STP works by sending tax and super information from your STP-enabled payroll or accounting software to the ATO as you run your payroll. For more information on Single Touch Payroll click on the following ATO link What is STP?
Cashbook will connect to the ATO through a Sending Service Provider (SSP).
Practical Systems has chosen SuperChoice to be the SSP, and as such you do not need to contact the ATO to set up a connection. You will need to register your business details with SuperChoice before you can submit Single Touch Payroll reports.
This means you do not need an AUSKey to submit Single Touch Payroll information via Cashbook.
This will take you to the SuperChoice Portal
In the Employer ABN window:
Follow the prompts and enter all information required.
You will be asked to create a Username in the Summary - The final review window. This is unique to you and cannot be changed.