docs: def sendMessage(self, to, message, extra={}):
          """
          If the 'to' parameter is a single entry, we will parse it into a list.
          We will merge default values into the request data and the extra parameters
          provided by the user.
          """
          to = to if isinstance(to, list) else [to]
          to = [str(num) for num in to]
          data = {'to': to, 'text': message}
          data = self.merge(data, {'callback': 7, 'mo': 1}, extra)
  
          content = self.parseRest(self.request('rest/message', data, {}, 'POST'));
          result = []
  
          # Messages in the REST response will contain errors on the message entry itself.
          for entry in content['message']:
              entry = self.merge({'apiMessageId': False, 'to': data['to'][0], 'error': False, 'errorCode': False}, entry)
              result.append({
                  'id': entry['apiMessageId'].encode('utf-8'),
                  'destination': entry['to'].encode('utf-8'),
                  'error': entry['error']['description'].encode('utf-8') if entry['error'] != False else False,
                  'errorCode': entry['error']['code'].encode('utf-8') if entry['error'] != False else False
              });
  
          return result