To receive a message, your Plivo Application must have a
message_url. Plivo expects an XML response from this URL after it sends the parameters below. Only a
Message XML element can be sent as a response from the message URL. See the Message XML reference page for more information.
The source number of the message.
The number to which the message was sent.
The type of the message.
Allowed value: sms
The message content.
A unique ID for the message.