code: func NewPostMessageParameters() PostMessageParameters {
  	return PostMessageParameters{
  		Username:        DEFAULT_MESSAGE_USERNAME,
  		User:            DEFAULT_MESSAGE_USERNAME,
  		AsUser:          DEFAULT_MESSAGE_ASUSER,
  		Parse:           DEFAULT_MESSAGE_PARSE,
  		ThreadTimestamp: DEFAULT_MESSAGE_THREAD_TIMESTAMP,
  		LinkNames:       DEFAULT_MESSAGE_LINK_NAMES,
  		UnfurlLinks:     DEFAULT_MESSAGE_UNFURL_LINKS,
  		UnfurlMedia:     DEFAULT_MESSAGE_UNFURL_MEDIA,
  		IconURL:         DEFAULT_MESSAGE_ICON_URL,
  		IconEmoji:       DEFAULT_MESSAGE_ICON_EMOJI,
  		Markdown:        DEFAULT_MESSAGE_MARKDOWN,
  		EscapeText:      DEFAULT_MESSAGE_ESCAPE_TEXT,
  	}
  }
docs: // NewPostMessageParameters provides an instance of PostMessageParameters with all the sane default values set