A business can also send message to his customer with Twirll Messenger to do so, goto
Manage Orders ⇒ Order Detail ⇒ Message
Fig. 1
You can see message button on top right of Order history(Fig. 2) click on it and you will be redirected to Twirll Messenger and your previous conversation with the customer will be opened up(Fig. 3)
Fig. 2
Fig. 3
You can send text to customer updating about order or any other detail that he must know.