In hindsight, I think a few instructions might be worthwhile...
1) Extract the ZIP file to your Lua folder (MQNext\Lua).
2) You should run this Lua (/lua run resupply) only in PoK or Guild Lobby.
3) You should modify the file 'resupply/config.lua' to select the items and quantities you want.
a) You can change the quantities in the '_M.Items' section if you want more or less of the item.
b) You add or remove the item itself in the 'items' section for each class in '_M.class'.
c) You can use a different quantity via the 'custom' section for the class. In the provided file, ['Pearl']=1 is used to make the NEC and SHD only buy 1 pearl (it is not consumed).
!!!Make sure to change the Axe component for the correct level for your BER - they can get expensive!!!
You don't need to worry about the '_M.vendors' or '_M.zones' sections of 'config.lua' unless you want to add your own stuff.
Note that this program does not currently use an .ini file, so if you re-install it will overwrite your 'config.lua'. So create a backup.