EventNotificationType

Value	Triggered when	Notes
askSellerQuestion	An email to the seller is created on Bonanza
feedback	New feedback has been left for the seller
fixedPriceTransaction	The seller has sold an item on Bonanza	Can also use "auctionCheckoutComplete" or "itemSold" interchangeably
itemMarkedShipped	Seller has marked an item as shipped

Notification responses will take the following general form:

{
    "userId":42,
    "message":{
        "sym":"itemSold"
    },
    "happenedAt":"2015-01-06T21:59:34Z"
}