https://api.onegov.nsw.gov.au/certifier/v1/login

This call returns the bearer access token to be used in the authorisation header when submitting a building work.

https://api.onegov.nsw.gov.au/certifier/v1/certifiers/referencedata

This call returns all the reference data to be cross-referenced when creating the building work JSON object.

https://api.onegov.nsw.gov.au/certifier/v1/certifiers/submitwork

This call will submit and create a building work and related details for the user.