Are used to set and get a list of permissions for app items (ApplicationItem) and the app (Application) itself. For example, getting a list of permissions for an app would look like this:

const app = await Application.getPermissions();

Give the user permissions to create:

const user = Context.data.__createdBy;
const permissions = new Permissions([new PermissionValue(user,  [PermissionType.CREATE])]); 
await Application.setPermissions(permissions);  

Check whether the user has permissions to create:

const user = Context.data.__createdBy;
await Application.hasPermission(user,  PermissionType['CREATE']); 

На элемент приложения нельзя выставить право на создание PermissionValue.Create