code: function (subscription, cb) {
  
  		Subscription.findOrCreate(subscription.id, subscription)
  	    .exec(function (err, foundSubscription){
  	      if (err) return cb(err);
  	      if (foundSubscription.lastStripeEvent > subscription.lastStripeEvent) return cb(null, foundSubscription);
  	      if (foundSubscription.lastStripeEvent == subscription.lastStripeEvent) return Subscription.afterStripeCustomerSubscriptionUpdated(foundSubscription, function(err, subscription){ return cb(err, subscription)});
  	      Subscription.update(foundSubscription.id, subscription)
  	      .exec(function(err, updatedSubscriptions){
  	      	if (err) return cb(err);
  	      	if(!updatedSubscriptions) return cb(null, null);
  	      	Subscription.afterStripeCustomerSubscriptionUpdated(updatedSubscriptions[0], function(err, subscription){
  	      		cb(err, subscription);
  	      	});
  	      });
  	    });
  	}
docs: Stripe Webhook customer.subscription.updated