charges_controller.rb

  def create
    @amount = params[:amount]

    @amount = @amount.gsub('$', '').gsub(',', '')

    begin
      @amount = Float(@amount).round(2)
    rescue
      flash[:error] = 'Charge not completed. Please enter a valid amount in USD ($).'
      redirect_to new_charge_path
      return
    end

    @amount = (@amount * 100).to_i # Must be an integer!

    if @amount < 500
      flash[:error] = 'Charge not completed. Donation amount must be at least $5.'
      redirect_to new_charge_path
      return
    end

    customer = Stripe::Customer.create(
        :email => params[:stripeEmail],
        :source  => params[:stripeToken]
      )

    if params[:subscription] == 'no'
      Stripe::Charge.create(
        :amount => @amount,
        :currency => 'usd',
        :source => params[:stripeToken],
        :description => 'Donation'
      )
    elsif params[:subscription] == 'yes'

      Stripe::Subscription.create(
        :customer => customer.id,
        items: [{plan: params[:plan]}]
      )
    end


  rescue Stripe::CardError => e
    flash[:error] = e.message
    redirect_to new_charge_path
  end
end