You have to update your vaccination status directly via the 'Daily Checklist' in the driver app.
There is no other way to update your status. Please do not share your vaccination certificates with Sherpa via chat or email.
The definition of fully vaccinated differs between states and territories, as what is accepted as a valid exemption from being vaccinated. Please scroll down to your state and click the links for more info.
Exemption application form: https://www.servicesaustralia.gov.au/im011
How to update your status?