diff --git a/models.py b/models.py
index 49421a7..6b4ba0e 100644
--- a/models.py
+++ b/models.py
@@ -59,14 +59,14 @@ class WithdrawLink(BaseModel):
                 "withdraw.api_lnurl_response", unique_hash=self.unique_hash
             )
 
-        return lnurl_encode(url)
+        return lnurl_encode(str(url))
 
     def lnurl_response(self, req: Request) -> LnurlWithdrawResponse:
         url = req.url_for(
             name="withdraw.api_lnurl_callback", unique_hash=self.unique_hash
         )
         return LnurlWithdrawResponse(
-            callback=ClearnetUrl(url, scheme="https"),
+            callback=ClearnetUrl(str(url), scheme="https"),
             k1=self.k1,
             minWithdrawable=MilliSatoshi(self.min_withdrawable * 1000),
             maxWithdrawable=MilliSatoshi(self.max_withdrawable * 1000),
diff --git a/views_api.py b/views_api.py
index 525796c..25df3c3 100644
--- a/views_api.py
+++ b/views_api.py
@@ -1,4 +1,5 @@
 from http import HTTPStatus
+from typing import Optional
 
 from fastapi import Depends, HTTPException, Query, Request
 from lnurl.exceptions import InvalidUrl as LnurlInvalidUrl
@@ -66,7 +67,7 @@ async def api_link_retrieve(
 async def api_link_create_or_update(
     req: Request,
     data: CreateWithdrawData,
-    link_id: str = Query(None),
+    link_id: Optional[str] = None,
     wallet: WalletTypeInfo = Depends(require_admin_key),
 ):
     if data.uses > 250: