Public Apps are Lnk.Bio Apps that can be used by any Lnk.Bio user.You create a Public App if you want to offer a service to your existing users, integrate your app with Lnk.Bio, and in general when you need to access/create data on behalf of other Lnk.Bio users.
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A Public App requires a Review from the Lnk.Bio team before it can actually access users data.
Until it has passed the Review, a Public App can only access the Lnk.Bio account that created the App.The Authorization flow is the typical 3-legged oAuth 2 flow. If you're not familiar with this flow, check out this great explanation from the LinkedIn team.