能否为Facebook列表消息模板设置背景及文本颜色？

Hey there! Let's tackle this question directly—since you've already checked the docs and come up empty, I can confirm what you're suspecting:

You cannot customize the background or text color for Facebook Messenger's List Template.

This template is a native component maintained by Meta, designed to enforce a consistent look and feel across all Messenger users and devices. For that reason, there are no API parameters (like color keys you could add to your payload) that let you tweak these styles. Any custom color-related fields you try to add to your existing payload will be ignored by the Messenger platform.

To confirm, here's your payload again—there's no spot here for color configurations, and none exist in the official spec:

{ 
  "title":"priority #2: and this is clickable title", 
  "subtitle":"And here’s some text, makes no sense, but I need it here", 
  "default_action": { 
    "type": "web_url", 
    "url": "http://google.com", 
    "messenger_extensions": false, 
    "webview_height_ratio": "tall" 
  } 
}

If custom styling is a must for your use case, your best workaround is to lean into the web_url action you're already using. Build a custom web page with exactly the background/text colors you want, then link to it via the webview. This gives you full control over the appearance, since you're rendering content outside the native Messenger template system. Another option is to use a Generic Template with a pre-styled image that includes your text, but that's less dynamic than a webview.

内容的提问来源于stack exchange，提问作者Mikołaj Kowal