Obtain the list of Payment Methods? SuiteTalk C#.net

I have a piece of code that works splendidly for Shipping Methods, but I can't figure out how to get a similar list for Payment Methods??? Can anyone point me in the right direction?

            Console.WriteLine("Getting a list of Ship Methods...");
            var methods = new Hashtable();
            var shipMethodFieldDesc = new GetSelectValueFieldDescription()
            {
                field = "shipmethod",
                recordType = RecordType.estimate,
                recordTypeSpecified = true
            };

            var shipItems = _service.getSelectValue(shipMethodFieldDesc, 0);
            if (shipItems.status.isSuccess)
            {
                for (var i = 0; i < shipItems.totalRecords; i++)
                {
                    // cast to RecordRef
                    var itemRef = (RecordRef)shipItems.baseRefList[i];
                    methods.Add(itemRef.internalId, itemRef.name);
                    Console.WriteLine(itemRef.name + " = " + itemRef.internalId);
                }
            }