fix(refund_list): updated refund list response status code when no refunds found. (#974)

Co-authored-by: hrithikesh vm <hrithikesh.vm@hrithikesh.vm-MacBookPro>

crates/api_models/src/refunds.rs

@@ -146,7 +146,9 @@ pub struct RefundListRequest {
 
 #[derive(Debug, Clone, Eq, PartialEq, Deserialize, Serialize, ToSchema)]
 pub struct RefundListResponse {
-    /// The list of refund response
+    /// The number of refunds included in the list
+    pub size: usize,
+    /// The List of refund response object
     pub data: Vec<RefundResponse>,
 }