Fulfill orders with Checkout

Learn how to fulfill orders after a customer pays with Stripe Checkout or Stripe Payment Links.

After you integrate Stripe Checkout or create a Stripe Payment Link to take your customers to a payment form, you need notification that you can fulfill their order after they pay.

In this guide, you’ll learn how to:

Receive an event notification when a customer pays you.
Handle the event.
Use Stripe CLI to quickly test your new event handler.
Optionally, handle additional payment methods.
Turn on your event handler in production.

Install Stripe CLI

The quickest way to develop and test webhooks locally is with the Stripe CLI.

As a first step, follow the install guide for Stripe CLI.

After you finish the install guide, run the following command to test that your Stripe CLI installation works:

Command Line

stripe status

✔ All services are online.

If you see a success message after running stripe status, you’re ready to move on to the next step.

Create your event handler
Server-side

In this section, you’ll create a small event handler so Stripe can send you a checkout.session.completed event when a customer completes checkout.

First, create a new route for your event handler. Start by printing out the event you receive. You’ll verify that delivery is working in the next step:

# 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'

require 'sinatra'

post '/webhook' do
  payload = request.body.read

  # For now, you only need to print out the webhook payload so you can see
  # the structure.
  puts payload.inspect

  status 200
end

Testing

Run your server (for example, on localhost:4242). Next, set up Stripe CLI to forward events to your local server, so you can test your event handler locally:

Command Line

stripe listen --forward-to localhost:4242/webhook

Ready! Your webhook signing secret is 'whsec_<REDACTED>' (^C to quit)

Next, go through Checkout as a customer:

Click your checkout button (you probably set this up in the Accept a payment guide)
Fill out your payment form with test data
- Enter 4242 4242 4242 4242 as the card number
- Enter any future date for card expiry
- Enter any 3-digit number for CVV
- Enter any billing postal code (90210)
Click the Pay button

You should see:

A checkout.session.completed in the stripe listen output
A print statement from your server’s event logs with the checkout.session.completed event

Now that you’ve verified event delivery, you can add a bit of security to make sure that events are only coming from Stripe.

Verify events came from Stripe

Anyone can POST data to your event handler. Before processing an event, always verify that it came from Stripe before trusting it. The official Stripe library has built-in support for verifying webhook events, which you’ll update your event handler with:

# 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'

require 'sinatra'

# You can find your endpoint's secret in the output of the `stripe listen`
# command you ran earlier
endpoint_secret = 'whsec_...'

post '/webhook' do
  event = nil

  # Verify webhook signature and extract the event
  # See https://stripe.com/docs/webhooks/signatures for more information.
  begin
    sig_header = request.env['HTTP_STRIPE_SIGNATURE']
    payload = request.body.read
    event = Stripe::Webhook.construct_event(payload, sig_header, endpoint_secret)
  rescue JSON::ParserError => e
    # Invalid payload
    return status 400
  rescue Stripe::SignatureVerificationError => e
    # Invalid signature
    return status 400
  end

  # Print out the event so you can look at it
  puts event.inspect

  status 200
end

Testing

Go through the testing flow from the previous step. You should still see the checkout.session.completed event being printed out successfully.

Next, try hitting the endpoint with an unsigned request:

Command Line

curl -X POST \
  -H "Content-Type: application/json" \
  --data '{ "fake": "unsigned request" }' \
  -is http://localhost:4242/webhook


HTTP/1.1 400 Bad Request
... more headers

You should get a 400 Bad Request error, because you tried to send an unsigned request to your endpoint.

Now that the basics of the event handler are set up, you can move on to fulfilling the order.

Fulfill the order
Server-side

To fulfill the order, you’ll need to handle the checkout.session.completed event. Depending on which payment methods you accept (for example, cards, mobile wallets), you’ll also optionally handle a few extra events after this basic step.

Handle the `checkout.session.completed` event

Now that you have the basic structure and security in place to make sure any event you process came from Stripe, you can handle the checkout.session.completed event. This event includes the Checkout Session object, which contains details about your customer and their payment.

When handling this event, you might also consider:

Saving a copy of the order in your own database.
Sending the customer a receipt email.
Reconciling the line items and quantity purchased by the customer if using line_item.adjustable_quantity. If the Checkout Session has many line items you can paginate through them with the line_items.

