Fix Jasmin customer key and amount mapping

app/external_reconciliation_sync.py

@@ -221,7 +221,21 @@ def _looks_like_company_name(value: Any) -> bool:
 
 def _external_customer_key(record: Dict[str, Any], *, source_system: str) -> str:
     if source_system == "jasmin":
-        return _clean(_first(record, "partyKey", "customerPartyKey", "naturalKey", "key", "id"))
+        # A document naturalKey identifies the commercial document
+        # (for example ORC.ORC2026.136), not the customer. Prefer the
+        # customer party code exposed by Jasmin and never fall back to the
+        # document naturalKey when seeding/updating a fiscal customer.
+        return _clean(
+            _first(
+                record,
+                "partyKey",
+                "customerPartyKey",
+                "buyerCustomerParty",
+                "accountingParty",
+                "buyerCustomerPartyKey",
+                "accountingPartyKey",
+            )
+        )
     if source_system == "odoo":
         return _clean(_first(record, "partner_external_id", "id"))
     return _clean(_first(record, "id", "key", "externalId"))
@@ -355,7 +369,36 @@ def _jasmin_external_type(record: Dict[str, Any], default_type: str) -> str:
 
 
 def _jasmin_amount(record: Dict[str, Any]) -> Optional[str]:
-    return _decimal_or_none(_first(record, "payableAmount", "totalAmount", "total", "grossAmount", "amount"))
+    # Recent Jasmin payloads expose both flattened numeric fields and nested
+    # money objects. Prefer the payable total including tax.
+    direct = _first(
+        record,
+        "payableAmountAmount",
+        "totalAmount",
+        "grossValueAmount",
+        "taxExclusiveAmountAmount",
+        "total",
+        "grossAmount",
+        "amount",
+    )
+    if direct not in (None, ""):
+        parsed = _decimal_or_none(direct)
+        if parsed is not None:
+            return parsed
+
+    for key in ("payableAmount", "grossValue", "taxExclusiveAmount"):
+        money = record.get(key)
+        if isinstance(money, dict):
+            parsed = _decimal_or_none(
+                _first(money, "amount", "baseAmount", "reportingAmount")
+            )
+            if parsed is not None:
+                return parsed
+        elif money not in (None, ""):
+            parsed = _decimal_or_none(money)
+            if parsed is not None:
+                return parsed
+    return None
 
 
 def _jasmin_candidate_from_record(record: Dict[str, Any], *, default_type: str) -> Optional[Dict[str, Any]]: