# Adds a documented reason for Klarna chargeback losses to Disputes API ## What’s new Adds the [chargeback_loss_reason_code](https://docs.stripe.com/api/disputes/object.md?api-version=2025-09-30.clover&rds=1&lang=curl#dispute_object-payment_method_details-klarna-chargeback_loss_reason_code) field, which provides a code describing the reason for lost chargeback disputes with Klarna. ## Impact The `chargeback_loss_reason_code` is included after Klarna closes a dispute. When handling disputes, use this information to identify factors that contributed to a loss. Understanding these reasons allows you to implement targeted strategies to reduce future chargeback losses. ## Changes #### REST API | Parameter | Change | Resources or endpoints | | ----------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------- | | `chargeback_loss_reason_code` | Added | [Dispute.payment_method_details.klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### Ruby | Parameter | Change | Resources or methods | | ----------------------------- | ------ | --------------------------------------------------------------------------------------------------------------------------------------- | | `chargeback_loss_reason_code` | Added | [Dispute::PaymentMethodDetail::Klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### Python | Parameter | Change | Resources or methods | | ----------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------- | | `chargeback_loss_reason_code` | Added | [Dispute.PaymentMethodDetail.Klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### PHP | Parameter | Change | Resources or methods | | ----------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------- | | `chargeback_loss_reason_code` | Added | [Dispute.payment_method_details.klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### Java | Parameter | Change | Resources or methods | | -------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------- | | `chargebackLossReasonCode` | Added | [Dispute.payment_method_details.klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### Node.js | Parameter | Change | Resources or methods | | ----------------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------- | | `chargeback_loss_reason_code` | Added | [Dispute.payment_method_details.klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### Go | Parameter | Change | Resources or methods | | -------------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------ | | `ChargebackLossReasonCode` | Added | [DisputePaymentMethodDetailsKlarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | #### .NET | Parameter | Change | Resources or methods | | -------------------------- | ------ | -------------------------------------------------------------------------------------------------------------------------------------- | | `ChargebackLossReasonCode` | Added | [Dispute.PaymentMethodDetails.Klarna](/api/disputes/object?api-version=2025-09-30.clover#dispute_object-payment_method_details-klarna) | ## 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: 2025-09-30.clover` 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 [v16.0.0](https://github.com/stripe/stripe-ruby/releases/tag/v16.0.0) 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 [v13.0.1](https://github.com/stripe/stripe-python/releases/tag/v13.0.1) 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 [v18.0.0](https://github.com/stripe/stripe-php/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). #### 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 [v30.0.0](https://github.com/stripe/stripe-java/releases/tag/v30.0.0) 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 [v19.1.0](https://github.com/stripe/stripe-node/releases/tag/v19.1.0) 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 [v83.0.0](https://github.com/stripe/stripe-go/releases/tag/v83.0.0) 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 [v49.0.0](https://github.com/stripe/stripe-dotnet/releases/tag/v49.0.0) 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 - [Changes the set of decline codes used for Alma, Amazon Pay, Billie, Satispay, and South Korean payment methods](https://docs.stripe.com/changelog/clover/2025-09-30/lpm-descriptive-decline-codes.md) - [Adds a processing status to submitted stablecoin payments](https://docs.stripe.com/changelog/clover/2025-09-30/stablecoin-payments-processing-status.md) - [Adds support for the MB WAY payment method](https://docs.stripe.com/changelog/clover/2025-09-30/mb-way-payments.md)