code: function quickReply(payload, callback)
  {
    if (payload.quick_reply && typeof payload.quick_reply.payload == 'string')
    {
      // TODO: Make better parse and as a library
      payload.quick_reply.payload = JSON.parse(payload.quick_reply.payload);
    }
  
    callback(null, payload);
  }
docs: Parse quick reply payload
  Note: always expects postback payload to be JSON
  
  @this  Fbbot#
  @param {object} payload - messaging envelop object
  @param {function} callback - invoked after type casting is done