In order to process usage using printing as a service stream with metering, you must create meter type (product you want to meter) and meters (bucket to measure the usage per customer for the product). This step is usually done using an APIs which are called from the external system. For convenience, there has been additional stream streams provided which can be executed to do this configuration. Here is the step
Here is a step by step guide on how you can provision meters and meter types for an example stream - printing as a service.
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