The Access Group uses an approved SSP (Sending Service Provider), that is SuperChoice, to send Single Touch Payroll (STP) information to the ATO. You don't need to supply a SSID to the ATO.
The following ATO link states that you can connect one of three ways, and the Access Group uses the second one, SSP (Sending Service Provider) - STP checklists | Australian Taxation Office (ato.gov.au)