What is the difference between User Authentication, Team Authentication and App Authentication ? which is the most efficient one ?
See the following page from the API documentation.
(I'm moving your thread to the API forum in case you need further assistance.)
The link Rich shared covers the differences between the different authentication types. Please refer to that for more information and let us know if you have any questions.
Note that no authentication type is really any more "efficient" than another. They just serve different purposes. You can see whichauthentication type each endpoint supports in the documentation.
I would like to know whether we can access all the objects that are specified in user authentication and team authenticationby by app authentication for eg. folder items, team groups, team list, etc.