Version 6.3.1 Release Notes
MODULE-6384 GlobalsignSSL Module has new API endpoints - Globalsign has introduced a new API for purchasing SSL certificates. WHMCS now supports their new API version. It's highly recommended that you upgrade to this latest version of WHMCS if you depend on the GlobalsignSSL module before they fully deprecate the older API.
ADDON-5985 Provide Project Manager reports unencoded - The Project Manager addon reports, like other reports for WHMCS, are provided unencoded to aid and guide developers wishing to author their own reports.
CORE-9899 Clear support ticket note draft storage on successful submission - Ensure that saved notes are cleared from the browser's internal storage on submission, otherwise subsequent notes will start autofilled with the previous note.