Example of using Stripe Subscriptions to manage simplistic usage based billing

simple_usage_billing_with_stripe.rb

# Mike Bianco <mike@suitesync.io>
# Description: Example of using Stripe Subscriptions to manage simplistic usage based billing
# Link: https://gist.github.com/iloveitaly/e56a9487dfa85e08bdf63bfcfcd68dad

require 'stripe'

Stripe.api_key = ENV['STRIPE_KEY']

plan = (Stripe::Plan.retrieve('example-usage-plan') rescue nil)

if !plan
  plan = Stripe::Plan.create(
    id: 'example-usage-plan',
    name: 'Example Usage Based Billing Plan',
    amount: 10_00,
    interval: 'month',
    currency: 'usd',
  )
end

# create customer and attach a payment option
customer = Stripe::Customer.create
customer.sources.create(source: 'tok_visa')

# create the initial subscription with a quantity of 2
subscription = customer.subscriptions.create(
  quantity: 2,
  plan: plan.id
)

# wait a minute, a day, week, etc until the user requests a plan change
sleep(60)

# update the quantity on the plan. Stripe manages proration easily
subscription.quantity = 3
subscription.save

# take a look at the customer in Stripe to visually see how the subscriptions are created
puts "Customer: #{customer.id}"