import type { Express } from "express";
import type { TollgateConfig } from "../config.js";
import { type McpPaymentLayer } from "./payment.js";
/**
 * Mount Streamable HTTP at /mcp and legacy SSE at /sse + /messages.
 * Shares one payment layer; creates per-session MCP servers as needed.
 */
export declare function mountMcpTransports(app: Express, config: TollgateConfig, paymentLayer?: McpPaymentLayer): Promise<McpPaymentLayer>;