My app is already published, but I want to make it unavailable for a few moment, how can I do that? Thanks
How can I unpublish an app from the app store?
Go to iTunes Connect/My Apps/<appName>/App Store/Pricing and Availability...(•) Remove from sale.
Note that the change on/off/on won't be immediate. Don't expect it to take a few moments. Do -not- delete it.
Why do you need to do this?