public ChannelMessageCallback withPushNotification(PushNotificationConfiguration pushNotification) {
        setPushNotification(pushNotification);
        return this;
    }
<p>
The push notification configuration of the message.
</p>

@param pushNotification
       The push notification configuration of the message.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-chimesdkmessaging/src/main/java/com/amazonaws/services/chimesdkmessaging/model/ChannelMessageCallback.java