
This story was originally published on HackerNoon at: https://hackernoon.com/a-borrower-pays-euro100-where-does-the-money-go.
How payment allocation exposes a deeper Financial Product Engineering challenge: turning financial intent into precise, reliable, evolvable software behavior.
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A €100 borrower payment has no universal destination — its allocation across past-due, due, and future installments, and across principal, interest, fees, and penalties, is a policy decision. Financial Product Engineering turns a lender's intent into precise, deterministic, evolvable software behavior: configurability with exact semantics, chronological event processing, rule changes that preserve existing contracts, and testing lifecycles, not calculations.
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