In the main project folder, which contains the ViewController.swift file, create a Swift class file called Constants.swift. Replace the class with the following code, adding in your values where applicable. Keep this file as a local file that only exists on your machine and be sure not to commit this file into source control, as it contains secrets that should not be made public. It is recommended that you do not keep secrets in your app. Instead, we recommend using a backend service to obtain the token, where the secrets can be kept outside of the app and off of the device. The backend API endpoint should be secured behind some form of authentication (for example, [OAuth](https://oauth.net/2/)) to prevent unauthorized users from obtaining tokens to use against your Immersive Reader service and billing; that work is beyond the scope of this tutorial.
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