Android 在 Kotlin 客户端应用程序中发送 FCM 推送通知 Firebase 云消息传递

我试图找到一种方法向Kotlin内部的FCM发送请求，但我找不到任何解决方案.

我在Swift 就是这么做的:

func sendPushNotification(to token: String, title: String, subtitle: String, body: String, data: [String: String] = [:]) {
        let urlString = "https://fcm.googleapis.com/fcm/send"
        let url = NSURL(string: urlString)!
        let paramString: [String : Any] = [
            "to" : token,
                                           
            "notification" : [
                "title" : title,
                "subtitle": subtitle,
                "body" : body,
                "sound": "social_notification_sound.wav"
            ],
                                          
            "data" : data
        ]

        let request = NSMutableURLRequest(url: url as URL)
        request.httpMethod = "POST"
        request.httpBody = try? JSONSerialization.data(withJSONObject:paramString, options: [.prettyPrinted])
        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
        request.setValue("key={key}", forHTTPHeaderField: "Authorization")
        let task =  URLSession.shared.dataTask(with: request as URLRequest)  { (data, response, error) in
            do {
                if let jsonData = data {
                    if let jsonDataDict  = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions.allowFragments) as? [String: AnyObject] {
                        NSLog("Received data:\n\(jsonDataDict))")
                    }
                }
            } catch let err as NSError {
                print(err.debugDescription)
            }
        }
        task.resume()
    }

我对Kotlin 很陌生，所以我不知道该怎么做.我已经安装了"Retrofit"，但到目前为止，我还没有成功.我可以用FirebaseMessagingService()向我证明的token发送通知吗，title, subtitle, body & sound在Kotlin ？

如果是这样的话，这个函数会是什么样子？

提前谢谢你了.