# Adds optional items to Checkout Sessions and Payment Links

## What’s new

Adds support to Checkout and Payment Links for offering optional items that customers can add to their orders during checkout.

## Impact

The optional items feature lets you offer complementary products to your customers during checkout. You can configure these items using the [optional_items](https://docs.stripe.com/api/checkout/sessions/create.md?api-version=2025-03-31.basil#create_checkout_session-optional-items) parameter in the Checkout Sessions and Payment Links APIs.

## Changes

#### REST API

| Parameter        | Change | Resources or endpoints                                                                                                                                                                                     |
| ---------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `optional_items` | Added  | [Checkout.Session#create](/api/checkout/sessions/create?api-version=2025-03-31.basil), [Checkout.Session](/api/checkout/sessions/object?api-version=2025-03-31.basil), `PaymentLink#create`, `PaymentLink` |

#### Ruby

This change does not affect the Ruby SDK.

#### Python

| Parameter        | Change | Resources or methods                                                                          |
| ---------------- | ------ | --------------------------------------------------------------------------------------------- |
| `optional_items` | Added  | `CheckoutSession`, `PaymentLink.CreateParams`, `PaymentLink`, `checkout.Session.CreateParams` |

#### PHP

| Parameter        | Change | Resources or methods                                                                          |
| ---------------- | ------ | --------------------------------------------------------------------------------------------- |
| `optional_items` | Added  | [Checkout.Session](/api/checkout/sessions/object?api-version=2025-03-31.basil), `PaymentLink` |

#### Java

| Parameter       | Change | Resources or methods                                                                                                                                                                                                 |
| --------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `optionalItems` | Added  | [Checkout.Session](/api/checkout/sessions/object?api-version=2025-03-31.basil), `PaymentLinkCreateParams`, `PaymentLink`, [checkout.SessionCreateParams](/api/checkout/sessions/create?api-version=2025-03-31.basil) |

#### Node.js

| Parameter        | Change | Resources or methods                                                                                                                                                                                                 |
| ---------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `optional_items` | Added  | [Checkout.SessionCreateParams](/api/checkout/sessions/create?api-version=2025-03-31.basil), [Checkout.Session](/api/checkout/sessions/object?api-version=2025-03-31.basil), `PaymentLinkCreateParams`, `PaymentLink` |

#### Go

| Parameter       | Change | Resources or methods                                                                                                                                                                                                                                          |
| --------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `OptionalItems` | Added  | [CheckoutSessionParams](/api/checkout/sessions/object?api-version=2025-03-31.basil), [CheckoutSession](/api/checkout/sessions/object?api-version=2025-03-31.basil), [PaymentLinkParams](/api/payment-link/object?api-version=2025-03-31.basil), `PaymentLink` |

#### .NET

| Parameter       | Change | Resources or methods                                                                                                                                                                                                  |
| --------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `OptionalItems` | Added  | [Checkout.SessionCreateOptions](/api/checkout/sessions/create?api-version=2025-03-31.basil), [CheckoutSession](/api/checkout/sessions/object?api-version=2025-03-31.basil), `PaymentLinkCreateOptions`, `PaymentLink` |

## Upgrade

#### REST API

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. If you use an SDK, upgrade to the corresponding SDK version for this API version.
   - If you don’t use an SDK, update your [API requests](https://docs.stripe.com/api/versioning.md) to include `Stripe-Version: 2025-03-31.basil`
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### Ruby

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your Ruby SDK to [v15.0.0](https://github.com/stripe/stripe-ruby/releases/tag/v15.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### Python

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your Python SDK to [v12.0.0](https://github.com/stripe/stripe-python/releases/tag/v12.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### PHP

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your PHP SDK to [v17.0.0](https://github.com/stripe/stripe-php/releases/tag/v17.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### Java

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your Java SDK to [v29.0.0](https://github.com/stripe/stripe-java/releases/tag/v29.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### Node.js

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your Node SDK to [v18.0.0](https://github.com/stripe/stripe-node/releases/tag/v18.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### Go

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your Go SDK to [v82.0.0](https://github.com/stripe/stripe-go/releases/tag/v82.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

#### .NET

1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench.
1. Upgrade your .NET SDK to [v48.0.0](https://github.com/stripe/stripe-dotnet/releases/tag/v48.0.0)
1. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md).
1. [Test your integration](https://docs.stripe.com/testing.md) against the new version.
1. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md).
1. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours.

Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md).

## Related changes

- [Checkout Session removes shipping details](https://docs.stripe.com/changelog/basil/2025-03-31/checkout-session-remove-shipping-details.md)
- [Checkout Sessions have lower latency and new update semantics](https://docs.stripe.com/changelog/basil/2025-03-31/checkout-legacy-subscription-upgrade.md)
- [Checkout Session allows shipping option updates](https://docs.stripe.com/changelog/basil/2025-03-31/checkout-session-shipping-options-update-param.md)
- [Adds permissions parameter to Checkout Sessions](https://docs.stripe.com/changelog/basil/2025-03-31/cs_add_checkout_session_permissions.md)