Where can I get my application secret besides facebook developers?

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Not an easy answer but here it goes. When you submit an app. since you developed it then you can also include a user id and password access to it.
My suggestion is for you to add those in your app. while in development and don't forget to add a session because its a good way to secure the app. from simple hacks.
When it is ready then release a newer version without the session or login.