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Prerequisites

Before you begin, make sure you have set up your Privy app and obtained your app ID and client ID from the Privy Dashboard.
A properly set up app client is required for mobile apps and other non-web platforms to allow your app to interact with the Privy API. Please follow this guide to configure an app client by following this guide here.

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Initializing Privy

First, import the Privy package at the top of your file: 
import 'package:privy_flutter/privy_flutter.dart';
Initialize a Privy instance with a PrivyConfig object: 
final privyConfig = PrivyConfig(
  appId: "YOUR_APP_ID",
  appClientId: "YOUR_CLIENT_ID",
  logLevel: PrivyLogLevel.verbose,
);

final privy = Privy(config: privyConfig);

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Configuration

The configuration fields for the PrivyConfig are:
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appId
String
required
Your Privy application ID, which can be obtained from the Privy Developer Dashboard, under App Settings > Basics
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appClientId
String
required
Your app client ID, which can be obtained from the Privy Developer Dashboard, under App Settings > Clients
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logLevel
PrivyLogLevel
(Optional) Your preferred log level. If no log level is specified, it will default to PrivyLogLevel.NONE.
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customAuthConfig
LoginWithCustomAuthConfig
(Optional) Only use this if you plan to use custom authentication. Find more information here.
Be sure to maintain a single instance of Privy across the lifetime of your application. Initializing multiple instances of Privy will result in unexpected errors.

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Waiting for Privy to be ready

When the Privy SDK is initialized, the user’s authentication state will be set to NotReady until Privy finishes initialization. This might include checking if the user has a wallet connected, refreshing expired auth tokens, fetching up-to-date user data, and more. It’s important to wait until Privy has finished initializing before you consume Privy’s state and interfaces, to ensure that the state you consume is accurate and not stale. For your convenience, we’ve added an async awaitReady() function that you can use to wait for Privy to finish initializing: 
Future<void> checkPrivyAuth() async {
  // Show loading state
  setState(() => isLoading = true);

  // Wait for Privy SDK to be ready
  await privy.awaitReady();

  // Check if user is authenticated
  bool isAuthenticated = privy.currentAuthState.isAuthenticated;

  // Update UI based on authentication state
  setState(() {
    isLoading = false;
    isUserAuthenticated = isAuthenticated;
  });
}

// Example usage in a widget
@override
Widget build(BuildContext context) {
  return isLoading
    ? LoadingScreen()
    : (isUserAuthenticated ? AppScreen() : LoginScreen());
}