After you have registered for your PaySync account, click on Settings.  You will now see a PaySync Authorisation Code.  Copy this code and paste it into the PaySync Settings in your Aussie Time Sheets software (Setup > General > Payroll Settings > select PaySync in drop-down):

Your Aussie Time Sheets software is now linked to PaySync.  You can now link and configure any available cloud payroll account within your PaySync account.

This solution is referencing the Aussie Time Sheets - PaySync Software, for more information please visit: