"In a UBP world, metering (usage) is the system of record; not pricing. Pricing is ephemeral…pricing will change, pricing will come and go. Metering records have to be kept intact, and accurate. If your metering records are intact (clean, untangled, accurate, easily and readily accessible, with a standardized interface), you are set for life!"

https://www.amberflo.io/blog/founders-perspective