diff --git a/api/tabs/open.cfm b/api/tabs/open.cfm
index 5d1db6d..b69ec8a 100644
--- a/api/tabs/open.cfm
+++ b/api/tabs/open.cfm
@@ -25,7 +25,12 @@ try {
 
     userID = val(requestData.UserID ?: 0);
     businessID = val(requestData.BusinessID ?: 0);
-    authAmount = val(requestData.AuthAmount ?: 0);
+    // Accept AuthAmount (dollars) or AuthAmountCents (cents)
+    if (structKeyExists(requestData, "AuthAmountCents") && val(requestData.AuthAmountCents) > 0) {
+        authAmount = val(requestData.AuthAmountCents) / 100;
+    } else {
+        authAmount = val(requestData.AuthAmount ?: 0);
+    }
     servicePointID = val(requestData.ServicePointID ?: 0);
 
     if (userID == 0) apiAbort({ "OK": false, "ERROR": "missing_UserID" });