fix(api): improve order endpoint compatibility

src/client.rs

@@ -848,10 +848,14 @@ impl ClobClient {
 
         let response = req.json(&body).send().await?;
         if !response.status().is_success() {
-            return Err(PolyfillError::api(
-                response.status().as_u16(),
-                "Failed to post order",
-            ));
+            let status = response.status().as_u16();
+            let body = response.text().await.unwrap_or_default();
+            let message = if body.is_empty() {
+                "Failed to post order".to_string()
+            } else {
+                format!("Failed to post order: {}", body)
+            };
+            return Err(PolyfillError::api(status, message));
         }
 
         Ok(response.json::<Value>().await?)

src/types.rs

@@ -208,9 +208,10 @@ impl Side {
 }
 
 /// Order type specifications
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize, Default)]
 #[allow(clippy::upper_case_acronyms)]
 pub enum OrderType {
+    #[default]
     GTC,
     FOK,
     GTD,
@@ -1099,7 +1100,7 @@ pub struct OpenOrder {
     pub asset_id: String,
     #[serde(deserialize_with = "crate::decode::deserializers::number_from_string")]
     pub expiration: u64,
-    #[serde(rename = "type")]
+    #[serde(rename = "type", alias = "order_type", alias = "orderType", default)]
     pub order_type: OrderType,
     #[serde(deserialize_with = "crate::decode::deserializers::number_from_string")]
     pub created_at: u64,