FA-60652 / Loyalty points ledgers / Member archive

Partner miles conversion: ratio orientation · case 02

Members get 4 miles for every 3 points on a 3:4 program.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input {pts, block, min_pts, num, den, bonus_bp, threshold}. Usable points = pts floored to a block; usable below min_pts returns {"error"}. Miles = floor(usable*num/den). If usable >= threshold, bonus miles = floor(miles*bonus_bp/10000). Leftover points stay in the account. Return {used, miles, bonus, leftover}.

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
normal	`{"bonus": 4000, "leftover": 752, "miles": 16000, "used": 12000}`	`{"bonus": 2250, "leftover": 752, "miles": 9000, "used": 12000}`	Failed

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