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How to install App api version at App App level?

In the facebook developer toolbar, when I look at my application, I see things like:

This app is public and available to all users API Version: 2.4 App ID: ... App secret: ...

How to install API version 2.3? The field where 2.4 is displayed is disabled (grayed out), so I cannot edit it.

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You can not. v2.4 is the earliest version your application can invoke. The value depends on when the application was created and cannot be modified by you.

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You cannot set the API level to the minimum level, but you can (and should) install one of the available ones. This page contains an exhaustive explanation, including the most common case when you do not specify the version of the API (either in calls or in the SDK that you use):

What happens if I do not specify a version for the API?

We refer to this as an unversioned call. An unverified call will by default be the oldest version of the API. Consider this hypothetical API version life cycle:

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An unverified call will always point to the oldest version available at the top of the chart. This is currently v2.1, but after two years it will be v2.2, then v2.3, etc.

In this regard, our recommendation is to always indicate the version when making calls, where possible.

When using the JavaScript SDK for Facebook, you cannot make unbelieving API calls.

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