Summarize bill lines from subscription before sending to AR invoicing

Summary:

Our client has the requirement to have usage products have a daily price periodicity in subscription management, and are billed monthly. With this set up, a monthly invoice will have 30/31 lines for each month (if usage data came in) which creates a large invoice. They don't want their customers to see the data for each day, and want these 30/31 lines to be summed on the AR invoice into one line. What possibilities exist to do this?

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