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Make line item quantities adjustable

Learn how to allow your customers to adjust the quantity of items during checkout.

The line items for each Checkout Session keep track of what your customer is purchasing. You can configure the Checkout Session so customers can adjust line item quantities during checkout.

Payment Intents API

If you use the Payment Intents API, you must manually track line item updates and modify the payment amount, or by creating a new PaymentIntent with adjusted amounts.

Enable adjustable quantities
Server-side

Remarque

Other line item updates, such as adding new line items, aren’t supported for this integration.

Set adjustable_quantity on your line_items when creating a Checkout Session to allow your customers to update the quantity of an item during checkout.

Command Line
cURL
Stripe CLI
Ruby
Python
PHP
Java
Node.js
Go
.NET
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curl https://api.stripe.com/v1/checkout/sessions \
  -u "
sk_test_BQokikJOvBiI2HlWgH4olfQ2
:" \
  -d "line_items[0][price_data][currency]"=usd \
  -d "line_items[0][price_data][product_data][name]"=T-shirt \
  -d "line_items[0][price_data][unit_amount]"=2000 \
  -d "line_items[0][quantity]"=1 \
  -d "line_items[0][adjustable_quantity][enabled]"=true \
  -d "line_items[0][adjustable_quantity][maximum]"=100 \
  -d "line_items[0][adjustable_quantity][minimum]"=0 \
  -d mode=payment \
  -d ui_mode=custom \
  -d return_url={{RETURN_URL}}

You can customize the default settings for the minimum and maximum quantities allowed by setting adjustable_quantity.minimum and adjustable_quantity.maximum. By default, an item’s minimum adjustable quantity is 0 and the maximum adjustable quantity is 99. You can specify a value of up to 999999 for adjustable_quantity.maximum.

Checkout prevents the customer from removing an item if it’s the only item remaining.

Update line item quantities
Client-side

Use updateLineItemQuantity to change a line item’s quantity in response to customer interaction, such as a button to increment the quantity. Pass the line item ID and the new quantity:

index.html
<button class="increment-quantity-button" data-line-item="{{line item ID}}">+</button>
checkout.js
stripe.initCheckout({fetchClientSecret}).then((checkout) => {
  const button = document.querySelector('.increment-quantity-button');
  const lineItem = button.getAttribute("data-line-item");
  const quantity = checkout.session().lineItems.find((li) => li.id === lineItem).quantity;
  button.addEventListener('click', () => {
    checkout.updateLineItemQuantity({
      lineItem,
      quantity: quantity + 1,
    })
  })
});

Handle completed transactions
Server-side

After the payment completes, you can make a request for the finalized line items and their quantities. If your customer removes a line item, it is also removed from the line items response. See the Fulfillment guide to learn how to create an event handler to handle completed Checkout Sessions.

Remarque

To test your event handler, install the Stripe CLI and use stripe listen --forward-to localhost:4242/webhook to forward events to your local server.

Ruby
Python
PHP
Java
Node.js
Go
.NET
No results
# 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_BQokikJOvBiI2HlWgH4olfQ2"


require 'sinatra'

# You can find your endpoint's secret in your webhook settings
endpoint_secret = 'whsec_...'

post '/webhook' do
  event = nil

  # Verify webhook signature and extract the event
  # See https://stripe.com/docs/webhooks#verify-events 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'
    checkout_session = event['data']['object']

    line_items = Stripe::Checkout::Session.list_line_items(checkout_session['id'], {limit: 100})

    # Fulfill the purchase...
    begin
      fulfill_order(checkout_session, line_items)
    rescue NotImplementedError => e
      return status 400
    end
  end

  status 200
end

def fulfill_order(checkout_session, line_items)
  # TODO: Remove error and implement...
  raise NotImplementedError.new(<<~MSG)
    Given the Checkout Session "#{checkout_session.id}" load your internal order from the database here.
    Then you can reconcile your order's quantities with the final line item quantity purchased. You can use `checkout_session.metadata` and `price.metadata` to store and later reference your internal order and item ids.
  MSG
end
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