[sirinsidiator]

There is currently no API method to get the vouchers, but you can use the following function as a workaround:

local function GetItemLinkWritVoucherCount(itemLink)
    local data = select(24, ZO_LinkHandler_ParseLink(itemLink))
    local vouchers = tonumber(data) / 10000
    return tonumber(string.format("%.0f", vouchers))
end