Refunds

import { amount } from '@crapthings/money-safe';

export function calculateRefund(paidMinor: number, refundDecimal: string) {
  const paid = amount.minor(paidMinor, 'CNY');
  const refund = amount(refundDecimal, 'CNY');
  const remaining = paid.minus(refund);

  return {
    paid: paid.toDecimal(),
    refund: refund.toDecimal(),
    remaining: remaining.toDecimal(),
    auditPayload: refund.toJSON()
  };
}

The audit payload includes amountMinor, currency, and minorUnit.