If you use the Facebook Instant Games platform when building your project, this package automatically downloads and initializes the Facebook Instant Games SDK when the build runs in the Facebook environment.
To do so, add <script src="https://connect.facebook.net/en_US/fbinstant.7.1.js"></script> to the index.html file and call FBInstant.InitializeAsync, followed by FBInstant.StartGameAsync in your Unity code, awaiting the completion of each call before proceeding:
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