copy_stripe_object_metadata_using_webhooks.rb

# Mike Bianco <mike@suitesync.io>

# Description: Example of using Stripe webhooks to copy a parent subscription
#              metadata field to a Stripe-generated charge's metadata

require 'stripe'
require 'sinatra'

Stripe.api_key = "sk_test_"

# Listen to Stripe events using webhooks
# 
#   - https://stripe.com/docs/webhooks
#   - https://dashboard.stripe.com/account/webhooks

# This example uses sinatra. You can easily use rails.
# post '/stripe/webhooks' => 'stripe_webhooks#consume'

post "/stripe/webhooks" do
  event_json = JSON.parse(request.body.read)

  # https://stripe.com/docs/api#list_events
  # charge.pending is fired whenever a charge is created

  if event_json['type'] == 'charge.pending'
    stripe_charge = Stripe::Charge.retrieve(event_json['id'])

    if stripe_charge.invoice
      stripe_invoice = Stripe::Invoice.retrieve(stripe_charge.invoice)
      stripe_subscription = Stripe::Subscription.retrieve(stripe_invoice.subscription)

      stripe_charge.metadata['order_number'] = stripe_subscription.metadata['order_number']
      stripe_charge.save
    end

  end

  status 200
end