import Payment from '../../payment';
import AbstractPaymentsDatabase from '../AbstractPaymentsDatabase';
import EngineNedb from './EngineNedb';
import ChannelId from '../../ChannelId';
export default class NedbPaymentsDatabase extends AbstractPaymentsDatabase<EngineNedb> {
    save(token: string, payment: Payment): Promise<void>;
    /**
     * Find a payment with maximum value on it inside the channel.
     */
    firstMaximum(channelId: ChannelId | string): Promise<Payment | null>;
    /**
     * Find a payment by token.
     */
    findByToken(token: string): Promise<Payment | null>;
}