I am trying to verify my in-app purchase.
For that I have uploaded my binary and added In-app purchase.
But at iTunes it is showing me like following
Indeed, the In-App Purchases section appears after you get your In-App Purchase ready to be submitted and then upload a new build of your app. Here are some visuals to go along with this.
Get your first In-App Purchase ready for submission with all the details and screenshot, etc.
Upload a new version of your app (I change my version number but you might be able to just increment your build number).
Once that version is done processing, go to the iOS App section and scroll down. You should be able to see the In-App Purchases section now.
Click the + icon and select any/all of your In-App Purchases.
Once added, you can now submit your app version, along with the selected In-App Purchases, for review.