How to Prorate the bill amount by unitprice for recurring charges in subscription

Summary:

We have requirement to display (groovy script)prorate value in billing summary based on billamount/unitprice for each bill line.

example: 1/1/2025 to 1/31/2025 bill maount-100$

unitprice - 2$

Prorate =100$/2$=50$

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