The DSS website landing page with this information is at:
https://www.dss.gov.au/grants/programme-reporting/the-dss-data-exchange-technical-specifications
These documents provide technical details about the data format and system requirements, and are primarily aimed at IT managers, system developers and software providers.

Web Services (system to system transfer):
https://www.dss.gov.au/sites/default/files/documents/08_2015/web_services_technical_specification_version_1.2.pdf
The specification for web services covers the following:
Interface details – technical infrastructure, interface messages, security, authentication and errors
Interface data – data formats and commonly used data terms
Interface examples
Interface availability
Detailed specifications

Bulk Upload:
https://www.dss.gov.au/sites/default/files/documents/08_2015/bulk_file_upload_technical_specifications_version_1.2.pdf
The specification for bulk upload covers the following:
Interface details – technical infrastructure, security and authentication
Reference data
Bulk Upload XML File – data formats, commonly used data terms, examples
Error processing
A pre-production environment will be available to developers for testing in early November 2014. For enquiries, how to access the pre-production environment and technical support please email link sends e-mail (link sends e-mail)