diff --git a/data/refdata/exchanges.cfg b/data/refdata/exchanges.cfg
index d8d8a36..5d7f9ce 100644
--- a/data/refdata/exchanges.cfg
+++ b/data/refdata/exchanges.cfg
@@ -155,7 +155,8 @@
             }
         }
         , "accounting": {
-            "class":  "cvttpy_trading.exchanges.alpaca.acct_client.AlpacaAccounting"
+            "credentials_key":  "ALPACA_SANDBOX"
+            , "class":  "cvttpy_trading.exchanges.alpaca.acct_client.AlpacaAccounting"
 
             # D E P R E C A T E D
             , "REST": {