diff --git a/lib/vero/config.rb b/lib/vero/config.rb
index f3dbc12..80c34a3 100644
--- a/lib/vero/config.rb
+++ b/lib/vero/config.rb
@@ -58,9 +58,8 @@ def reset!
   def update_attributes(attributes = {})
     return unless attributes.is_a?(Hash)
 
-    Vero::Config::ACCEPTED_ATTRIBUTES.each do |symbol|
-      method_name = :"#{symbol}="
-      send(method_name, attributes[symbol]) if attributes.key?(symbol) && respond_to?(method_name)
-    end
+    Vero::Config::ACCEPTED_ATTRIBUTES
+      .select { |attr| attributes.key?(attr) }
+      .each { |attr| public_send(:"#{attr}=", attributes[attr]) }
   end
 end
diff --git a/lib/vero/sender.rb b/lib/vero/sender.rb
index 60b602a..c213226 100644
--- a/lib/vero/sender.rb
+++ b/lib/vero/sender.rb
@@ -7,7 +7,8 @@ def self.senders
     end
 
     def self.call(api_class, sender_strategy, domain, options)
-      senders[sender_strategy].new.call(api_class, domain, options)
+      sender = senders[sender_strategy].new
+      sender.call(api_class, domain, options)
     rescue => e
       Vero::App.log(new, "method: #{api_class.name}, options: #{JSON.dump(options)}, error: #{e.message}")
       raise e
diff --git a/lib/vero/senders/base.rb b/lib/vero/senders/base.rb
index 5147a9d..50a6372 100644
--- a/lib/vero/senders/base.rb
+++ b/lib/vero/senders/base.rb
@@ -2,9 +2,29 @@
 
 class Vero::Senders::Base
   def call(api_class, domain, options)
-    response = api_class.perform(domain, options)
+    api_class = get_api_class(api_class)
 
-    Vero::App.log(self, "method: #{api_class.name}, options: #{JSON.dump(options)}, response: job performed")
-    response
+    resp = enqueue_work(api_class, domain, options)
+    Vero::App.log(self, "method: #{api_class.name}, options: #{JSON.dump(options)}, response: #{log_message}")
+
+    resp
+  end
+
+  def enqueue_work(api_class, domain, options)
+    api_class.perform(domain, options)
+  end
+
+  def log_message
+    "job performed"
+  end
+
+  def get_api_class(klass_name)
+    return klass_name unless klass_name.is_a?(String)
+
+    if Object.const_defined?(klass_name)
+      Object.const_get(klass_name)
+    else
+      raise ArgumentError, "Invalid API class name: #{klass_name}"
+    end
   end
 end
diff --git a/lib/vero/senders/delayed_job.rb b/lib/vero/senders/delayed_job.rb
index ef488e8..ba067f7 100644
--- a/lib/vero/senders/delayed_job.rb
+++ b/lib/vero/senders/delayed_job.rb
@@ -2,15 +2,18 @@
 
 require "delayed_job"
 
-class Vero::Senders::DelayedJob
-  def call(api_class, domain, options)
-    response = ::Delayed::Job.enqueue api_class.new(domain, options)
-
-    Vero::App.log(self, "method: #{api_class.name}, options: #{JSON.dump(options)}, response: delayed job queued")
-    response
+class Vero::Senders::DelayedJob < Vero::Senders::Base
+  def enqueue_work(api_class, domain, options)
+    ::Delayed::Job.enqueue api_class.new(domain, options)
   rescue => e
-    raise "To send ratings asynchronously, you must configure delayed_job. Run `rails generate delayed_job:active_record` then `rake db:migrate`." if e.message == "Could not find table 'delayed_jobs'"
+    if e.message == "Could not find table 'delayed_jobs'"
+      raise "To send requests asynchronously, you must configure delayed_job. Run `rails generate delayed_job:active_record` then `rake db:migrate`."
+    end
 
