core/homeassistant/components/persistent_notification/services.yaml

create:
  description: Show a notification in the frontend.
  fields:
    message:
      description: Message body of the notification. [Templates accepted]
      example: Please check your configuration.yaml.
    title:
      description: Optional title for your notification. [Optional, Templates accepted]
      example: Test notification
    notification_id:
      description: Target ID of the notification, will replace a notification with the same ID. [Optional]
      example: 1234

dismiss:
  description: Remove a notification from the frontend.
  fields:
    notification_id:
      description: Target ID of the notification, which should be removed. [Required]
      example: 1234

mark_read:
  description: Mark a notification read.
  fields:
    notification_id:
      description: Target ID of the notification, which should be mark read. [Required]
      example: 1234