Beta version release notes http://docs.whmcs.com/Version_5.2_Release_Notes mention one include file currently in use (dbconnect.php). Need to change this and make tests with beta version to see anything that might have changed besides that.
References to dbconnect.php now restricted to registrobrsync.php, which is only used in version 4.x.
Users with WHMCS 5.2 just need to use WHMCS own domainsync.php instead of registrobrsync.php
Beta version release notes http://docs.whmcs.com/Version_5.2_Release_Notes mention one include file currently in use (dbconnect.php). Need to change this and make tests with beta version to see anything that might have changed besides that.