/**
 * Encrypts a webhook URL using AES-256-GCM.
 * Requires TEAMS_WEBHOOK_ENC_KEY environment variable (base64 encoded 32-byte key).
 */
export declare function encryptWebhookUrl(url: string): string;
/**
 * Decrypts a webhook URL.
 * Expects format: iv:authTag:encrypted
 */
export declare function decryptWebhookUrl(encrypted: string): string;
//# sourceMappingURL=webhook-encryption.d.ts.map