iginore xero.json and debug.log

XeroOauth2.php

@@ -576,7 +576,7 @@ class XeroOAuth2
         $xeroTenantId = $this->xeroTenantId;
         $page = 1;
         try {
-            $result = $api->getPayItems($xeroTenantId, $ifModifiedSince, $where, $order, $page);
+            $result = $api->getPayItems($xeroTenantId, null, null, null, $page);