From c97325bf00f385845a9d8767f13968ab62d44237 Mon Sep 17 00:00:00 2001
From: Karol <kaholavan@hotmail.com>
Date: Sun, 3 Apr 2016 14:27:20 +0300
Subject: [PATCH] no access for this.parameters at isSignatureValid

force isSignatureValid useing this. of Pingback Object to get access for parameters otherwise its empty and therefore validation fails.
---
 lib/paymentwall/pingback.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/paymentwall/pingback.js b/lib/paymentwall/pingback.js
index 7dc65e2..8d300a0 100644
--- a/lib/paymentwall/pingback.js
+++ b/lib/paymentwall/pingback.js
@@ -25,7 +25,7 @@ util._extend(Pingback.prototype, {
 
 		if (this.isParametersValid()) {
 			if (this.isIpAddressValid() || skipIpWhitelistCheck) {
-				if (this.isSignatureValid()) {
+				if (this.isSignatureValid.bind(this)) {
 					validated = true;
 				} else {
 					this.appendToErrors('Wrong signature');
@@ -240,4 +240,4 @@ util._extend(Pingback.prototype, {
 	}
 });
 
-module.exports = Pingback;
\ No newline at end of file
+module.exports = Pingback;