How to create a Stripe Subscription using Stripe Checkout & Sinatra

create_stripe_subscription_with_checkout.rb

# Michael Bianco <mike@suitesync.io>
# Description: Example of collecting a card and creating a subscription with Stripe
#              this subscription can integrated directly into NetSuite using http://suitesync.io/

# Usage:
#
#   export STRIPE_KEY=sk_test STRIPE_PUBLIC_KEY=pk_test_
#   gem install sinatra stripe pry
#   ruby create_stripe_subscription_with_checkout.rb
#   open http://localhost:4567

require 'sinatra'
require 'stripe'

require 'pry'

Stripe.api_key = ENV['STRIPE_KEY']
STRIPE_PUBLIC_KEY = ENV['STRIPE_PUBLIC_KEY']

template :index do
  <<EOL
  <form action="/pay" method="POST">
    <script
      src="https://checkout.stripe.com/checkout.js" class="stripe-button"
      data-key="<%= STRIPE_PUBLIC_KEY %>"
      data-amount="100"
      data-name="A Subscription"
      data-billing-address="true"
      data-email="subscription@example.com"
      data-label="Create Subscription"
      data-locale="auto">
    </script>
  </form>
EOL
end

get '/' do
  erb :index
end

post '/pay' do
  customer = Stripe::Customer.create(
    description: params[:stripeBillingName],
    email: params[:stripeEmail],

    metadata: {
      # NOTE there is where you can link this Stripe customer to a pre-existing NetSuite customer
      #      https://dashboard.suitesync.io/docs/field-customization#using-existing-records-or-existing-integrations
      # netsuite_customer_id: 123

      # alternatively, you can let SuiteSync create the customer for you and pass over any unique data about the customer
      # netsuite_web_address: "http://stripe.com"
    }
  )

  customer.sources.create(card: params[:stripeToken])

  plan = Stripe::Plan.create(
    amount: 100_00,
    interval: 'month',
    currency: 'usd',

    name: 'A Example Plan',
    id: "random_#{Time.now.to_i}",

    # you can provide an ID of an existing item in Netsuite you'd like to use, or let SuiteSync create an item for you
    # https://dashboard.suitesync.io/docs/field-customization
    # metadata: {
    #   netsuite_non_inventory_sale_item_id: 123
    # }
  )

  # Subscriptions are automatically pushed to NetSuite as an invoice each billing period
  # https://dashboard.suitesync.io/docs/subscriptions
  customer.subscriptions.create({
    plan: plan.id,

    # NOTE if you are using Avalara's integration with Stripe subscriptions you'll
    #      need to make sure this option is passed when the subscription is created
    # pay_immediately: false,

    # data specified on the subscription can be linked to each subsequent invoice created from this subscription
    # https://dashboard.suitesync.io/docs/field-customization
    # metadata: {
    #   netsuite_class_id: 123,
    #   netsuite_department_id: 123
    # }
  })

  # An invoice is automatically generated and pushed to Stripe
  invoice = customer.invoices.first

  "https://dashboard.stripe.com/test/invoices/#{invoice.id}"
end