code: function (subscription, cb) {
  
  		Subscription.destroy(subscription.id)
  	    .exec(function (err, destroyedSubscriptions){
  	      if (err) return cb(err);
  	      if (!destroyedSubscriptions) return cb(null, subscription);
  	      Subscription.afterStripeCustomerSubscriptionDeleted(destroyedSubscriptions[0], function(err, subscription){
  	      	cb(err, subscription);
  	      });
  	    });
  	}
docs: Stripe Webhook customer.subscription.deleted