diff --git a/partner-kospinjasa.js b/partner-kospinjasa.js
index 6ec9444..293a692 100644
--- a/partner-kospinjasa.js
+++ b/partner-kospinjasa.js
@@ -83,6 +83,10 @@ function createSignature(args, password) {
         + args.timestamp
     ).digest().toString('hex');
 
+    if (logger) {
+        logger.verbose('Calculating signature', {result: result, args: args});
+    }
+
     return result;
 }