# Adds pending invoice item interval parameter to create Checkout Sessions ## What’s new Adds the [pending_invoice_item_interval](https://docs.stripe.com/api/checkout/sessions/create.md?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data-pending_invoice_item_interval) parameter to the [create CheckoutSession](https://docs.stripe.com/api/checkout/sessions/create.md?api-version=2026-03-25.dahlia) endpoint. Use it to specify the billing frequency for [pending invoice items](https://docs.stripe.com/billing/invoices/subscription.md#Customize) when using [Checkout](https://docs.stripe.com/payments/checkout.md) with [subscriptions](https://docs.stripe.com/subscriptions.md). You can specify `day`, `week`, `month`, or `year`. ## Impact You can now configure the billing interval for pending invoice items when creating subscription-based payments in [Checkout Sessions](https://docs.stripe.com/api/checkout/sessions.md?api-version=2026-03-25.dahlia). That allows you to invoice pending items on a different schedule than the subscription cycle without needing to [update the Subscription](https://docs.stripe.com/api/subscriptions/update.md?api-version=2026-03-25.dahlia#update_subscription-pending_invoice_item_interval) after the Checkout Session completes. ## Changes #### REST API | Parameter | Change | Resources or endpoints | | ------------------------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------------------- | | `pending_invoice_item_interval` | Added | [Checkout.Session#create.subscription_data](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### Ruby | Parameter | Change | Resources or methods | | ------------------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------- | | `pending_invoice_item_interval` | Added | [Checkout::SessionCreateParams::SubscriptionDatum](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### Python | Parameter | Change | Resources or methods | | ------------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------ | | `pending_invoice_item_interval` | Added | [checkout.SessionCreateParamsSubscriptionDatum](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### PHP | Parameter | Change | Resources or methods | | ------------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `pending_invoice_item_interval` | Added | [Checkout\Session.create().$params.subscription_datum](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### Java | Parameter | Change | Resources or methods | | ---------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------- | | `pendingInvoiceItemInterval` | Added | [checkout.SessionCreateParams.subscription_data](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### Node.js | Parameter | Change | Resources or methods | | ------------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------- | | `pending_invoice_item_interval` | Added | [Checkout.SessionCreateParams.subscription_data](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### Go | Parameter | Change | Resources or methods | | ---------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------------- | | `PendingInvoiceItemInterval` | Added | [CheckoutSessionSubscriptionDataParams](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | #### .NET | Parameter | Change | Resources or methods | | ---------------------------- | ------ | ----------------------------------------------------------------------------------------------------------------------------------------------- | | `PendingInvoiceItemInterval` | Added | [CheckoutSessionSubscriptionDataOptions](/api/checkout/sessions/create?api-version=2026-03-25.dahlia#create_checkout_session-subscription_data) | ## 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: 2026-03-25.dahlia` 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 the latest version. 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 the latest version. 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 the latest version. 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 the latest version. 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 the latest version. 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 the latest version. 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 the latest version. 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 - [Updates Checkout Session UI mode enum values](https://docs.stripe.com/changelog/dahlia/2026-03-25/updates-available-checkout-session-ui-modes.md) - [Adds integration identifier parameter to Checkout Sessions](https://docs.stripe.com/changelog/dahlia/2026-03-25/adds-integration-identifier-parameter-to-checkout-sessions.md)