You don't get coins for doing missions.
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There is no way to get 100000000 coins on Club Penguin.
you go to were you get the orders (epf comand room) and then to the tube transport,and click secret missins.
You have to play games to earn coins, although im not sure if club penguin will allow you that many coins.
you need to play games on club penguin to get more coins
codes from club penguin toys have a code on them to get club penguin coins. they men the spy quest