# Initialization

Use initialize function to initialize AATKit. This operation should be run only once during the application lifecycle. You can pass JSON object as the parameter to set desired configuration. Please see the example below where AATKit is initialized with test mode using ID 74:

```typescript
AATKitIonic.initialize({
  testModeAccountId: 74, 
});
```

{% hint style="info" %}
Make sure to remove the `testModeAccountId` from your `configuration` object before you publish your app to the store. Otherwise, your app will not earn any ad revenue.
{% endhint %}