Okay, it's pretty simple, Facebook will notify you when it's approved. We have outlined some information below that you can view, also you need to take not of this. Facebook will be "testing" your application with a real user profile, meaning a real human will test it. Please make sure you've followed the instructions, it's important to not have breakage in your "Flow" otherwise you'll get ----> " NOT APPROVED". Which is easy to fix, but we aim for 100% first time approval.
Image Shows Approved Application
Image Shows Facebook Note
