Correct way to collect usage data in vCloud using the API

Hi,

I am building an application which will provision objects in vCloud using the RESTfull API. I am hoping, I will be able to provision organizations, org VDC, and vApps to start with.

I would also like to use an API to collect usage data of these provisioned resources, as well as other resources (networks, firewalls, VPN's, etc) that might be provisioned by users directly from the vCloud portal. If I just want to programmatically get daily usage data for all objects that have been provisioned, which of these would be the appropriate way to get it:

• vCloud API
• VMWare Usage Meter
• VMWare Chargeback Server

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Thanks

Parag