> ## Documentation Index
> Fetch the complete documentation index at: https://docs.shipmobilefast.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Overview of OAuth authentication

## I think that is going to be tricky...

### Apple is easy, Google hard.

#### Thats because of the Google's OAuth SHA1 fingerprint.

<CardGroup>
  <Card title="Apple" icon="apple" href="/auth/oauth/ios">
    Please click here for Apple.
  </Card>

  <Card title="Google" icon="google" href="/auth/oauth/android">
    Please click here for Google.
  </Card>
</CardGroup>

## Important

After you set up the OAuth, you need to create a new build.

<Tabs>
  <Tab title="EAS">
    ```bash theme={null}
    eas build --profile development --platform ios
    ```
  </Tab>

  <Tab title="Without EAS">
    <Tab title="iOS">
      ```bash theme={null}
      npx expo prebuild
      npx expo run:ios
      ```
    </Tab>

    <Tab title="Android">
      ```bash theme={null}
      npx expo prebuild
      npx expo run:android
      ```
    </Tab>
  </Tab>
</Tabs>