card_block.json

{
  "type": "card",
  "block_id": "fake_block_id",
  "hero_image": {
    "type": "image",
    "image_url": "https://picsum.photos/400/300",
    "alt_text": "Sample hero image"
  },
  "title": {
    "type": "mrkdwn",
    "text": "Lumon Industries"
  },
  "subtitle": {
    "type": "mrkdwn",
    "text": "Committed to work-life balance"
  },
  "body": {
    "type": "mrkdwn",
    "text": "Please enjoy each card equally."
  },
  "actions": [
    {
      "type": "button",
      "text": {
        "type": "plain_text",
        "text": "Action Button"
      },
      "action_id": "button_action"
    }
  ],
  "slack_icon": {
    "type": "icon",
    "name": "bot"
  },
  "subtext": {
    "type": "mrkdwn",
    "text": "A card assembled by slackblocks."
  }
}