diff --git a/README.md b/README.md
index f6496b8..5fe787d 100644
--- a/README.md
+++ b/README.md
@@ -97,3 +97,17 @@ curl -X POST http://localhost:5000/verify-payment \
   "success": false
 }
 ```
+2. If session times out
+```json
+{
+  "message": "Error from tx.sh: Session Expired",
+  "success": false
+}
+```
+3. If 500 from server
+```json
+{
+    "message": "Internal server error"
+    "success": false,
+}
+```