Hi all,
Version 7.8 has now reached public beta, which includes this feature: https://preview.whmcs.com
No actions are needed in order to leverage the new functionality, but it is important as always to ensure you update custom checkout and order form templates to ensure compatibility: https://docs.whmcs.com/Version_7.8.0_Release_Notes#Template_Changes
Please join us during the pre-release testing period and provide your feedback in our dedicated beta community board: https://whmcs.community/forum/471-v78-beta-discussion/