diff --git a/help_scout-sdk.gemspec b/help_scout-sdk.gemspec
index 9aff303..5670a0c 100644
--- a/help_scout-sdk.gemspec
+++ b/help_scout-sdk.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.email         = ['support@taxjar.com']
 
   spec.summary       = 'Ruby Help Scout SDK'
-  spec.description   = 'Ruby Help Scout (aka HelpScout) SDK.'
+  spec.description   = 'Ruby Help Scout (aka HelpScout) SDK, using Mailbox API v2.0'
   spec.homepage      = 'https://github.com/taxjar/help_scout-sdk'
   spec.license       = 'MIT'
 
diff --git a/lib/help_scout/api/access_token.rb b/lib/help_scout/api/access_token.rb
index 6a548be..3759251 100644
--- a/lib/help_scout/api/access_token.rb
+++ b/lib/help_scout/api/access_token.rb
@@ -31,18 +31,17 @@ def token_request_params
       end
 
       attr_accessor :invalid
-      attr_reader :expires_in, :value
+      attr_reader :expires_at, :expires_in, :value
 
       def initialize(params)
         @value = params[:access_token]
         @expires_in = params[:expires_in]
-      end
-
-      def expires_at
-        @_expires_at ||= Time.now.utc + expires_in
+        return unless @expires_in
+        @expires_at = Time.now.utc + expires_in
       end
 
       def expired?
+        return false unless expires_at
         Time.now.utc > expires_at
       end
 
diff --git a/lib/help_scout/version.rb b/lib/help_scout/version.rb
index 2b49ba9..b00b3cb 100644
--- a/lib/help_scout/version.rb
+++ b/lib/help_scout/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module HelpScout
-  VERSION = '1.0.1'
+  VERSION = '1.0.2'
 end