code: protected function renderV2()
      {
          if ('google' == $this->requestSource) {
              $out = [
                  'platform'        => 'ACTIONS_ON_GOOGLE',
                  'simpleResponses' => [
                      'simpleResponses' => [],
                  ],
              ];
  
              if ($this->ssml) {
                  $out['simpleResponses']['simpleResponses'][0]['ssml'] = $this->ssml;
              } else {
                  $out['simpleResponses']['simpleResponses'][0]['textToSpeech'] = $this->text;
              }
  
              $out['simpleResponses']['simpleResponses'][0]['displayText'] = $this->text;
  
              return $out;
          } else {
              $out = [
                  'text' => [
                      'text' => [$this->text],
                  ],
              ];
  
              if (in_array($this->requestSource, $this->supportedRichMessagePlatforms)) {
                  $out['platform'] = $this->v2PlatformMap[$this->requestSource];
              }
  
              return $out;
          }
      }
docs: Render response as array for API V2.
  
  @return array