Iam previously using the v1 version of the dialogflow and then they announced that they are going to suspend it.I migrated my code in the cloud functions to the v2. But i co
You can integrate with Dialogflow API based library and a Java client API. The service account is used for creating credentials for Java client API. Need to click on the service account and get the JSON key generated from the IAM console. The client access token is used for integrating the Android client library Then create a cloud function fulfillment to handle the webhook request. Based on that, an appropriate response will be sent and can be integrated.
Another method is to use tools that offer integration into the Dialogflow. Just need to copy the client key into the dashboard and integrate or add Kommunicate iOS SDK to your app with CocoaPods dependency manager where the SDK comes with pre-configured Dialogflow integration. You'll be also able to customize the chat widget. Please check the following link for more information.