Using Notifications on iOS for development using SUP 2.0

Hello Experts ,

I am developong an iPad application using SUP 2.0 .

I want to know how to use Notifications to get appropriate replies from the server .

Tried an example in infocenter but not of that use .

Where should i use notifications .

Say for Eg :- I am fetching data from Backend for a particular PO and in the mean while when the data is being fetched i want to show Notifications for onImportSuccess , onReplaySuccess

Few more examples would be of great Help .

Thanks & Regards ,

Rockky .