My app uses FCM legacy API to send notifications. But those APIs were deprecated on June 20, 2023, and will be removed in June 2024. In FCM Legacy Api I have used the following code to send notifications

` private void sendPushNotification(String notificationTitle, String hisFcmToken, String notificationBody, String myUserID, String notificationPhotoUrl, String hisUserID) {

    try {
        JSONObject jsonObject = new JSONObject();

        JSONObject notificationObj = new JSONObject();
        notificationObj.put("title", notificationTitle);
        notificationObj.put("body", notificationBody);
        notificationObj.put("image", notificationPhotoUrl);
        notificationObj.put("priority", "high");

        JSONObject dataObj = new JSONObject();
        dataObj.put("isNewUncheckedLikeNotification", "true");
        dataObj.put("likerUserID", myUserID);

        jsonObject.put("notification", notificationObj);
        jsonObject.put("data", dataObj);
        jsonObject.put("to", hisFcmToken);


        callApi(jsonObject, hisUserID);

      


    } catch (Exception e) {

        Log.d("sendLikePushNotification", "Exception: " + e.getMessage());

    }


}

private void callApi(JSONObject jsonObject, String hisUserID) {
    MediaType JSON = MediaType.get("application/json; charset=utf-8");
    OkHttpClient client = new OkHttpClient();
    String url = "https://fcm.googleapis.com/fcm/send";
    RequestBody body = RequestBody.create(jsonObject.toString(), JSON);
    Request request = new Request.Builder().url(url).post(body).header("Authorization", "Bearer Authorization_key").build();
    client.newCall(request).enqueue(new Callback() {
        @Override
        public void onFailure(@NonNull Call call, @NonNull IOException e) {

        }

        @Override
        public void onResponse(@NonNull Call call, @NonNull Response response) throws IOException {

            if (response.isSuccessful()) {
                Log.d("PushNotification", "Notification successfully sent.");

            } else {
                Log.d("PushNotification", "Failed to send notification: " + response.code() + " " + response.message());
            }

        }
    });

}`

I have read this documentation but unable to understand clearly. I need an example code snippet or tutorial where the send notification is implemented completely. Thanks anyways.