WooCommerce Sagepay Form Gateway Version 4.7.15 Changelog
* Fix for Protocol 4 subscription renewals “StatusDetail=3373 : The ThreeDSExemptionIndicator field is missing”
* Extend checks column to subscription renewals if renewed using Protocol 4.00
* Make sure _sage_result is not updated in subscription parent order by renewal order
* Copy token to renewal orders if available
* Make sure existing token is stored in subscription order in Protocol 4
* Prevent refreshing/back button from sending PARes twice maybe.