* Add: Compatibility with WooCommerce's new preview email feature introduced in 9.6.
* Fix: Prevents PHP fatal error when wcs_can_user_renew_early() is called with a non-existent subscription ID.
* Fix: Prevent payment gateways that complete Change Payment requests asynchronously from blocking future attempts to update payment methods for all subscriptions.
* Fix: Resolved an issue that could lead to undefined variable when attempting to send a customer notification email with no order.
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