unity chat system

void TaskOnClick()
    {
        // When the user clicks the Submit button,
        // create a JSON object from input field input
        JSONInformation publishMessage = new JSONInformation();
        publishMessage.username = string.Concat(UsernameInput.text, ": ");
        publishMessage.text = TextInput.text;
        string publishMessageToJSON = JsonUtility.ToJson(publishMessage);

        // Publish the JSON object to the assigned PubNub Channel
        pubnub.Publish()
            .Channel("chatchannel")
            .Message(publishMessageToJSON)
            .Async((result, status) =>
            {
                if (status.Error)
                {
                    Debug.Log(status.Error);
                    Debug.Log(status.ErrorData.Info);
                }
                else
                {
                    Debug.Log(string.Format(result.Timetoken));
                }
            });

        // Reset the text field to be blank
        TextInput.text = "";
    }