Cost
Parameters
id
the upgrade's ID
name
the cost's name
description
the upgrade's description
type
the cost's type
icon
the URL for the upgrade's icon
buildTime
the time it takes to build the upgrade
requiredLevel
the prerequisite level the guild must be at to build the upgrade
experience
the amount of guild experience that will be awarded upon building the upgrade
prerequisites
an array of upgrade IDs that must be completed before this can be built
costs
an array of objects describing the upgrade's cost
count
the amount needed
itemId
the ID of the cost's item