This is a rework of the script from Internet Usage Monitoring – conky style! But the only problem I found is that it not wanted to work with my NodeMobile account. So here is my rewrite of parts of the script to use the other Internode Usage API url.
One thing you need to find out for this script to work is the service number for the account you want to get the usage for. That can be easily obtained by pointing your web browser to https://customer-webtools-api.internode.on.net/api/v1.5/ and logging in.