ActionController::RoutingError (No route matches [POST] "/pay/webhooks/stripe")

I am trying to setup subscription in my Jumpstart app, but it looks like the Pay gem is having an issue that's resulting no Pay::Charge getting created, so no payments are getting recorded in the db. 

I am seeing this error in the log: `ActionController::RoutingError (No route matches [POST] "/pay/webhooks/stripe"):`. That's probably the reason no Pay::Charge is getting created. 

I checked rails routes and I am seeing pay related routes:

Routes for Pay::Engine:
           payment GET  /payments/:id(.:format)       pay/payments#show
   webhooks_stripe POST /webhooks/stripe(.:format)    stripe_event/webhook#event
webhooks_braintree POST /webhooks/braintree(.:format) pay/webhooks/braintree#create

If anyone has any hint, I really appreciate the help.