サブスクリプションの実装を構築する

# Set your secret key. Remember to switch to your live secret key in production.
# See your keys here: https://dashboard.stripe.com/apikeys
Stripe.api_key = 
'sk_test_4eC39HqLyjWDarjtT1zdp7dc'

# The price ID passed from the front end.
#   price_id = params['priceId']
price_id = '{{PRICE_ID}}'

session = Stripe::Checkout::Session.create({
  success_url: 'https://example.com/success.html?session_id={CHECKOUT_SESSION_ID}',
  cancel_url: 'https://example.com/canceled.html',
  mode: 'subscription',
  line_items: [{
    # For metered billing, do not pass quantity
    quantity: 1,
    price: price_id,
  }],
})

# Redirect to the URL returned on the session
#   redirect session.url, 303

# Set your secret key. Remember to switch to your live secret key in production.
# See your keys here: https://dashboard.stripe.com/apikeys
Stripe.api_key = 
'sk_test_4eC39HqLyjWDarjtT1zdp7dc'

post '/webhook' do
  webhook_secret = 
'{{STRIPE_WEBHOOK_SECRET}}'
  payload = request.body.read
  if !webhook_secret.empty?
    # Retrieve the event by verifying the signature using the raw body and secret if webhook signing is configured.
    sig_header = request.env['HTTP_STRIPE_SIGNATURE']
    event = nil

    begin
      event = Stripe::Webhook.construct_event(
        payload, sig_header, webhook_secret
      )
    rescue JSON::ParserError => e
      # Invalid payload
      status 400
      return
    rescue Stripe::SignatureVerificationError => e
      # Invalid signature
      puts '⚠️  Webhook signature verification failed.'
      status 400
      return
    end
  else
    data = JSON.parse(payload, symbolize_names: true)
    event = Stripe::Event.construct_from(data)
  end
  # Get the type of webhook event sent
  event_type = event['type']
  data = event['data']
  data_object = data['object']

  case event_type
  when 'checkout.session.completed'
    # Payment is successful and the subscription is created.
    # You should provision the subscription and save the customer ID to your database.
  when 'invoice.paid'
    # Continue to provision the subscription as payments continue to be made.
    # Store the status in your database and check when a user accesses your service.
    # This approach helps you avoid hitting rate limits.
  when 'invoice.payment_failed'
    # The payment failed or the customer does not have a valid payment method.
    # The subscription becomes past_due. Notify your customer and send them to the
    # customer portal to update their payment information.
  else
    puts "Unhandled event type: \#{event.type}"
  end

  status 200
end

# Set your secret key. Remember to switch to your live secret key in production.
# See your keys here: https://dashboard.stripe.com/apikeys
Stripe.api_key = 
'sk_test_4eC39HqLyjWDarjtT1zdp7dc'

# This is the URL to which users will be redirected after they are done
# managing their billing.
return_url = 
'{{DOMAIN_URL}}'
customer_id = 
'{{CUSTOMER_ID}}'

session = Stripe::BillingPortal::Session.create({
  customer: customer_id,
  return_url: return_url,
})

# Redirect to the URL for the session
#   redirect session.url, 303