func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    Purchases.logLevel = .debug
    Purchases.configure(withAPIKey: <public_apple_api_key>, appUserID: <app_user_id>)

}

import Purchases

@main
struct SampleApp: App {
    init() {
        Purchases.logLevel = .debug
        Purchases.configure(withAPIKey: <public_apple_api_key>, appUserID: <app_user_id>)
    }

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  	// Override point for customization after application launch.
    
  	RCPurchases.logLevel = RCLogLevelDebug;
        [RCPurchases configureWithAPIKey:<public_apple_api_key> appUserID:<app_user_id>];
    
  	return YES;
}

// If you're targeting only Google Play Store
class MainApplication: Application() {
    override fun onCreate() {
        super.onCreate()
        Purchases.debugLogsEnabled = true
        Purchases.configure(PurchasesConfiguration.Builder(this, <public_google_api_key>).build())
    }
}

// If you're building for the Amazon Appstore, you can use flavors to determine which keys to use
// In your build.gradle:
flavorDimensions "store"
productFlavors {
    amazon {
        buildConfigField "String", "STORE", "\"amazon\""
    }

    google {
        buildConfigField "String", "STORE", "\"google\""
    }       
}

///...

class MainApplication: Application() {
    override fun onCreate() {
        super.onCreate()
        Purchases.debugLogsEnabled = true
          
        if (BuildConfig.STORE.equals("amazon")) {
        	Purchases.configure(AmazonConfiguration.Builder(this, <public_amazon_api_key>).build())
        } else if (BuildConfig.STORE.equals("google")) {
        	Purchases.configure(PurchasesConfiguration.Builder(this, <public_google_api_key>).build())
        }
    }
}

// If you're targeting only Google Play Store
public class MainApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Purchases.setDebugLogsEnabled(true);
        Purchases.configure(new PurchasesConfiguration.Builder(this, <public_google_api_key>).build());
    }
}

// If you're building for the Amazon Appstore, 
// click the Kotlin tab to see how to set up flavors in your build.gradle:
///...

public class MainApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        Purchases.setDebugLogsEnabled(true);
      
        PurchasesConfiguration.Builder builder = null;
      
        if (BuildConfig.STORE.equals("amazon")) {
            builder = new AmazonConfiguration.Builder(this, "public_amazon_sdk_key");
        } else if (BuildConfig.STORE.equals("google")) {
            builder = new PurchasesConfiguration.Builder(this, "public_google_sdk_key");
        }
      
        Purchases.configure(builder.build());
    }
}

import 'dart:io' show Platform;

//...

Future<void> initPlatformState() async {
  await Purchases.setDebugLogsEnabled(true);
  
  PurchasesConfiguration configuration;
  if (Platform.isAndroid) {
    configuration = PurchasesConfiguration(<public_google_api_key>);
    if (buildingForAmazon) { 
      // use your preferred way to determine if this build is for Amazon store
      // checkout our MagicWeather sample for a suggestion
      configuration = AmazonConfiguration(<public_amazon_api_key>);
    }
  } else if (Platform.isIOS) {
    configuration = PurchasesConfiguration(<public_apple_api_key>);
  }
  await Purchases.configure(configuration);
}

import { Platform } from 'react-native';

//...

export default class App extends React.Component {

  componentDidMount() {
    Purchases.setLogLevel(Purchases.LOG_LEVEL.DEBUG);

    if (Platform.OS === 'ios') {
    	await Purchases.configure({ apiKey: <public_apple_api_key> });
    } else if (Platform.OS === 'android') {
    	await Purchases.configure({ apiKey: <public_google_api_key> });

      // OR: if building for Amazon, be sure to follow the installation instructions then:
    	await Purchases.configure({ apiKey: <public_amazon_api_key>, useAmazon: true });
    }

  }
}

document.addEventListener("deviceready", onDeviceReady, false);

function onDeviceReady() {
    Purchases.setDebugLogsEnabled(true);
    if (window.cordova.platformId === 'ios') {
        Purchases.configureWith({ apiKey: <public_apple_api_key> });
    } else if (window.cordova.platformId === 'android') {
        Purchases.configureWith({ apiKey: <public_google_api_key> });
    }
    // OR: if building for Amazon, be sure to follow the installation instructions then:
    Purchases.configureWith({ apiKey: <public_amazon_api_key>, useAmazon: true });
}

const onDeviceReady = async () => {
    await Purchases.setLogLevel(LOG_LEVEL.DEBUG);
    if (Capacitor.getPlatform() === 'ios') {
        await Purchases.configure({ apiKey: <public_apple_api_key> });
    } else if (Capacitor.getPlatform() === 'android') {
        await Purchases.configure({ apiKey: <public_google_api_key> });
    }
    // OR: if building for Amazon, be sure to follow the installation instructions then:
    await Purchases.configure({ apiKey: <public_amazon_api_key>, useAmazon: true });
}

// The SDK can be configured through the Unity Editor.
// See Unity installation instructions https://docs.revenuecat.com/docs/unity

// If you'd like to configure the SDK programmatically, 
// make sure to check "Use runtime setup" in the Unity Editor, and then:

Purchases.PurchasesConfiguration.Builder builder = Purchases.PurchasesConfiguration.Builder.Init(<public_api_key>);
Purchases.PurchasesConfiguration purchasesConfiguration =
    .SetAppUserId(<app_user_id>)
    .Build();
purchases.Configure(purchasesConfiguration);