diff --git a/webapp/services/callback/common/SignatureService.php b/webapp/services/callback/common/SignatureService.php
index 9beb7055..b5ae0fac 100644
--- a/webapp/services/callback/common/SignatureService.php
+++ b/webapp/services/callback/common/SignatureService.php
@@ -4,4 +4,8 @@ namespace services;
 
 class SignatureService {
 
+    public static function check() {
+
+    }
+
 }