Peach Payments is committed to supporting our merchants who use our various API versions. However new enhancements are only developed for the latest version.
We will continue to support previous versions of COPYandPAY and maintain bug fixes.
The version-specific documentation will continue to be available.
Correspondingly, we don't mandate that our merchants upgrade: If a merchant is integrated, there is no need to do anything except if you wish to avail of the new features.
Don't hesitate to contact us for support should this be the case.