It is possible to give and receive apps as gifts through email. The sender pays for the app.
The email comes with a link that automatically takes you to the App Store and downloads the gifted app. You have to tap and choose to open the link, and you can interrupt it anytime before it starts the actual download.
@Ronedgar2; If the app says is it Waiting or you have a download bar you can try tapping on it to pause. Once paused it may be possible to delete it the normal way. Tap and hold until it jiggles, then tap the x to delete.
A restart may also help, then try the above it the app starts to download again.
If that does not work you may have to wait for the app to finish installing before you can delete it.
Or I've completely misunderstood what you are talking about, in which case please add some more details.