Version: 3.1.2
* Fix: Issue when failed renewal orders count for discount upgrade
* Fix: Issue when sale price counted as based price whenever discounts proceeds
* Fix: Solved problem with inappropriate "+/-" signs on user account level
* Fix: Error on user-account level (for non-discounted subscriptions)
* Fix: Disabling discount's fields for non-discount subscriptions
* Fix: 0100% discount on user account bug
* Fix: Next renewal cost adjusted on initial payment (cart and checkout)
* Fix: Critical error when unable to calculate the discount
* Minor improvements on wp-admin side and user account