Answer
Lightning Payroll desktop can connect with the ATO's machine credential renewal service. This allows you to easily renew machine credentials used for sending Single Touch Payroll through to the ATO.
You can renew your credentials under Tools >> Renew Machine Credential. All you need to do is select the credential you wish to renew and click Attempt Renewal. Renewals are not guaranteed since it is outside of our control. You may need to create a new machine credential if a problem arises or if you have forgotten your ATO keystore password.
To find out how to create a new machine credential, click here.
To find out what to do if you have forgotten your machine credential keystore password, click here.