diff --git a/src/applications/phortune/provider/PhortunePaymentProvider.php b/src/applications/phortune/provider/PhortunePaymentProvider.php
--- a/src/applications/phortune/provider/PhortunePaymentProvider.php
+++ b/src/applications/phortune/provider/PhortunePaymentProvider.php
@@ -96,7 +96,7 @@
     array $issues);
 
   protected function renderConfigurationSecret($value) {
-    if (strlen($value)) {
+    if (phutil_nonempty_string($value)) {
       return str_repeat('*', strlen($value));
     }
     return '';