# Modify trial subscriptions created by Payment Links

## What’s new

Updates the [subscription_data.trial_period_days](https://docs.stripe.com/api/payment-link/create.md?api-version=2024-12-18.acacia#create_payment_link-subscription_data-trial_period_days) parameter so that it adjusts the number of free trial days for subscriptions created by that Payment Link.

## Impact

You can now modify the length of free trial days for subscriptions created by a Payment Link. This change affects only subscriptions created after updating this value, leaving existing subscriptions unchanged.

## Changes

#### REST API

| Parameter           | Change | Resources or endpoints                                                                         |
| ------------------- | ------ | ---------------------------------------------------------------------------------------------- |
| `trial_period_days` | Added  | [PaymentLink#update.subscription_data](/api/payment-link/update?api-version=2024-12-18.acacia) |

#### Ruby

This change does not affect the Ruby SDK.

#### Python

| Parameter           | Change | Resources or methods                                                                                      |
| ------------------- | ------ | --------------------------------------------------------------------------------------------------------- |
| `trial_period_days` | Added  | [stripe.PaymentLink.ModifyParamsSubscriptionData](/api/payment-link/update?api-version=2024-12-18.acacia) |

#### PHP

This change does not affect the PHP SDK.

#### Java

| Parameter           | Change | Resources or methods                                                                                |
| ------------------- | ------ | --------------------------------------------------------------------------------------------------- |
| `trial_period_days` | Added  | [PaymentLinkUpdateParams.subscription_data](/api/payment-link/update?api-version=2024-12-18.acacia) |

#### Node.js

| Parameter           | Change | Resources or methods                                                                                |
| ------------------- | ------ | --------------------------------------------------------------------------------------------------- |
| `trial_period_days` | Added  | [PaymentLinkUpdateParams.subscription_data](/api/payment-link/update?api-version=2024-12-18.acacia) |

#### Go

| Parameter         | Change | Resources or methods                                                                        |
| ----------------- | ------ | ------------------------------------------------------------------------------------------- |
| `TrialPeriodDays` | Added  | [PaymentLinkSubscriptionDataParams](/api/payment-link/update?api-version=2024-12-18.acacia) |

#### .NET

| Parameter         | Change | Resources or methods                                                                         |
| ----------------- | ------ | -------------------------------------------------------------------------------------------- |
| `TrialPeriodDays` | Added  | [PaymentLinkSubscriptionDataOptions](/api/payment-link/update?api-version=2024-12-18.acacia) |

## 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: 2024-12-18.acacia`
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 [v13.3.0](https://github.com/stripe/stripe-ruby/releases/tag/v13.3.0)
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 [v11.4.0](https://github.com/stripe/stripe-python/releases/tag/v11.4.0)
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 [v16.4.0](https://github.com/stripe/stripe-php/releases/tag/v16.4.0)
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 [v28.2.0](https://github.com/stripe/stripe-java/releases/tag/v28.2.0)
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 [v17.5.0](https://github.com/stripe/stripe-node/releases/tag/v17.5.0)
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 [v81.2.0](https://github.com/stripe/stripe-go/releases/tag/v81.2.0)
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 [v47.2.0](https://github.com/stripe/stripe-dotnet/releases/tag/v47.2.0)
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

- [Adds support for reinstating Billing Credits on Invoice voiding](https://docs.stripe.com/changelog/acacia/2024-12-18/billing-credits-invoice-voiding.md)
- [Billing Portal Configuration always returns period end date in responses](https://docs.stripe.com/changelog/acacia/2024-12-18/portal-config-schedule-at-period-end-required.md)