stripe setup intent ruby

$setup_intent = Stripe::SetupIntent.create({
    usage: 'on_session', # The default usage is off_session
  })

  def payment
    @setup_intent=$setup_intent
    #if current_user.stripe_id
      # stripe_customer=Stripe::Customer.retrieve(current_user.stripe_id)
      # default_card_id = stripe_customer.default_source
      # @default_card = stripe_customer.sources[:data].find {|x| x[:id] == default_card_id }
    #end
  end

def add_card
    if current_user.stripe_id.blank?
      setup_intent = Stripe::SetupIntent.retrieve($setup_intent.id)
      customer = Stripe::Customer.create(
        payment_method: setup_intent.payment_method,
        email: current_user.email,
        name: current_user.fullname
      )
    #   #current_user.stripe_id = customer.id
    #   #current_user.save

    #   # Add Credit Card to Stripe
    #   #customer.sources.create(source: params[:stripePaymentMethod])
    # else
    #   customer = Stripe::Customer.retrieve(current_user.stripe_id)
    #   #customer.source = params[:stripePaymentMethod]
    #   customer.save
    end

    flash[:notice] = "Votre carte est enregistrée."
    redirect_to payment_method_path
  rescue Stripe::CardError => e
    flash[:alert] = e.message
    redirect_to payment_method_path
  end