{
  "$schema": "https://json-structure.org/draft/2020-12/schema",
  "name": "MessagePayload",
  "type": "object",
  "properties": {
    "html": {
      "type": "string"
    },
    "text": {
      "type": "string"
    },
    "subject": {
      "type": "string"
    },
    "from_email": {
      "type": "string"
    },
    "from_name": {
      "type": "string"
    },
    "to": {
      "type": "array"
    },
    "headers": {
      "type": "object"
    },
    "important": {
      "type": "boolean"
    },
    "track_opens": {
      "type": "boolean"
    },
    "track_clicks": {
      "type": "boolean"
    },
    "auto_text": {
      "type": "boolean"
    },
    "auto_html": {
      "type": "boolean"
    },
    "inline_css": {
      "type": "boolean"
    },
    "url_strip_qs": {
      "type": "boolean"
    },
    "preserve_recipients": {
      "type": "boolean"
    },
    "view_content_link": {
      "type": "boolean"
    },
    "bcc_address": {
      "type": "string"
    },
    "tracking_domain": {
      "type": "string"
    },
    "signing_domain": {
      "type": "string"
    },
    "return_path_domain": {
      "type": "string"
    },
    "merge": {
      "type": "boolean"
    },
    "merge_language": {
      "type": "string"
    },
    "global_merge_vars": {
      "type": "array"
    },
    "merge_vars": {
      "type": "array"
    },
    "tags": {
      "type": "array"
    },
    "subaccount": {
      "type": "string"
    },
    "google_analytics_domains": {
      "type": "array"
    },
    "google_analytics_campaign": {
      "type": "string"
    },
    "metadata": {
      "type": "object"
    },
    "recipient_metadata": {
      "type": "array"
    },
    "attachments": {
      "type": "array"
    },
    "images": {
      "type": "array"
    }
  }
}