core: fix api signature for view_key

passbook/core/api/tokens.py

@@ -1,6 +1,4 @@
 """Tokens API Viewset"""
-from uuid import UUID
-
 from django.http.response import Http404
 from rest_framework.decorators import action
 from rest_framework.request import Request
@@ -29,10 +27,9 @@ class TokenViewSet(ModelViewSet):
     serializer_class = TokenSerializer
 
     @action(detail=True)
-    # pylint: disable=invalid-name
-    def view_key(self, request: Request, pk: UUID) -> Response:
+    def view_key(self, request: Request, identifier: str) -> Response:
         """Return token key and log access"""
-        tokens = Token.filter_not_expired(pk=pk)
+        tokens = Token.filter_not_expired(identifier=identifier)
         if not tokens.exists():
             raise Http404
         token = tokens.first()