Add code to your event handler to fulfill the order:

# 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'

require 'sinatra'

# You can find your endpoint's secret in the output of the `stripe listen`
# command you ran earlier
endpoint_secret = 'whsec_...'

post '/webhook' do
  event = nil

  # Verify webhook signature and extract the event
  # See https://stripe.com/docs/webhooks/signatures for more information.
  begin
    sig_header = request.env['HTTP_STRIPE_SIGNATURE']
    payload = request.body.read
    event = Stripe::Webhook.construct_event(payload, sig_header, endpoint_secret)
  rescue JSON::ParserError => e
    # Invalid payload
    return status 400
  rescue Stripe::SignatureVerificationError => e
    # Invalid signature
    return status 400
  end

  if event['type'] == 'checkout.session.completed'
    # Retrieve the session. If you require line items in the response, you may include them by expanding line_items.
    session = Stripe::Checkout::Session.retrieve({
      id: event['data']['object']['id'],
      expand: ['line_items'],
    })

    line_items = session.line_items
    fulfill_order(line_items)
  end

  status 200
end

def fulfill_order(line_items)
  # TODO: fill in with your own logic
  puts "Fulfilling order for #{line_items.inspect}"
end

Testing

Ensure that stripe listen is still running. Go through Checkout as a test user, just like in the prior steps. Your event handler should receive a checkout.session.completed event, and you should have successfully handled it.

Handle delayed notification payment methods
Server-side

This step is only required if you plan to use any of the following payment methods: Bacs Direct Debit, Bank transfers, Boleto, Canadian pre-authorized debits, Konbini, OXXO, SEPA Direct Debit, SOFORT, or ACH Direct Debit.

When receiving payments with a delayed notification payment method, funds aren’t immediately available. It can take multiple days for funds to process so you should delay order fulfillment until the funds are available in your account. After the payment succeeds, the underlying PaymentIntent status changes from processing to succeeded.

You’ll need to handle the following Checkout events:

Event Name	Description	Next steps
checkout.session.completed	The customer has successfully authorized the debit payment by submitting the Checkout form.	Wait for the payment to succeed or fail.
checkout.session.async_payment_succeeded	The customer’s payment succeeded.	Fulfill the purchased goods or services.
checkout.session.async_payment_failed	The payment was declined, or failed for some other reason.	Contact the customer via email and request that they place a new order.

These events all include the Checkout Session object.

Update your event handler to fulfill the order:

# 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'

# You can find your endpoint's secret in the output of the `stripe listen`
# command you ran earlier
endpoint_secret = 'whsec_...'

post '/webhook' do
  event = nil

  # Verify webhook signature and extract the event
  # See https://stripe.com/docs/webhooks/signatures for more information.
  begin
    sig_header = request.env['HTTP_STRIPE_SIGNATURE']
    payload = request.body.read
    event = Stripe::Webhook.construct_event(payload, sig_header, endpoint_secret)
  rescue JSON::ParserError => e
    # Invalid payload
    return status 400
  rescue Stripe::SignatureVerificationError => e
    # Invalid signature
    return status 400
  end

  case event['type']
  if event['type'] == 'checkout.session.completed'
    checkout_session = event['data']['object']

    fulfill_order(checkout_session)
  end
  when 'checkout.session.completed'
    checkout_session = event['data']['object']

    # Save an order in your database, marked as 'awaiting payment'
    create_order(checkout_session)

    # Check if the order is already paid (for example, from a card payment)
    #
    # A delayed notification payment will have an `unpaid` status, as
    # you're still waiting for funds to be transferred from the customer's
    # account.
    if checkout_session.payment_status == 'paid'
      fulfill_order(checkout_session)
    end
  when 'checkout.session.async_payment_succeeded'
    checkout_session = event['data']['object']

    # Fulfill the purchase...
    fulfill_order(checkout_session)
  when 'checkout.session.async_payment_failed'
    session = event['data']['object']

    # Send an email to the customer asking them to retry their order
    email_customer_about_failed_payment(checkout_session)
  end

  status 200
end

def fulfill_order(checkout_session)
  # TODO: fill in with your own logic
  puts "Fulfilling order for #{checkout_session.inspect}"
end

def create_order(checkout_session)
  # TODO: fill in with your own logic
  puts "Creating order for #{checkout_session.inspect}"
end

def email_customer_about_failed_payment(checkout_session)
  # TODO: fill in with your own logic
  puts "Emailing customer about payment failure for: #{checkout_session.inspect}"
end

Testing

Ensure that stripe listen is still running. Go through Checkout as a test user, like you did in the prior steps. Your event handler should receive a checkout.session.completed event, and you should have successfully handled it.

Now that you’ve completed these steps, you’re ready to go live in production whenever you decide to do so.

Go live in production

After you’ve deployed your event handler endpoint to production, you need to register your live URL with Stripe. Follow this quick guide to set that up.

Fulfill orders with Checkout

Install Stripe CLI

Create your event handlerServer-side

Testing

Verify events came from Stripe

Testing

Fulfill the orderServer-side

Handle the checkout.session.completed event

Testing

Handle delayed notification payment methodsServer-side

Testing

Go live in production

Create your event handler
Server-side

Fulfill the order
Server-side

Handle the `checkout.session.completed` event

Handle delayed notification payment methods
Server-side