diff --git a/README.md b/README.md
index 2f027a4..8da7c90 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ SmoothCodeAuth.new(request_hmac, client_secret).dashboard_request?(shop) # retur
 require 'smoothcode'
 
 # SmoothCode sends hmac in the Authorization Header of the request
-# It is hmac of the webhook data signed by your App Client Secret
+# It is hmac of the webhook id signed by your App Client Secret
 
 SmoothCodeAuth.new(request_hmac, client_secret).webhook_request?(webhook_data) # returns True if the request is valid
 ```
diff --git a/lib/smoothcode/auth.rb b/lib/smoothcode/auth.rb
index 87aff64..a0aedfd 100644
--- a/lib/smoothcode/auth.rb
+++ b/lib/smoothcode/auth.rb
@@ -1,5 +1,4 @@
 require_relative 'utils'
-require 'json'
 
 class SmoothCodeAuth
     def initialize(request_hmac, client_secret)
@@ -12,6 +11,9 @@ def dashboard_request?(shop)
     end
 
     def webhook_request?(webhook_data)
-        generate_hmac(@client_secret, webhook_data.to_json) == @request_hmac
+        webhook_data = webhook_data.transform_keys(&:to_sym)
+        webhook_id = webhook_data[:id]
+
+        generate_hmac(@client_secret, webhook_id.to_s) == @request_hmac
     end
 end
diff --git a/smoothcode.gemspec b/smoothcode.gemspec
index 8b5a74b..c0b731c 100644
--- a/smoothcode.gemspec
+++ b/smoothcode.gemspec
@@ -1,6 +1,6 @@
 Gem::Specification.new do |s|
   s.name        = 'smoothcode'
-  s.version     = '0.0.2'
+  s.version     = '0.0.3'
   s.summary     = 'Ruby client to interact with SmoothCode'
   s.description = 'Ruby client to interact with SmoothCode'
   s.authors     = ['SmoothCode']