Oh trust me I know plenty about how iOS works. I regularly use developer tools to monitor the system console error log, have worked for successful iOS App developers, and solved problems/bugs that even the best technicians couldn't solve.
Regardless, I've never seen/experienced this "Pending purchase" scenario you describe. Either the purchase succeeds, or fails, any time I've ever made a purchase. If there's any issue with the payment or if I click Cancel, the purchase cancels. It only succeeds if I approve and my payment processes.
Under what circumstances does it result in this pending state, and can you please elaborate on it more precisely? I asked you to reboot and you didn't even acknowledge that suggestion, much less try it.
Finally, even though you're being insulting and ungrateful, I'll show mercy and advise you that you can always use Report a Problem to request a Refund for any purchase you didn't receive. I didn't see anyone else offering substantial help to you. Next time don't kick a gift horse in the mouth if you want people to *volunteer* to help you in their free time...