/**
 * WhatsApp Cloud inbound: parse Meta's webhook → ShuttleMessages, verify the
 * request signature, and handle the GET verification handshake. All pure/testable.
 */
import type { ShuttleMessage } from '../adapter.js';
export interface WhatsAppWebhookBody {
    readonly object?: string;
    readonly entry?: ReadonlyArray<{
        readonly changes?: ReadonlyArray<{
            readonly value?: {
                readonly messaging_product?: string;
                readonly metadata?: {
                    readonly phone_number_id?: string;
                };
                readonly messages?: ReadonlyArray<{
                    readonly from?: string;
                    readonly id?: string;
                    readonly type?: string;
                    readonly text?: {
                        readonly body?: string;
                    };
                }>;
                readonly statuses?: ReadonlyArray<{
                    readonly id?: string;
                    readonly status?: string;
                    readonly timestamp?: string;
                    readonly errors?: ReadonlyArray<{
                        readonly code?: number;
                        readonly title?: string;
                    }>;
                }>;
            };
            readonly field?: string;
        }>;
    }>;
}
/** Extract text messages (ignores statuses, non-text). Every number = its own DM. */
export declare function parseWhatsAppWebhook(body: WhatsAppWebhookBody): ShuttleMessage[];
/** Verify `X-Hub-Signature-256` = `sha256=` + HMAC-SHA256(appSecret, rawBody). */
export declare function verifyWhatsAppSignature(appSecret: string, rawBody: string, signatureHeader: string): boolean;
/** GET webhook verification: echo `hub.challenge` when the token matches, else null. */
export declare function verifyWebhookChallenge(params: {
    readonly 'hub.mode'?: string;
    readonly 'hub.verify_token'?: string;
    readonly 'hub.challenge'?: string;
}, verifyToken: string): string | null;
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