Improved billing attempt error handling for subscriptions in Selling Plan API

Following the release of subscription billing attempt respecting merchant’s inventory policy to prevent overselling, we added new features to assist developers in managing billing errors.

As of 2025-01, when accessing billing error details during billing attempts, you can now leverage processingError to identify specific product variants responsible for inventory errors. This update provides better insight into failed billing attempts related to inventory issues by integrating location-specific inventory data directly within the error diagnostics.

Learn more about the Selling Plan API inventory policy.