My iPhone won't let me download in-apps?

I have a game on my iPhone, and I purchased coins for the game. It didn't give me the coins so I tried to to re-purchase it again and it said that I already purchased the item and I have to download it in in-apps. I enabled it under restrictions and it didn't work. I signed out of iTunes then re signed it. It won't work. Anyone know why?

Is there an update available?
Try restarting it?
Get better Wi-Fi connection?

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