Add more logging to PuSH callback

app/controllers/api/subscriptions_controller.rb

@@ -4,6 +4,7 @@ class Api::SubscriptionsController < ApiController
 
   def show
     if @account.subscription(api_subscription_url(@account.id)).valid?(params['hub.topic'])
+      Rails.logger.debug "PuSH confirmation with lease_seconds: #{params['hub.lease_seconds']}"
       @account.update(subscription_expires_at: Time.now + (params['hub.lease_seconds'].to_i).seconds)
       render plain: HTMLEntities.new.encode(params['hub.challenge']), status: 200
     else