FA-59567 / Subscription proration billing / Member archive

Credit notes and customer balance on an invoice: balance application cap · case 02

Customers with large balances see negative amounts due and a drained balance.

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Case contract

Input {total, credit_notes, balance, min_payment}. Credit notes apply first, capped at the total; any excess credit-note value joins the customer balance. The balance then applies up to the remaining due. A remaining due above 0 but below min_payment is carried to the next invoice instead of charged. Return [due, balance_after, carried].

Why this case matters

Proration credits land as credit notes and balances whose application order determines the charge.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression 0	`[-15268, 0, 0]`	`[0, 15268, 0]`	Failed

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