diff --git a/src/taxgovme.py b/src/taxgovme.py
index 2fe47d7..325a8cd 100644
--- a/src/taxgovme.py
+++ b/src/taxgovme.py
@@ -41,6 +41,10 @@ class Invoice(BaseModel):
     def rounding_errors(self) -> Decimal:
         return self.total_price - sum(i.total_price for i in self.items)
 
+def invoice_factory(doc: dict) -> Invoice:
+    inv = Invoice.model_validate(doc)
+    inv.items.sort(key=lambda item: item.total_price, reverse=True)
+    return inv
 
 def query_verify_invoice(iic, dateTimeCreated, tin) -> dict:
     r = requests.post(
@@ -73,7 +77,4 @@ def query_verify_invoice_by_url(url) -> dict:
 
 def invoice_by_url(url: str) -> Invoice:
     invoice_dict = query_verify_invoice_by_url(url)
-    inv = Invoice.model_validate(invoice_dict)
-    inv.items.sort(key=lambda item: item.total_price, reverse=True)
-
-    return inv
\ No newline at end of file
+    return invoice_factory(invoice_dict)