Default request arguments should be part of the service specific configuration

src/idpyoidc/client/entity.py

@@ -126,7 +126,7 @@ def __init__(
         jwks_uri = jwks_uri or self.get_metadata_value("jwks_uri")
         set_jwks_uri_or_jwks(self, self._service_context, config, jwks_uri, _kj)
 
-        # Deal with backward compatible
+        # Deal with backward compatibility
         self.backward_compatibility(config)
 
         self.construct_uris(self._service_context.issuer,
@@ -351,6 +351,11 @@ def backward_compatibility(self, config):
                            "usage", "services", "add_ons"]:
                 self.extra[key] = val
 
+        auth_request_args = config.conf.get("request_args", {})
+        if auth_request_args:
+            authz_serv = self.get_service('authorization')
+            authz_serv.default_request_args.update(auth_request_args)
+
     def config_args(self):
         res = {}
         for id, service in self._service.items():

src/idpyoidc/client/oidc/authorization.py

@@ -32,7 +32,7 @@ class Authorization(authorization.Authorization):
 
     def __init__(self, client_get, conf=None):
         authorization.Authorization.__init__(self, client_get, conf=conf)
-        self.default_request_args = {"scope": ["openid"]}
+        self.default_request_args.update({"scope": ["openid"]})
         self.pre_construct = [
             self.set_state,
             pre_construct_pick_redirect_uri,

src/idpyoidc/client/service.py

@@ -113,6 +113,11 @@ def __init__(
                     elif def_val is not None:
                         self.usage[param] = def_val
 
+            _default_request_args = conf.get("request_args", {})
+            if _default_request_args:
+                self.default_request_args = _default_request_args
+                del conf["request_args"]
+
         else:
             self.conf = {}
 
@@ -164,6 +169,10 @@ def gather_request_args(self, **kwargs):
             if val:
                 ar_args[prop] = val
 
+        for key, val in self.default_request_args.items():
+            if key not in ar_args:
+                ar_args[key] = val
+
         return ar_args
 
     def method_args(self, context, **kwargs):