export type Billing = {
    mId: string;
    customerKey: string;
    authenticatedAt: string;
    method: '카드';
    billingKey: string;
    card: {
        issuerCode: string;
        acquirerCode: string;
        number: string;
        cardType: '신용' | '체크' | '기프트';
        ownerType: '개인' | '법인';
    };
};