MYOB Essentials API endpoints
All available endpoints to consume for the MYOB Essentials API can be found in the navigation tree to the left. Some of these are grouped into collections i.e. GeneralLedger and Sale.
The first thing you are going to want to do after completing OAuth is call the Essentials base API URL to get a list of businesses for an authenticated user (provided you are also passing the right request headers).
There are two different URLs here depending on which region is consumed, Australia or New Zealand.