# Observer mode

Observer mode allows you to use Purchasely alongside your existing in-app subscription flow.

This is a great way to:

* Test Purchasely without changing your existing flow
* Receive the Server-to-server notifications to trigger your automations
* Connect our data with your marketing tools using our automations
* Analyse your business with our great charts
* and … smoothly migrate to Purchasely 🙂

### Configure the SDK

Please instantiate Purchasely as soon as the app starts so that we can grab the receipts presented on app launch (PSD2, ask-to-buy, …).

{% tabs %}
{% tab title="Swift" %}

```swift
import Purchasely

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
	Purchasely.start(withAPIKey: "API_KEY", appUserId: "USER_ID", observerMode: true)
	return true
}

```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
#import <Purchasely/Purchasely-Swift.h>

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
	// Override point for customization after application launch.

		[Purchasely startWithAPIKey:@"API_KEY"
					  appUserId:@"USER_ID"
				   observerMode:true
				  eventDelegate:nil
					 uiDelegate:nil
		 confirmPurchaseHandler:nil
					   logLevel: LogLevelInfo];

	return YES;
}
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
import io.purchasely.ext.Purchasely

Purchasely.Builder(applicationContext)
    .apiKey("API_KEY")
    .logLevel(LogLevel.DEBUG) // set to warning or error for release
    .userId("USER_ID")
    .eventListener(eventListener)
    .observerMode(true)
    .stores(listOf(GoogleStore(), HuaweiStore()))
    .build()

// When you are ready for Purchasely to initialize,
// you must call start() method that will grab configuration and products
// from the selected stores.
Purchasely.start()
```

{% endtab %}

{% tab title="Java" %}

```java
List<Store> stores = new ArrayList();
stores.add(new GoogleStore(), new HuaweiStore());

new Purchasely.Builder(getApplicationContext())
    .apiKey("API_KEY")
    .logLevel(LogLevel.DEBUG) // set to warning or error for release
    .userId("USER_ID")
    .eventListener(this)
    .observerMode(true)
    .stores(stores)
    .build();

// When you are ready for Purchasely to initialize,
// you must call start() method that will grab configuration and products
// from the selected stores.
Purchasely.start();
```

{% endtab %}

{% tab title="React Native" %}

```javascript
import Purchasely from 'react-native-purchasely';

Purchasely.startWithAPIKey(
  'API_KEY',
  ['Google'],
  'USER_ID',
  Purchasely.logLevelDebug,
  true
);

```

{% endtab %}

{% tab title="Cordova" %}

```javascript
Purchasely.startWithAPIKey('API_KEY', ['Google'], "USER_ID", Purchasely.LogLevel.ERROR, true);
```

{% endtab %}
{% endtabs %}

If your user change within your app life cycle, please update Purchasely like that:

{% tabs %}
{% tab title="Swift" %}

```swift
Purchasely.userLogin(with: "123456789")
```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
[Purchasely userLoginWith:@"123456789"];
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
Purchasely.userLogin("123456789") { refresh ->
    if (refresh) {
        //you can call your backend to refresh user information
    }
}
```

{% endtab %}

{% tab title="Java" %}

```java
Purchasely.userLogin("123456789", refresh -> {
    if(refresh) {
        //you can call your backend to refresh user information
    }
    return null;
});
```

{% endtab %}

{% tab title="React Native" %}

```javascript
Purchasely.userLogin('123456789').then((refresh) => {
  if (refresh) {
    //call your backend to refresh user information
  }
});
```

{% endtab %}

{% tab title="Cordova" %}

```javascript
Purchasely.userLogin("123456789");
```

{% endtab %}
{% endtabs %}

When a user logs out perform a:

{% tabs %}
{% tab title="Swift" %}

```swift
Purchasely.userLogout()
```

{% endtab %}

{% tab title="Objective-C" %}

```objectivec
[Purchasely userLogout];
```

{% endtab %}

{% tab title="Kotlin" %}

```kotlin
Purchasely.userLogout()
```

{% endtab %}

{% tab title="Java" %}

```java
Purchasely.userLogout();
```

{% endtab %}

{% tab title="React Native" %}

```javascript
Purchasely.userLogout();
```

{% endtab %}

{% tab title="Cordova" %}

```javascript
Purchasely.userLogout();
```

{% endtab %}
{% endtabs %}

{% hint style="danger" %}
Purchasely won't consume your purchases or acknowledge purchases made.

On **iOS** we won't finish the transaction of your consumables that will **remain in the queue** if you don't do that in your code.

On **Android** the transactions will be cancelled and **refunded after 3 days**.
{% endhint %}

### Sync your purchases (Android only)

When a purchase or a restoration is made with your current flow, call the `synchronize()` method of our SDK to send the receipt to our backend. This allow us to save the receipts on our server to prepare for your migration.

{% tabs %}
{% tab title="Kotlin" %}

```kotlin
Purchasely.synchronize()
```

{% endtab %}

{% tab title="Java" %}

```java
Purchasely.synchronize();
```

{% endtab %}

{% tab title="React Native" %}

```javascript
Purchasely.synchronize();
```

{% endtab %}

{% tab title="Cordova" %}

```javascript
Purchasely.synchronize();
```

{% endtab %}
{% endtabs %}