diff --git a/src/oidcop/__init__.py b/src/oidcop/__init__.py
index 728a997..38400fc 100644
--- a/src/oidcop/__init__.py
+++ b/src/oidcop/__init__.py
@@ -1,6 +1,6 @@
 import secrets
 
-__version__ = "2.4.0"
+__version__ = "2.4.1"
 
 DEF_SIGN_ALG = {
     "id_token": "RS256",
diff --git a/src/oidcop/oauth2/add_on/extra_args.py b/src/oidcop/oauth2/add_on/extra_args.py
index 68a8a84..ddfd3d4 100644
--- a/src/oidcop/oauth2/add_on/extra_args.py
+++ b/src/oidcop/oauth2/add_on/extra_args.py
@@ -1,3 +1,10 @@
+from oidcmsg.oauth2 import AccessTokenResponse
+from oidcmsg.oauth2 import AuthorizationResponse
+from oidcmsg.oauth2 import TokenExchangeResponse
+from oidcmsg.oauth2 import TokenIntrospectionResponse
+from oidcmsg.oidc import OpenIDSchema
+
+
 def pre_construct(response_args, request, endpoint_context, **kwargs):
     """
     Add extra arguments to the request.
@@ -11,12 +18,25 @@ def pre_construct(response_args, request, endpoint_context, **kwargs):
 
     _extra = endpoint_context.add_on.get("extra_args")
     if _extra:
-        for arg, _param in _extra.items():
-            _val = endpoint_context.get(_param)
+        if isinstance(response_args, AuthorizationResponse):
+            _args = _extra.get("authorization", {})
+        elif isinstance(response_args, AccessTokenResponse):
+            _args = _extra.get('accesstoken', {})
+        elif isinstance(response_args, TokenExchangeResponse):
+            _args = _extra.get('token_exchange', {})
+        elif isinstance(response_args, TokenIntrospectionResponse):
+            _args = _extra.get('token_introspection', {})
+        elif isinstance(response_args, OpenIDSchema):
+            _args = _extra.get('userinfo', {})
+        else:
+            _args = {}
+
+        for arg, _param in _args.items():
+            _val = getattr(endpoint_context, _param)
             if _val:
-                request[arg] = _val
+                response_args[arg] = _val
 
-    return request
+    return response_args
 
 
 def add_support(endpoint, **kwargs):
diff --git a/tests/test_61_add_on.py b/tests/test_61_add_on.py
index e6c2b8e..0b4b7e6 100644
--- a/tests/test_61_add_on.py
+++ b/tests/test_61_add_on.py
@@ -1,4 +1,5 @@
 import os
+from urllib.parse import urlparse
 
 from cryptojwt.jwk.ec import ECKey
 from cryptojwt.jwk.ec import new_ec_key
@@ -6,6 +7,7 @@
 from cryptojwt.key_jar import init_key_jar
 from oidcmsg.oauth2 import AccessTokenRequest
 from oidcmsg.oauth2 import AuthorizationRequest
+from oidcmsg.oauth2 import AuthorizationResponse
 from oidcmsg.time_util import utc_time_sans_frac
 
 from oidcop.authn_event import create_authn_event
@@ -155,15 +157,10 @@ def test_process_request(self):
         _context = self.endpoint.server_get("endpoint_context")
         assert _context.add_on["extra_args"] == {'authorization': {'iss': 'issuer'}}
 
-        _pr_resp = self.endpoint.parse_request(AUTH_REQ.to_dict())
-        _resp = self.endpoint.process_request(_pr_resp)
-        assert set(_resp.keys()) == {
-            "response_args",
-            "fragment_enc",
-            "return_uri",
-            "cookie",
-            "session_id",
-        }
-
-        assert 'iss' in _resp["response_args"]
-        assert _resp["response_args"]["iss"] == _context.issuer
+        _pr_resp = self.endpoint.parse_request(AUTH_REQ)
+        _args = self.endpoint.process_request(_pr_resp)
+        _resp = self.endpoint.do_response(request=AUTH_REQ, **_args)
+        parse_res = urlparse(_resp["response"])
+        _payload = AuthorizationResponse().from_urlencoded(parse_res.query)
+        assert 'iss' in _payload
+        assert _payload["iss"] == _context.issuer