Update app.py

app.py

@@ -148,15 +148,45 @@ def read_approved_list(file) -> List[str]:
         st.error(f"Failed to parse approved list: {e}")
         return []
 
+# 🔹 FIX START: robust normalization + exact matching
+def normalize_payload(payload: str) -> str:
+    if not payload:
+        return ""
+    p = payload.strip().lower()
+
+    if p.startswith("upi://"):
+        try:
+            from urllib.parse import urlparse, parse_qs
+            parsed = urlparse(p)
+            qs = parse_qs(parsed.query)
+            if "pa" in qs:
+                return qs["pa"][0].strip().lower()
+        except Exception:
+            pass
+
+    if "pa=" in p:
+        try:
+            part = p.split("pa=")[1].split("&")[0]
+            return part.strip().lower()
+        except Exception:
+            pass
+
+    for prefix in ["upi://", "http://", "https://"]:
+        if p.startswith(prefix):
+            p = p[len(prefix):]
+
+    return p
+
 def match_payload(payload: str, approved: List[str]) -> bool:
     if not payload:
         return False
-    p = payload.strip().lower()
+    norm_payload = normalize_payload(payload)
     for a in approved:
-        a_norm = a.strip().lower()
-        if a_norm in p or p in a_norm:
+        norm_a = normalize_payload(a)
+        if norm_payload == norm_a:
             return True
     return False
+# 🔹 FIX END
 
 st.set_page_config(page_title="QR Code Anomaly Scanner", layout="wide")
 st.title("🕵️ QR Code Anomaly Scanner (Retail Store 360° CCTV Frames)")