diff --git a/block.py b/block.py
index 4e05406..37e508a 100644
--- a/block.py
+++ b/block.py
@@ -14,6 +14,7 @@ def __main__(
         hd_score_s1: float,
         hd_score_s2: float,
         hd_score_s3: float,
+        hd_score_iso_m2: float
     ) -> dict:
 
     data = {
@@ -22,6 +23,7 @@ def __main__(
         "hd_score_s1": hd_score_s1,
         "hd_score_s2": hd_score_s2,
         "hd_score_s3": hd_score_s3,
+        "hd_score_iso_m2": hd_score_iso_m2,
     }
 
     final = processing(data)
diff --git a/request_schema.json b/request_schema.json
index f39d447..8cfaab5 100644
--- a/request_schema.json
+++ b/request_schema.json
@@ -21,6 +21,10 @@
     "hd_score_s3": {
       "type": ["number", "null"],
       "description": "HD Fraud Score S3"
+    },
+    "hd_score_iso_m2": {
+      "type": ["number", "null"],
+      "description": "HD Fraud Score M2"
     }
   },
   "required": []
diff --git a/score_processing.py b/score_processing.py
index 8d48c36..3d3d0eb 100644
--- a/score_processing.py
+++ b/score_processing.py
@@ -10,61 +10,101 @@ logger = logging.getLogger(__name__)
 
 def processing(data: dict) -> dict:
     score_threshold = 1200
+    score_threshold2 = 1225
 
-    # Compute FINAL_score based on conditions
+    # ---- Compute hd_score1, hd_score2, final hd_score ----
     try:
-        for key in ["hd_score_s1", "hd_score_s2", "hd_score_g1", "hd_score_s3"]:
-            if key in data and data[key] > score_threshold:
-                hd_score = data[key]
-                break
-        else:
-            hd_score = data.get("hd_score_m1", None)  # Default if no conditions are met
+        hd_score1 = max([
+            data["hd_score_s1"],
+            data["hd_score_s2"],
+            data["hd_score_g1"],
+            data["hd_score_s3"],
+            data["hd_score_m1"],
+        ])
+
+        hd_score2 = data["hd_score_iso_m2"]
+
+        if hd_score1 > score_threshold:
+            hd_score = hd_score1
+        elif hd_score2 >= score_threshold2:
+            hd_score = hd_score2
+        else:
+            hd_score = max(hd_score1, hd_score2)
+
+        # logging.info(f"Computed hd_score1={hd_score1}, hd_score2={hd_score2}, final hd_score={hd_score}")
 
-        logging.info(f"hd_score calculated: {hd_score}")
     except Exception as e:
-        logging.error(f"Error processing hd_score calculations: {e}")
+        logging.error(f"Error calculating hd_score values: {e}")
         return {}
 
-
-    # Compute recommended_action
+    # ---- recommended_action ----
     try:
-        recommended_action = "Decline Application" if hd_score > score_threshold else "Pass Application"
+        if hd_score1 > score_threshold or hd_score2 >= score_threshold2:
+            recommended_action = "Decline Application"
+        else:
+            recommended_action = "Pass Application"
+
         logging.info(f"recommended_action: {recommended_action}")
+
     except Exception as e:
         logging.error(f"Error assigning recommended_action: {e}")
         return {}
 
-    # Compute description
+    # ---- description ----
     try:
-        description = (
-            f"HD Fraud Score is above the risk threshold {score_threshold}, Recommended action: Decline Application"
-            if hd_score > score_threshold
-            else f"HD Fraud Score is below the risk threshold {score_threshold}, Recommended action: Pass Application"
-        )
+        if hd_score1 > score_threshold:
+            description = (
+                f"HD Fraud Score is above the risk threshold {score_threshold}, "
+                f"Recommended action: Decline Application"
+            )
+        elif hd_score2 >= score_threshold2:
+            description = (
+                f"HD Fraud Score is above the risk threshold {score_threshold2}, "
+                f"Recommended action: Decline Application"
+            )
+        else:
+            description = (
+                "HD Fraud Score is below the risk threshold, Recommended action: Pass Application"
+            )
+
         logging.info(f"description: {description}")
+
     except Exception as e:
-        logging.error(f"Error assigning description: {e}")
+        logging.error(f"Error creating description: {e}")
         return {}
 
-    # Compute action_reasoncode
+    # ---- hd_action_reasoncode ----
     try:
-        action_reason_mapping = {
-            "hd_score_s1": "S1 Triggered",
-            "hd_score_s2": "S2 Triggered",
-            "hd_score_g1": "G1 Triggered",
-            "hd_score_s3": "S3 Triggered",
-            "hd_score_m1": "M1 Triggered",
-        }
+        reason_hierarchy = [
+            ("hd_score_s1", "S1 Triggered"),
+            ("hd_score_s2", "S2 Triggered"),
+            ("hd_score_g1", "G1 Triggered"),
+            ("hd_score_s3", "S3 Triggered"),
+            ("hd_score_m1", "M1 Triggered"),
+            ("hd_score_iso_m2", "M2 Triggered"),  # NEW
+        ]
+
+        hd_action_reasoncode = "Pass"
+
+        for key, reason in reason_hierarchy:
+            score = data[key]
+
+            if key == "hd_score_iso_m2":
+                if score >= score_threshold2:
+                    hd_action_reasoncode = reason
+                    break
+            else:
+                if score > score_threshold:
+                    hd_action_reasoncode = reason
+                    break
+
+        logging.info(f"hd_action_reasoncode: {hd_action_reasoncode}")
 
-        hd_action_reasoncode = next(
-            (reason for key, reason in action_reason_mapping.items() if data[key] > score_threshold),
-            "Pass"
-        )
-        logging.info(f"action_reasoncode: {hd_action_reasoncode}")
     except Exception as e:
-        logging.error(f"Error compiling action_reasoncode: {e}")
+        logging.error(f"Error determining action_reasoncode: {e}")
         return {}
 
+    # ---- Return only original 4 fields ----
     return {
         "hd_score": hd_score,
         "recommended_action": recommended_action,
diff --git a/test_block.py b/test_block.py
index 00f828c..cd06a67 100644
--- a/test_block.py
+++ b/test_block.py
@@ -1,7 +1,7 @@
 import unittest
 from block import __main__
 
-data = {'hd_score_m1': 1173.0, 'hd_score_g1': 1203.0, 'hd_score_s1': 1240.0, 'hd_score_s2': 0, 'hd_score_s3': 0}
+data = {'hd_score_m1': 1173.0, 'hd_score_g1': 1203.0, 'hd_score_s1': 1240.0, 'hd_score_s2': 0, 'hd_score_s3': 0, 'hd_score_iso_m2': 1001.0}
 
 class TestBlock(unittest.TestCase):
     def test_main_success(self):