OpManager Billing versus Netflow Analyzer?

OpManager Billing versus Netflow Analyzer?

I notice that OpManager has Bandwidth Billing functions, are these the same as what's in the Netflow Analyzer product or more enhanced or less?

we are looking for a single solution to manage IPAM, Network and Bandwidth Billing for our clients

ideally a single solution would be good but i couldnt see any IPAM function in OpManager so im assuming we need to use OpUtils and Netflow Analyzer themselves, which we have already been informed cant tie into each other?