subscription.rb

class Subscription
  def initialize(stripe_id)
    @stripe_id = stripe_id
  end

  def name
    subscription.plan.name
  end

  def amount
    subscription.plan.amount / 100
  end

  private

  attr_reader :stripe_id

  def subscription
    @subscription ||= customer.subscriptions.data.first
  end

  def customer
    @customer ||= Stripe::Customer.retrieve(stripe_id)
  end
end