Currently there's no documentation for the appmanagement API. The doc for this API should be added to these documentations:
https://developer.atlassian.com/display/CROWDDEV/Using+the+Crowd+REST+APIs
https://developer.atlassian.com/display/CROWDDEV/Crowd+REST+Resources

Example
List of all available methods under appmanagement or a call we can retrieve all available methods of this api;

Docs/tickets related
Add a remote address to an application: https://confluence.atlassian.com/display/CROWDKB/How+to+Add+a+Remote+Address+to+an+Application+Through+API
User aliasing
https://jira.atlassian.com/browse/CWD-1469