I would like to store some billing information about a client that we can see that the client cannot.  I know there is a whmcs addin but it looks like it costs money and i think that is overkill.  I thought there might be a way to use the service levels but there isnt even a provider in the dropdown so i cant install it to see what it is.  I read on here that it doesn't do very much but I thought maybe i would explore it.  Anybody have any ideas?

TIA