The SDK uses 2 delegates:

1. LPMessagingSDKDelegate - for lifecycle and connectivity events.

LPMessagingSDK.instance.delegate = self

1. LPMessagingSDKNotificationDelegate - for handling Push and In-App Notifications.

LPMessagingSDK.instance.registerPushNotifications(token: deviceToken, notificationDelegate: self)

You should implement and set the LPMessagingSDKNotificationDelegate, in order to receive Push Notifications from the SDK.