New features have been added to the Xsolla changelog including: switching subscription plans during current billing cycle & in-game balance on the user's page.
Switching to another subscription plan in the current billing cycle
Now a user can switch to another subscription plan in the current billing cycle directly from their PayStation User Account. In this case, all remaining service time is proportionally converted into a subscription balance.
The subscription balance may fully or partially cover the costs for the new plan. If the balance is not enough to cover the amount due, the user should pay the difference to complete changing their subscription plan. If no additional payments are required, the operation will be performed immediately.
After changing the plan, the balance can be used to renew the current subscription.
To enable this option, please contact your project’s account manager.