Build Event object in controller instead of service object

app/controllers/stripe/webhooks_controller.rb

@@ -7,7 +7,8 @@ module Stripe
     # POST /stripe/webhook
     def create
       # TODO is there a sensible way to confirm this webhook call is actually from Stripe?
-      handler = WebhookHandler.new(params)
+      event = Event.construct_from(params)
+      handler = WebhookHandler.new(event)
       result = handler.handle
 
       render nothing: true, status: status_mappings[result]

lib/stripe/webhook_handler.rb

@@ -1,7 +1,7 @@
 module Stripe
   class WebhookHandler
-    def initialize(params)
-      @event = Event.construct_from(params)
+    def initialize(event)
+      @event = event
     end
 
     def handle

spec/lib/stripe/webhook_handler_spec.rb

@@ -3,8 +3,8 @@ require 'stripe/webhook_handler'
 
 module Stripe
   describe WebhookHandler do
-    let(:params) { { type: 'some.event' } }
-    let(:handler) { WebhookHandler.new(params) }
+    let(:event) { double(:event, type: 'some.event') }
+    let(:handler) { WebhookHandler.new(event) }
 
     describe "event_mappings" do
       it { expect(handler.send(:event_mappings)).to be_a Hash }
@@ -62,7 +62,7 @@ module Stripe
 
       context "when the event has an 'account' attribute" do
         before do
-          params[:account] = 'some.account'
+          allow(event).to receive(:account) { 'some.account' }
         end
 
         context "when some stripe accounts are destroyed" do