FA-60672 / Loyalty points ledgers / Member archive

Cancelled reward reinstatement: grace anchor · case 02

Reinstated points that had lapsed expire immediately or within days of reinstatement.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input {redemption:{day, sources:[[lot_expiry, pts]]}, cancel_day, grace, max_age}. Cancelling more than max_age days after the redemption returns {"error":"too late"}. Each source lot is reinstated with its original expiry if that expiry is on or after the cancel day, otherwise with expiry cancel_day + grace. Lots with the same resulting expiry are merged. Return {lots:[[expiry,pts]] by expiry, total}.

Why this case matters

Member point balances, statements and the program liability depend on this ledger rule.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
mixed sources	`{"lots": [[122, 300], [150, 200], [400, 100]], "total": 600}`	`{"lots": [[140, 300], [150, 200], [400, 100]], "total": 600}`	Failed

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