Enables the management of users and groups through the WebService API. Once installed, the following web service API methods are available:

pwg.groups.add
pwg.groups.addUser
pwg.groups.delete
pwg.groups.deleteUser
pwg.groups.getList
pwg.groups.rename

pwg.users.add
pwg.users.delete
pwg.users.getList
pwg.users.updateDetails

This plugin also includes the following methods (requires Icy Modify Picture plugin)

icy.acls.groups.addAlbum
icy.acls.groups.addUser
icy.acls.groups.deleteUser

More details on using the Piwigo API are here: http://piwigo.org/doc/doku.php?id=dev:webapi:start