appstore now need to add the restore button?

appstore now need to add the restore button?

appstore now need to add the restore button how to add?
Online to see
Weight change plus the Restore button called [[SKPaymentQueue defaultQueue] restoreCompletedTransacti *****];

What does it mean restoreCompletedTransacti ***** ~ ~

Where this is added to the? Please elaborate ~ ~ ~ ~ Thank you
Reply:
With seeking ah