In App Purchase - restoring auto-renewing subscriptions

I’m adding the ability to restore subscriptions to our app.

I can successfully verify the receipt(s) using RMStore. Now, I’m at a roadblock.

We only offer 1 paid product, which is an auto-renewing subscription.

So, my question is: should I offer the user a UIALERT with a message about “Would you like to restore your subscription to this new device?” and OK/CANCEL buttons?

Or should I render a tableview, with 1 cell?

Or, a custom VC and skip the tableview?

Our app, is universal, so I’m leaning towards the UIALERT so I can use the same code between iPhone and iPad.