No route matches [POST] "/webhooks/orders/fulfilled" Shopify rails - ruby-on-rails

Question

I use the shopify CLI to create a Shopify Rails App, and I want to integrate a webhook, this is my configuration:
config/initializers/shopify_app.rb
ShopifyApp.configure do |config|
config.application_name = "My Shopify App"
config.api_key = ENV['SHOPIFY_API_KEY']
config.secret = ENV['SHOPIFY_API_SECRET']
config.old_secret = ""
config.scope = ENV['SCOPES'] # Consult this page for more scope options:
# https://help.shopify.com/en/api/getting-started/authentication/oauth/scopes
config.embedded_app = true
config.after_authenticate_job = false
config.api_version = "2020-10"
config.shop_session_repository = 'Shop'
config.allow_jwt_authentication = true
config.webhooks = [
{topic: 'orders/fulfilled', address: 'https://4d132e9604.ngrok.io/webhooks/orders/fulfilled', format: 'json'},
]
end
config/routes.rb
Rails.application.routes.draw do
root :to => 'home#index'
mount ShopifyApp::Engine, at: '/'
# For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
end
app/jobs/fulfilled_job.rb
class FulfilledJob < ActiveJob::Base
def perform(shop_domain:, webhook:)
shop = Shop.find_by(shopify_domain: shop_domain)
puts "called hook!!!!"
if shop.nil?
logger.error("#{self.class} failed: cannot find shop with domain '#{shop_domain}'")
return
end
puts "before shop"
shop.with_shopify_session do
puts "in shop with_shopify_session"
end
end
end
The webhooks was registered successfully on my store, and it is called without a problem, but in my app, I can process it, I receive a No route matches [POST] "/webhooks/orders/fulfilled" error , but I think it registers well:
this is the full stacktrace:
Started POST "/webhooks/orders/fulfilled" for 127.0.0.1 at 2020-11-09 12:18:26 -0500
ActionController::RoutingError (No route matches [POST] "/webhooks/orders/fulfilled"):
actionpack (6.0.3.4) lib/action_dispatch/middleware/debug_exceptions.rb:36:in `call'
web-console (4.1.0) lib/web_console/middleware.rb:132:in `call_app'
web-console (4.1.0) lib/web_console/middleware.rb:28:in `block in call'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `catch'
web-console (4.1.0) lib/web_console/middleware.rb:17:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/show_exceptions.rb:33:in `call'
railties (6.0.3.4) lib/rails/rack/logger.rb:37:in `call_app'
railties (6.0.3.4) lib/rails/rack/logger.rb:26:in `block in call'
activesupport (6.0.3.4) lib/active_support/tagged_logging.rb:80:in `block in tagged'
activesupport (6.0.3.4) lib/active_support/tagged_logging.rb:28:in `tagged'
activesupport (6.0.3.4) lib/active_support/tagged_logging.rb:80:in `tagged'
railties (6.0.3.4) lib/rails/rack/logger.rb:26:in `call'
sprockets-rails (3.2.2) lib/sprockets/rails/quiet_assets.rb:13:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/remote_ip.rb:81:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/request_id.rb:27:in `call'
rack (2.2.3) lib/rack/method_override.rb:24:in `call'
shopify_app (15.0.0) lib/shopify_app/middleware/jwt_middleware.rb:23:in `call_next'
shopify_app (15.0.0) lib/shopify_app/middleware/jwt_middleware.rb:14:in `call'
shopify_app (15.0.0) lib/shopify_app/middleware/same_site_cookie_middleware.rb:11:in `call'
rack (2.2.3) lib/rack/runtime.rb:22:in `call'
activesupport (6.0.3.4) lib/active_support/cache/strategy/local_cache_middleware.rb:29:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/executor.rb:14:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/static.rb:126:in `call'
rack (2.2.3) lib/rack/sendfile.rb:110:in `call'
actionpack (6.0.3.4) lib/action_dispatch/middleware/host_authorization.rb:82:in `call'
webpacker (4.3.0) lib/webpacker/dev_server_proxy.rb:23:in `perform_request'
rack-proxy (0.6.5) lib/rack/proxy.rb:57:in `call'
railties (6.0.3.4) lib/rails/engine.rb:527:in `call'
puma (4.3.6) lib/puma/configuration.rb:228:in `call'
puma (4.3.6) lib/puma/server.rb:713:in `handle_request'
puma (4.3.6) lib/puma/server.rb:472:in `process_client'
puma (4.3.6) lib/puma/server.rb:328:in `block in run'
puma (4.3.6) lib/puma/thread_pool.rb:134:in `block in spawn_thread'
Any thoughts? maybe I forget some configuration?