diff --git a/src/main/com/sailthru/client/params/Send.java b/src/main/com/sailthru/client/params/Send.java
index cc218f4..b02df98 100644
--- a/src/main/com/sailthru/client/params/Send.java
+++ b/src/main/com/sailthru/client/params/Send.java
@@ -16,9 +16,11 @@ public class Send extends AbstractApiParams implements ApiParams {
     
     public static final String PARAM_SEND_ID = "send_id";
 
-    protected String send_id; 
+    protected String send_id;
     protected String template;
     protected String email;
+    protected SendKey key;
+    protected String id;
     protected Map<String, Object> vars;
     protected Object schedule_time;
     protected Map<String, Object> options;
@@ -38,6 +40,16 @@ public Send setEmail(String email) {
         return this;
     }
 
+    public Send setKey(SendKey key) {
+        this.key = key;
+        return this;
+    }
+
+    public Send setId(String id) {
+        this.id = id;
+        return this;
+    }
+
     public Send setTemplate(String template) {
         this.template = template;
         return this;
diff --git a/src/main/com/sailthru/client/params/SendKey.java b/src/main/com/sailthru/client/params/SendKey.java
new file mode 100644
index 0000000..de7a6d8
--- /dev/null
+++ b/src/main/com/sailthru/client/params/SendKey.java
@@ -0,0 +1,9 @@
+package com.sailthru.client.params;
+
+import com.google.gson.annotations.SerializedName;
+
+public enum SendKey {
+    @SerializedName("profile_id") PROFILE_ID,
+    @SerializedName("sid") SID,
+    @SerializedName("device_id") DEVICE_ID
+}
diff --git a/src/test/com/sailthru/client/params/SendTest.java b/src/test/com/sailthru/client/params/SendTest.java
index a30db60..cec5f11 100644
--- a/src/test/com/sailthru/client/params/SendTest.java
+++ b/src/test/com/sailthru/client/params/SendTest.java
@@ -205,6 +205,33 @@ public void testSetBehalfEmail(){
         assertEquals(expected, result);
     }
 
+    @Test
+    public void testSetKeyProfileId() {
+        send.setKey(SendKey.PROFILE_ID).setId("507f1f77bcf86cd799439011");
+
+        String expected = "{\"key\":\"profile_id\",\"id\":\"507f1f77bcf86cd799439011\",\"options\":{}}";
+        String result = gson.toJson(send);
+        assertEquals(expected, result);
+    }
+
+    @Test
+    public void testSetKeySid() {
+        send.setKey(SendKey.SID).setId("507f1f77bcf86cd799439011");
+
+        String expected = "{\"key\":\"sid\",\"id\":\"507f1f77bcf86cd799439011\",\"options\":{}}";
+        String result = gson.toJson(send);
+        assertEquals(expected, result);
+    }
+
+    @Test
+    public void testSetKeyDeviceId() {
+        send.setKey(SendKey.DEVICE_ID).setId("abc123devicetoken");
+
+        String expected = "{\"key\":\"device_id\",\"id\":\"abc123devicetoken\",\"options\":{}}";
+        String result = gson.toJson(send);
+        assertEquals(expected, result);
+    }
+
     @Test
     public void testSetOptions(){
         Map<String, Object> options = new HashMap<String, Object>();