Function computeCharge

  • computeCharge(amount, periodCredits, packs, now, overdraftLimit?): node.common.apis.billing.ChargeResult | null

  • Computes a credit charge with pack expiry, FIFO consumption, and overdraft check.

    • Filters expired packs
    • Deducts from period credits first
    • Then consumes packs FIFO (earliest expiry first)
    • Removes fully consumed packs
    • Returns null if charge would exceed overdraft limit

    Pure function — no side effects.

    Parameters

    Returns node.common.apis.billing.ChargeResult | null

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