FA-59829 / Subscription proration billing / Member archive

Unused-time credit based on amount paid: credit basis · case 04

Customers who paid with a discount receive credits at the full list price.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Input {list, paid, status paid|partial|open|void|refunded, left, period}. Open, void and refunded invoices earn no unused-time credit. Paid and partially paid invoices earn paid*left/period half-up (the amount actually collected, not the list price). Return cents.

Why this case matters

Credits for unused time must not exceed what the customer actually paid for the period.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
regression 0	`316`	`20`	Failed

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