{
    "type": "object",
    "properties": {
        "success": {
            "type": "boolean",
            "description": "Whether the scheduled message was cancelled successfully"
        },
        "message": {
            "type": "string",
            "description": "Success or error message"
        },
        "cancelledMessageId": {
            "type": "string",
            "description": "ID of the cancelled message"
        },
        "originalScheduledDate": {
            "type": "string",
            "format": "date-time",
            "description": "Original scheduled send date"
        },
        "cancelledAt": {
            "type": "string",
            "format": "date-time",
            "description": "Timestamp when the message was cancelled"
        },
        "messageDetails": {
            "type": "object",
            "properties": {
                "id": {
                    "type": "string",
                    "description": "Message ID"
                },
                "type": {
                    "type": "string",
                    "enum": ["SMS", "Email", "WhatsApp"],
                    "description": "Type of cancelled message"
                },
                "status": {
                    "type": "string",
                    "enum": ["cancelled"],
                    "description": "Updated status after cancellation"
                },
                "subject": {
                    "type": "string",
                    "description": "Message subject (for emails)"
                },
                "body": {
                    "type": "string",
                    "description": "Message content"
                }
            },
            "description": "Details of the cancelled message"
        }
    },
    "version": 1
}