diff --git a/lib/ex_iceberg/rest/catalog.ex b/lib/ex_iceberg/rest/catalog.ex
index 400d897..8608812 100644
--- a/lib/ex_iceberg/rest/catalog.ex
+++ b/lib/ex_iceberg/rest/catalog.ex
@@ -44,7 +44,7 @@ defmodule ExIceberg.Rest.Catalog do
 
   defp authenticate(%Catalog{config: config, client: client} = catalog)
        when config.credential != nil do
-    base_url = config.authorization_uri || config.uri
+    base_url = config.oauth2_server_uri || config.uri
 
     optional_params =
       %{audience: config.audience, resource: config.resource}
@@ -75,8 +75,8 @@ defmodule ExIceberg.Rest.Catalog do
 
   defp authenticate(catalog), do: catalog
 
-  defp get_config(%Catalog{config: config} = catalog) do
-    Client.request(:get_config, config: config)
+  defp get_config(%Catalog{config: config, client: client} = catalog) do
+    client.request(:get_config, config: config)
 
     # TODO: Parse config and merge
     # (default_config (from api) + user_config + override_config(from api))
diff --git a/lib/ex_iceberg/rest/config.ex b/lib/ex_iceberg/rest/config.ex
index 1669f62..6eb6aa1 100644
--- a/lib/ex_iceberg/rest/config.ex
+++ b/lib/ex_iceberg/rest/config.ex
@@ -10,7 +10,7 @@ defmodule ExIceberg.Rest.Config do
     * `scope` - `openid offline corpds:ds:profile`: Desired scope of the requested security token (default: `catalog`).
     * `resource` - `rest_catalog.iceberg.com`: URI for the target resource or service.
     * `audience` - `rest_catalog`: Logical name of the target resource or service.
-    * `authorization_uri` - `https://auth-service/cc`: Authentication URL to use for client credentials authentication (default: `uri` + 'v1/oauth/tokens').
+    * `oauth2_server_uri` - `https://auth-service/cc`: Authentication URL to use for client credentials authentication (default: `uri` + 'v1/oauth/tokens').
   """
 
   defstruct uri: nil,
@@ -20,7 +20,7 @@ defmodule ExIceberg.Rest.Config do
             scope: "catalog",
             resource: nil,
             audience: nil,
-            authorization_uri: nil
+            oauth2_server_uri: nil
 
   @type t :: %__MODULE__{
           uri: String.t(),
@@ -30,7 +30,7 @@ defmodule ExIceberg.Rest.Config do
           scope: String.t(),
           resource: String.t(),
           audience: String.t(),
-          authorization_uri: String.t()
+          oauth2_server_uri: String.t()
         }
 
   def new(options) do
diff --git a/test/unit/rest/catalog_test.exs b/test/unit/rest/catalog_test.exs
index 7fce06e..b8a4954 100644
--- a/test/unit/rest/catalog_test.exs
+++ b/test/unit/rest/catalog_test.exs
@@ -3,11 +3,21 @@ defmodule ExIceberg.Rest.CatalogTest do
   alias ExIceberg.Rest.Catalog
 
   describe "new/2" do
+    defmodule DefaultMockClient do
+      def request(:get_token, config: _, base_url: _, form: _) do
+        {:ok, "some_token"}
+      end
+
+      def request(:get_config, _), do: {:ok, %{}}
+    end
+
     test "does not authenticate when credential does not exist" do
       defmodule MockClient do
-        def request(:get_token, config: _, base_url: _, form: params) do
+        def request(:get_token, config: _, base_url: _, form: _) do
           send(self(), :get_token)
         end
+
+        def request(:get_config, _), do: {:ok, %{}}
       end
 
       Catalog.new(
@@ -31,6 +41,8 @@ defmodule ExIceberg.Rest.CatalogTest do
 
           {:ok, "some_token"}
         end
+
+        def request(:get_config, _), do: {:ok, %{}}
       end
 
       defmodule MockClientWithResource do
@@ -44,6 +56,8 @@ defmodule ExIceberg.Rest.CatalogTest do
 
           {:ok, "some_token"}
         end
+
+        def request(:get_config, _), do: {:ok, %{}}
       end
 
       Catalog.new(
@@ -66,6 +80,8 @@ defmodule ExIceberg.Rest.CatalogTest do
 
           {:ok, "some_token"}
         end
+
+        def request(:get_config, _), do: {:ok, %{}}
       end
 
       defmodule MockClientWithSingleCred do
@@ -74,6 +90,8 @@ defmodule ExIceberg.Rest.CatalogTest do
 
           {:ok, "some_token"}
         end
+
+        def request(:get_config, _), do: {:ok, %{}}
       end
 
       Catalog.new(
@@ -90,20 +108,36 @@ defmodule ExIceberg.Rest.CatalogTest do
     end
 
     test "merge token into config when authenticated" do
-      defmodule MockClient do
-        def request(:get_token, config: _, base_url: _, form: params) do
-          {:ok, "some_token"}
-        end
-      end
-
       %{config: config} =
         Catalog.new(
           "catalog",
           %{uri: "http://localhost:8181", credential: "foo"},
-          MockClient
+          DefaultMockClient
         )
 
       assert config.token == "some_token"
     end
+
+    test "change the auth base url when oauth2_server_uri exists" do
+      defmodule MockClientCustomOauth do
+        def request(:get_token, config: _, base_url: base_url, form: _) do
+          assert base_url == "http://other_host.io"
+
+          {:ok, "some_token"}
+        end
+
+        def request(:get_config, _), do: {:ok, %{}}
+      end
+
+      Catalog.new(
+        "catalog",
+        %{
+          uri: "http://localhost:8181",
+          credential: "foo",
+          oauth2_server_uri: "http://other_host.io"
+        },
+        MockClientCustomOauth
+      )
+    end
   end
 end