import { Request, Response, NextFunction } from 'express';
import { PaymentMiddlewareOptions } from './types.js';
/**
 * Creates middleware that enforces BSV payment for HTTP requests.
 *
 * NOTE: This middleware should run after the authentication middleware so that `req.auth` is available.
 *
 * @param options - Configuration for the payment middleware
 * @param options.wallet - A wallet instance capable of submitting direct transactions.
 * @param options.calculateRequestPrice - A function returning the price for the request in satoshis.
 *
 * @returns Express middleware that requires payment if `calculateRequestPrice` > 0.
 */
export declare function createPaymentMiddleware(options: PaymentMiddlewareOptions): (req: Request, res: Response, next: NextFunction) => Promise<void>;
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