     raise e
   end
+
+  def log_message
+    "delayed job queued"
+  end
 end
diff --git a/lib/vero/senders/resque.rb b/lib/vero/senders/resque.rb
index b34bcbf..2bf96b3 100644
--- a/lib/vero/senders/resque.rb
+++ b/lib/vero/senders/resque.rb
@@ -1,5 +1,9 @@
-class Vero::Senders::Resque
-  def call(api_class, domain, options)
+class Vero::Senders::Resque < Vero::Senders::Base
+  def enqueue_work(api_class, domain, options)
     ::Resque.enqueue(::Vero::ResqueWorker, api_class.to_s, domain, options)
   end
+
+  def log_message
+    "resque job queued"
+  end
 end
diff --git a/lib/vero/senders/sidekiq.rb b/lib/vero/senders/sidekiq.rb
index aa50651..dcdacb9 100644
--- a/lib/vero/senders/sidekiq.rb
+++ b/lib/vero/senders/sidekiq.rb
@@ -1,9 +1,9 @@
-class Vero::Senders::Sidekiq
-  def call(api_class, domain, options)
-    response = ::Vero::SidekiqWorker.perform_async(api_class.to_s, domain, options)
-
-    Vero::App.log(self, "method: #{api_class.name}, options: #{JSON.dump(options)}, response: sidekiq job queued")
+class Vero::Senders::Sidekiq < Vero::Senders::Base
+  def enqueue_work(api_class, domain, options)
+    ::Vero::SidekiqWorker.perform_async(api_class.to_s, domain, options)
+  end
 
-    response
+  def log_message
+    "sidekiq job queued"
   end
 end
diff --git a/lib/vero/senders/sucker_punch.rb b/lib/vero/senders/sucker_punch.rb
index 65e5195..3bfb184 100644
--- a/lib/vero/senders/sucker_punch.rb
+++ b/lib/vero/senders/sucker_punch.rb
@@ -1,5 +1,9 @@
-class Vero::Senders::SuckerPunch
-  def call(api_class, domain, options)
+class Vero::Senders::SuckerPunch < Vero::Senders::Base
+  def enqueue_work(api_class, domain, options)
     ::Vero::SuckerPunchWorker.perform_async(api_class, domain, options)
   end
+
+  def log_message
+    "sucker punch job queued"
+  end
 end
diff --git a/lib/vero/trackable/base.rb b/lib/vero/trackable/base.rb
index 4fc7bf5..c332387 100644
--- a/lib/vero/trackable/base.rb
+++ b/lib/vero/trackable/base.rb
@@ -27,25 +27,33 @@ def reset_trackable_map!
       end
 
       def to_vero
-        klass = self.class
-        symbols, other = klass.trackable_map.partition { |i| i.is_a?(Symbol) }
+        trackable_attrs, other = self.class.trackable_map.partition { |i| i.is_a?(Symbol) }
 
-        result = symbols.each_with_object({}) do |symbol, hash|
-          t = respond_to?(symbol) ? send(symbol) : nil
-          hash[symbol] = t unless t.nil?
+        result = trackable_attrs.each_with_object({}) do |attr, hash|
+          value = public_send(attr) if respond_to?(attr)
+          hash[attr] = value unless value.nil?
         end
 
         if other.is_a?(Array) && !other.empty?
           other.select! { |i| i.is_a?(Hash) && i.key?(:extras) }
+
           other.each do |h|
-            symbol = h[:extras]
-            t = respond_to?(symbol, true) ? send(symbol) : nil
-            result.merge!(t) if t.is_a?(Hash)
+            attr = h[:extras]
+
+            # `extras` methods can be private
+            if respond_to?(attr, true)
+              value = send(attr)
+              result.merge!(value) if value.is_a?(Hash)
+            end
           end
         end
 
-        result[:email] = result.delete(:email_address) if result.key?(:email_address)
+        if result.key?(:email_address)
+          result[:email] = result.delete(:email_address)
+        end
+
         result[:_user_type] = self.class.name
+
         result
       end