diff --git a/src/main/java/com/currencyfair/onesignal/model/player/AddEditDeviceRequestBuilder.java b/src/main/java/com/currencyfair/onesignal/model/player/AddEditDeviceRequestBuilder.java
index e5508cb..f2c3c7b 100644
--- a/src/main/java/com/currencyfair/onesignal/model/player/AddEditDeviceRequestBuilder.java
+++ b/src/main/java/com/currencyfair/onesignal/model/player/AddEditDeviceRequestBuilder.java
@@ -44,6 +44,7 @@ public final class AddEditDeviceRequestBuilder {
     private Long lastActive;
     private TestType testType;
     private Long playtime;
+    private String externalUserId;
 
     private AddEditDeviceRequestBuilder() {
     }
@@ -162,6 +163,11 @@ public AddEditDeviceRequestBuilder withPlaytime(Long playtime) {
         return this;
     }
 
+    public AddEditDeviceRequestBuilder withExternalUserId(String externalUserId) {
+        this.externalUserId = externalUserId;
+        return this;
+    }
+
     public AddEditDeviceRequest build() {
         AddEditDeviceRequest addEditDeviceRequest = new AddEditDeviceRequest();
         addEditDeviceRequest.setDeviceType(deviceType);
@@ -185,6 +191,7 @@ public AddEditDeviceRequest build() {
         addEditDeviceRequest.setLastActive(lastActive);
         addEditDeviceRequest.setTestType(testType);
         addEditDeviceRequest.setPlaytime(playtime);
+        addEditDeviceRequest.setExternalUserId(externalUserId);
         return addEditDeviceRequest;
     }
 }
diff --git a/src/main/java/com/currencyfair/onesignal/model/player/Device.java b/src/main/java/com/currencyfair/onesignal/model/player/Device.java
index 23addc9..92ac611 100644
--- a/src/main/java/com/currencyfair/onesignal/model/player/Device.java
+++ b/src/main/java/com/currencyfair/onesignal/model/player/Device.java
@@ -78,6 +78,9 @@ public class Device extends Session {
      */
     private Long playtime;
 
+    @JsonProperty("external_user_id")
+    private String externalUserId;
+
     public DeviceType getDeviceType() {
         return deviceType;
     }
@@ -150,6 +153,14 @@ public void setPlaytime(Long playtime) {
         this.playtime = playtime;
     }
 
+    public String getExternalUserId() {
+        return externalUserId;
+    }
+
+    public void setExternalUserId(String externalUserId) {
+        this.externalUserId = externalUserId;
+    }
+
     @Override
     public String toString() {
         return ToStringBuilder.reflectionToString(this);