diff --git a/apps/sdlan/src/sdlan_api.erl b/apps/sdlan/src/sdlan_api.erl
index cea985f..b296dd0 100644
--- a/apps/sdlan/src/sdlan_api.erl
+++ b/apps/sdlan/src/sdlan_api.erl
@@ -167,6 +167,8 @@ sign_params(Params) when is_list(Params) ->
         <<K/binary, "=", V/binary>>
                       end, lists:sort(Keys)),
     SignBin = iolist_to_binary(lists:join(<<"&">>, Parts)),
+    logger:debug("sign: ~p, params: ~p", [SignBin, Params]),
+
     list_to_binary(sdlan_util:hmac(?API_TOKEN, SignBin));
 sign_params(Params) when is_map(Params) ->
     SortedKeys = lists:sort(maps:keys(Params)),
@@ -175,6 +177,7 @@ sign_params(Params) when is_map(Params) ->
         <<K/binary, "=", V/binary>>
                       end, SortedKeys),
     SignBin = iolist_to_binary(lists:join(<<"&">>, Parts)),
+    logger:debug("sign: ~p, params: ~p", [SignBin, Params]),
     list_to_binary(sdlan_util:hmac(?API_TOKEN, SignBin)).
 
 -spec as_binary(Bin :: any()) -> binary().