* Fix: Incorrect switch calculation when upgrading a synchronised product before the first renewal is due where the initial payment was prorated.
* Fix: When updating a subscription via the REST API, don't update the start date to the current time if the start date is not set in the request.
* Fix: When using the checkout block to pay for renewal orders, ensure the order's cart hash is updated to make sure the existing order can be used.
* Fix: Prevents a PHP fatal error that occurs when the...