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Subscription-mode billing was consuming quota at TotalCost (raw) instead of ActualCost (TotalCost * RateMultiplier), so per-group rate multipliers — including free subscriptions (multiplier = 0) — were silently ignored. Switch the three subscription cost writes in buildUsageBillingCommand, finalizePostUsageBilling, and the legacy postUsageBilling fallback to ActualCost, and add a table-driven test covering 2x / 0.5x / free multipliers plus a balance-mode regression check.