant for PaypalExpress?

Question

Ruby on Rails

Hello!
Perhaps someone has experience with PayPal Express using ActiveMerchant. I am redirecting to PayPal using the following code:

def checkout_paypal<br>
    setup_response = gateway.setup_purchase(@course.price,<br>
      :ip                => request.remote_ip,<br>
      :return_url        => url_for(:action => 'confirm',<br>
                                      :course_id => params[:course_id], :only_path => false),<br>
      :cancel_return_url => url_for(:action => 'index', :only_path => false),<br>
      :description => I18n.t("payments.payment_for") + " " + @course.name,<br>
      :currency => "EUR"<br><br>
    )<br>
    redirect_to gateway.redirect_url_for(setup_response.token)<br>
  end<br>

Everything works, but when paying for the order, information about the order itself and its cost is not displayed (although I pass it as a hash: description). How do I tell PayPal to display this information to the user?
Thank you!