import type { PaywallConfig, GenericRequest, GenericResponse } from './types.js';
export type NextFunction = () => void | Promise<void>;
/**
 * Framework-agnostic paywall middleware supporting x402 and MPP protocols.
 *
 * Accepts credentials from either protocol regardless of the `protocol` config.
 * The `protocol` setting controls which challenge format(s) are advertised in
 * the 402 response.
 */
export declare function createPaywall(config: PaywallConfig): (req: GenericRequest, res: GenericResponse, next: NextFunction) => Promise<void>;
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