diff --git a/example/main/java/cn/jpush/api/examples/PushExample.java b/example/main/java/cn/jpush/api/examples/PushExample.java
index f452ccd9..a18dbb09 100644
--- a/example/main/java/cn/jpush/api/examples/PushExample.java
+++ b/example/main/java/cn/jpush/api/examples/PushExample.java
@@ -46,6 +46,8 @@ public class PushExample {
 
     public static void main(String[] args) {
 
+        // 回调参数可参考下面方法
+        testSendPushWithCustom();
         testSendPushWithCustomField();
 //        testBatchSend();
         testSendPushWithCustomConfig();
@@ -630,5 +632,51 @@ public static void testSendPushWithCustomField() {
         }
     }
 
+    /**
+     * 回调参数示例
+     */
+    public static void testSendPushWithCustom() {
+
+        ClientConfig config = ClientConfig.getInstance();
+        // Setup the custom hostname
+        config.setPushHostName("https://api.jpush.cn");
+
+        JPushClient jpushClient = new JPushClient(MASTER_SECRET, APP_KEY, null, config);
+
+        Notification notification = Notification.newBuilder()
+                .addPlatformNotification(AndroidNotification.newBuilder()
+                        .setAlert(ALERT)
+                        .setTitle("Alert test")
+                        .build())
+                .build();
+
+        JsonObject callback = new JsonObject();
+        callback.addProperty("url", "https://www.jiguagn.cn/callback");
+        JsonObject params = new JsonObject();
+        params.addProperty("name", "joe");
+        params.addProperty("age", 26);
+        callback.add("params", params);
+        callback.addProperty("type", 3);
+
+        PushPayload.Builder payloadBuilder = new PushPayload.Builder()
+                .setPlatform(Platform.all())
+                .setAudience(Audience.all())
+                .setNotification(notification)
+                .addCustom("callback", callback);
+
+        try {
+            PushResult result = jpushClient.sendPush(payloadBuilder.build());
+            LOG.info("Got result - " + result);
+        } catch (APIConnectionException e) {
+            LOG.error("Connection error. Should retry later. ", e);
+        } catch (APIRequestException e) {
+            LOG.error("Error response from JPush server. Should review and fix it. ", e);
+            LOG.info("HTTP Status: " + e.getStatus());
+            LOG.info("Error Code: " + e.getErrorCode());
+            LOG.info("Error Message: " + e.getErrorMessage());
+            LOG.info("Msg ID: " + e.getMsgId());
+        }
+    }
+
 }
 
diff --git a/pom.xml b/pom.xml
index ff26a476..463c9c25 100644
--- a/pom.xml
+++ b/pom.xml
@@ -3,7 +3,7 @@
 
 	<groupId>cn.jpush.api</groupId>
 	<artifactId>jpush-client</artifactId>
-	<version>3.4.3-SNAPSHOT</version>
+	<version>3.4.3</version>
 	<packaging>jar</packaging>
 	<url>https://github.com/jpush/jpush-api-java-client</url>
 	<name>JPush API Java Client</name>
diff --git a/src/main/java/cn/jpush/api/push/model/BatchPushResult.java b/src/main/java/cn/jpush/api/push/model/BatchPushResult.java
index da762cad..8a4777cd 100644
--- a/src/main/java/cn/jpush/api/push/model/BatchPushResult.java
+++ b/src/main/java/cn/jpush/api/push/model/BatchPushResult.java
@@ -12,11 +12,6 @@
 import java.util.List;
 import java.util.Map;
 
-/**
- * @author xudanxia
- * @Desc
- * @date 2019-08-22.
- */
 public class BatchPushResult extends BaseResult {
 
     private static final Type RESULT_TYPE = new TypeToken<Map<String, PushResult>>() {}.getType();
diff --git a/src/main/java/cn/jpush/api/push/model/PushPayload.java b/src/main/java/cn/jpush/api/push/model/PushPayload.java
index 4b48818b..575a38b0 100644
--- a/src/main/java/cn/jpush/api/push/model/PushPayload.java
+++ b/src/main/java/cn/jpush/api/push/model/PushPayload.java
@@ -14,6 +14,9 @@
 import cn.jpush.api.push.model.notification.Notification;
 import cn.jpush.api.push.model.notification.PlatformNotification;
 
+import java.util.LinkedHashMap;
+import java.util.Map;
+
 /**
  * The object you should build for sending a push.
  * 
@@ -54,9 +57,10 @@ public class PushPayload implements PushModel {
     private SMS sms;
     private String cid;
     private String target;
+    protected Map<String, JsonObject> custom;
     
     private PushPayload(Platform platform, Audience audience, 
-            Notification notification, Message message, Options options, SMS sms, String cid, String target) {
+            Notification notification, Message message, Options options, SMS sms, String cid, String target, Map<String, JsonObject> custom) {
         this.platform = platform;
         this.audience = audience;
         this.notification = notification;
@@ -65,6 +69,7 @@ private PushPayload(Platform platform, Audience audience,
         this.sms = sms;
         this.cid = cid;
         this.target = target;
+        this.custom = custom;
     }
 
     public PushPayload setCid(String cid) {
@@ -192,6 +197,11 @@ public JsonElement toJSON() {
         if (null != target) {
             json.addProperty(TARGET, target);
         }
+        if (null != custom) {
+            for (Map.Entry<String, JsonObject> entry : custom.entrySet()) {
+                json.add(entry.getKey(), entry.getValue());
+            }
+        }
                 
         return json;
     }
@@ -252,6 +262,11 @@ public static class Builder {
         private SMS sms = null;
         private String cid;
         private String target;
+        private Map<String, JsonObject> custom;
+
+        public Builder() {
+            this.custom = new LinkedHashMap<>();
+        }
 
         public Builder setTarget(String target) {
             this.target = target;
@@ -293,6 +308,11 @@ public Builder setCid(String cid) {
             return this;
         }
 
+        public Builder addCustom(String field, JsonObject jsonObject) {
+            this.custom.put(field, jsonObject);
+            return this;
+        }
+
         public PushPayload build() {
 
             if (StringUtils.isTrimedEmpty(target)) {
@@ -312,7 +332,7 @@ public PushPayload build() {
                 options = Options.sendno();
             }
             
-            return new PushPayload(platform, audience, notification, message, options, sms, cid, target);
+            return new PushPayload(platform, audience, notification, message, options, sms, cid, target, custom);
         }
     }
 }
diff --git a/src/main/java/cn/jpush/api/report/MessageDetailResult.java b/src/main/java/cn/jpush/api/report/MessageDetailResult.java
index f8065c18..df06f65e 100644
--- a/src/main/java/cn/jpush/api/report/MessageDetailResult.java
+++ b/src/main/java/cn/jpush/api/report/MessageDetailResult.java
@@ -11,11 +11,6 @@
 import java.util.ArrayList;
 import java.util.List;
 
-/**
- * @author xdx
- * @Desc
- * @date 2019-07-29.
- */
 public class MessageDetailResult extends BaseResult {
 
     private static final Type RECEIVED_TYPE = new TypeToken<List<MessageDetailResult.Received>>() {}.getType();