import type { DeliveryEvent } from "./types.js";
/**
 * Parse a Twilio SMS StatusCallback payload into normalized {@link DeliveryEvent}
 * records.
 */
export declare function parse(payload: unknown): DeliveryEvent[];
/**
 * Verify a Twilio request signature (`X-Twilio-Signature`).
 *
 * Builds the signed string as `url + sorted(key+value for each POST param)`,
 * HMAC-SHA1 with the Auth Token, then base64-compares to the header.
 *
 * @param url - Exact public URL Twilio requested (including query string).
 * @param params - Parsed form body (or `URLSearchParams`).
 * @param signature - Value of the `X-Twilio-Signature` header.
 * @param authToken - Twilio Auth Token (or API Key Secret used for validation).
 *
 * @see https://www.twilio.com/docs/usage/security#validating-requests
 */
export declare function verifySignature(url: string, params: Record<string, string> | URLSearchParams, signature: string, authToken: string): Promise<boolean>;