How the merchant invoice is displayed when appUsageRecordCreate is hit multiple times

I’m trying to develop an app that does subscription billing using usage billing.

https://shopify.dev/apps/billing/subscriptions#usage-billing

If I hit the mutation in appUsageRecordCreate multiple times in a given billing cycle, how will it appear on the merchant’s invoice?
If I hit this multiple times in a given billing cycle, how will it appear on the merchant’s invoice? Will it be a single amount within the billing cycle, or will the statement increase by the number of mutations hit?

It seems that when the app is uninstalled, the subscription is canceled and the app can’t hit mutation, so I’d like to hit that frequently to finalize the billing.