BillingKeyClient: {
    getBillingKeyInfo: ((billingKey: string) => Promise<BillingKeyInfo>);
    deleteBillingKey: ((billingKey: string) => Promise<DeleteBillingKeyResponse>);
    getBillingKeyInfos: ((options?: {
        page?: PageInput;
        sort?: BillingKeySortInput;
        filter?: BillingKeyFilterInput;
    }) => Promise<GetBillingKeyInfosResponse>);
    issueBillingKey: ((options: {
        method: InstantBillingKeyPaymentMethodInput;
        channelKey?: string;
        channelGroupId?: string;
        customer?: CustomerInput;
        customData?: string;
        bypass?: object;
        noticeUrls?: string[];
    }) => Promise<IssueBillingKeyResponse>);
}

Type declaration