**Simple Stripe Subscription Concern** To use, simply drop this in `app/models/concerns`, include it in the model you want to search (`include Subscription`) and declare the `plan_for_stripe` and `description_for_stripe` helper methods. Use `save_with_payment` in place of `save` when creating a new resource with billing details; similarly, use `…

subscription.rb

module Subscription
  extend ActiveSupport::Concern

  included do
    attr_accessor :billing_card_token
  end

  def save_with_payment
    if valid?
      customer = ::Stripe::Customer.create(email: email,
                                           description: description_for_stripe,
                                           plan: plan_for_stripe,
                                           card: billing_card_token)
      self.billing_customer_token = customer.id
      save!
    end
  rescue ::Stripe::InvalidRequestError => e
    logger.error "Stripe error while creating customer: #{e.message}"
    errors.add :base, "There was a problem with your credit card."
    false
  end

  def update_payment
    if valid?
      customer = ::Stripe::Customer.new(billing_customer_token)
      customer.email = email
      customer.description = description_for_stripe
      customer.card = billing_card_token
      customer.save
    end
  rescue ::Stripe::InvalidRequestError => e
    logger.error "Stripe error while updating customer: #{e.message}"
    errors.add :base, "There was a problem with your credit card."
    false
  end

  def delete_from_stripe
    customer = ::Stripe::Customer.new(billing_customer_token)
    customer.delete
  rescue ::Stripe::InvalidRequestError => e
    logger.error "Stripe error while deleting customer: #{e.message}"
    errors.add :base, "There was a problem with your account."
    false
  end
end