third party update , optional body is done

src/lookups/fanavaran-last-car-policy.spec.ts

@@ -5,6 +5,8 @@ import {
   fanavaranPayloadMatchesDamagedIdentity,
   fanavaranVehicleMatchesDamagedIdentity,
   filterPoliciesByLine,
+  applyFanavaranManualPayloadOverrides,
+  resolveDamageCasePlaqueLookupIds,
   insuranceLineLabel,
   parseLastCarPolicyInput,
   pickFanavaranPlaqueLookupFields,
@@ -465,4 +467,38 @@ describe("fanavaran last car policy", () => {
       ),
     ).toBe(true);
   });
+
+  it("uses national plaque 8/10 when the damaged VIN is unknown to Fanavaran", () => {
+    expect(resolveDamageCasePlaqueLookupIds(null)).toEqual({
+      kindId: 8,
+      sampleId: 10,
+      source: "national-plate-default",
+    });
+  });
+
+  it("keeps live PlaqueKindId 8 when Swagger body still has stale 15", () => {
+    expect(
+      applyFanavaranManualPayloadOverrides(
+        {
+          PlaqueKindId: 8,
+          PlaqueSampleId: 10,
+          VehicleKindId: 6704,
+          AccidentVehicleUsedId: 1,
+          Desc: "سپر جلو",
+        },
+        {
+          PlaqueKindId: 15,
+          PlaqueSampleId: 24,
+          Desc: "سپر جلو (edited)",
+        },
+        ["Desc", "EstimateAmount", "LicenceNo"],
+      ),
+    ).toEqual({
+      PlaqueKindId: 8,
+      PlaqueSampleId: 10,
+      VehicleKindId: 6704,
+      AccidentVehicleUsedId: 1,
+      Desc: "سپر جلو (edited)",
+    });
+  });
 });