From f81a2a731af99047ef54bb22198195bda0fa553b Mon Sep 17 00:00:00 2001
From: Rohit Rajat Chattopadhyay <rohit.chattopadhyay1@gmail.com>
Date: Fri, 10 Jan 2020 00:58:41 +0530
Subject: [PATCH] Add Signature verification for Invoice entity

Invoice entity includes Payment Links and Invoices system
---
 src/Utility.php | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/src/Utility.php b/src/Utility.php
index 22e588ff..db3c6c8f 100644
--- a/src/Utility.php
+++ b/src/Utility.php
@@ -35,6 +35,33 @@ public function verifyPaymentSignature($attributes)
         self::verifySignature($payload, $actualSignature, $secret);
     }
 
+    public function verifyInvoiceSignature($attributes)
+    {
+        $actualSignature = $attributes['razorpay_signature'];
+        
+        if (isset($attributes['razorpay_invoice_id']) === true)
+        {
+            $paymentId = $attributes['razorpay_payment_id'];
+            $invId = $attributes['razorpay_invoice_id'];
+            $invStatus = $attributes['razorpay_invoice_status'];
+            
+            $invReceipt = "";
+            if(isset($attributes['razorpay_invoice_receipt'])==true)
+                $invReceipt = $attributes['razorpay_invoice_receipt'];
+
+            $payload = $invId . '|' . $invReceipt . '|' . $invStatus . '|' . $paymentId;
+        }
+        else
+        {
+            throw new Errors\SignatureVerificationError(
+                'razorpay_invoice_id must be present.');
+        }
+
+        $secret = Api::getSecret();
+
+        self::verifySignature($payload, $actualSignature, $secret);
+    }
+
     public function verifyWebhookSignature($payload, $actualSignature, $secret)
     {
         self::verifySignature($payload, $actualSignature, $secret);