diff --git a/src/ws/sub_structs.rs b/src/ws/sub_structs.rs
index 4c3c94e5..ac414647 100644
--- a/src/ws/sub_structs.rs
+++ b/src/ws/sub_structs.rs
@@ -112,7 +112,7 @@ pub struct CandleData {
     pub volume: String,
 }
 
-#[derive(Deserialize, Clone, Debug)]
+#[derive(Deserialize, Clone, Debug, PartialEq, Eq)]
 #[serde(rename_all = "camelCase")]
 pub struct OrderUpdate {
     pub order: BasicOrder,
@@ -120,7 +120,7 @@ pub struct OrderUpdate {
     pub status_timestamp: u64,
 }
 
-#[derive(Deserialize, Clone, Debug)]
+#[derive(Deserialize, Clone, Debug, PartialEq, Eq)]
 #[serde(rename_all = "camelCase")]
 pub struct BasicOrder {
     pub coin: String,
@@ -129,7 +129,21 @@ pub struct BasicOrder {
     pub sz: String,
     pub oid: u64,
     pub timestamp: u64,
+    #[serde(default)]
+    pub trigger_condition: String,
+    #[serde(default)]
+    pub is_trigger: bool,
+    #[serde(default)]
+    pub trigger_px: String,
+    #[serde(default)]
+    pub is_position_tpsl: bool,
+    #[serde(default)]
+    pub reduce_only: bool,
+    #[serde(default)]
+    pub order_type: String,
     pub orig_sz: String,
+    #[serde(default)]
+    pub tif: Option<String>,
     pub cloid: Option<String>,
 }
 
@@ -351,3 +365,87 @@ pub struct BboData {
     pub time: u64,
     pub bbo: Vec<Option<BookLevel>>,
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn deserializes_limit_order_update() {
+        let json = r#"{
+            "order": {
+                "coin": "BTC",
+                "side": "B",
+                "limitPx": "90000.0",
+                "sz": "0.001",
+                "oid": 123,
+                "timestamp": 1700000000000,
+                "origSz": "0.001",
+                "cloid": null,
+                "triggerCondition": "N/A",
+                "isTrigger": false,
+                "triggerPx": "0.0",
+                "isPositionTpsl": false,
+                "reduceOnly": false,
+                "orderType": "Limit",
+                "tif": "Gtc"
+            },
+            "status": "open",
+            "statusTimestamp": 1700000000000
+        }"#;
+
+        let update: OrderUpdate = serde_json::from_str(json).unwrap();
+        assert!(!update.order.is_trigger);
+        assert_eq!(update.order.trigger_condition, "N/A");
+        assert_eq!(update.order.trigger_px, "0.0");
+        assert_eq!(update.order.tif.as_deref(), Some("Gtc"));
+        assert!(!update.order.reduce_only);
+        assert_eq!(update.order.order_type, "Limit");
+    }
+
+    #[test]
+    fn deserializes_stop_market_order() {
+        let json = r#"{
+            "coin": "BTC",
+            "side": "A",
+            "limitPx": "101856.0",
+            "sz": "0.001",
+            "oid": 456,
+            "timestamp": 1700000000000,
+            "origSz": "0.001",
+            "triggerCondition": "Price below 101856.0",
+            "isTrigger": true,
+            "triggerPx": "101856.0",
+            "isPositionTpsl": false,
+            "reduceOnly": true,
+            "orderType": "Stop Market",
+            "tif": null
+        }"#;
+
+        let order: BasicOrder = serde_json::from_str(json).unwrap();
+        assert!(order.is_trigger);
+        assert_eq!(order.trigger_px, "101856.0");
+        assert!(order.trigger_condition.contains("Price below"));
+        assert!(order.reduce_only);
+        assert_eq!(order.order_type, "Stop Market");
+        assert_eq!(order.tif, None);
+    }
+
+    #[test]
+    fn deserializes_legacy_order_without_trigger_fields() {
+        let json = r#"{
+            "coin": "ETH",
+            "side": "B",
+            "limitPx": "3000.0",
+            "sz": "1.0",
+            "oid": 789,
+            "timestamp": 1700000000000,
+            "origSz": "1.0"
+        }"#;
+
+        let order: BasicOrder = serde_json::from_str(json).unwrap();
+        assert!(!order.is_trigger);
+        assert_eq!(order.trigger_px, "");
+        assert_eq!(order.tif, None);
+    }
+}