/**
 * SMS inbound: parse a Twilio webhook form → ShuttleMessage, and validate the
 * Twilio request signature. Both pure and fully testable (no live network).
 *
 * A Twilio inbound webhook is `application/x-www-form-urlencoded` with fields
 * like From, To, Body, MessageSid. Every phone number is its own DM thread.
 */
import type { ShuttleMessage } from '../adapter.js';
export declare function parseTwilioForm(params: Record<string, string>): ShuttleMessage | null;
/**
 * Validate a Twilio webhook signature (`X-Twilio-Signature`).
 * Twilio signs: the full request URL + each POST param (sorted by key,
 * concatenated key+value), HMAC-SHA1 with the auth token, base64.
 */
export declare function validateTwilioSignature(authToken: string, fullUrl: string, params: Record<string, string>, signature: string): boolean;
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