$tokenFunctions array and return true (returning false makes no sense)
$tokenFunctions: array(action => callback)
+'ApiMain::onException': Called by ApiMain::executeActionWithErrorHandling()
+when an exception is thrown during API action execution.
+$apiMain: Calling ApiMain instance.
+$e: Exception object.
+
'ApiRsdServiceApis': Add or remove APIs from the RSD services list.
Each service should have its own entry in the $apis array and have a
unique name, passed as key for the array that represents the service data.