/**
 * Webhook Manager
 *
 * Manages webhook subscriptions and deliveries
 */
import { EventEmitter } from 'events';
import { WebhookConfig, WebhookPayload, WebhookDelivery, WebhookEvent } from './types';
export interface WebhookManagerConfig {
    defaultRetryConfig?: {
        maxRetries: number;
        retryDelays: number[];
    };
    timeout?: number;
}
export declare class WebhookManager extends EventEmitter {
    private webhooks;
    private deliveries;
    private retryQueue;
    private config;
    constructor(config?: WebhookManagerConfig);
    /**
     * Register a new webhook
     */
    register(webhook: Omit<WebhookConfig, 'id' | 'createdAt' | 'updatedAt'>): string;
    /**
     * Update webhook configuration
     */
    update(id: string, updates: Partial<WebhookConfig>): void;
    /**
     * Delete a webhook
     */
    delete(id: string): void;
    /**
     * Get webhook by ID
     */
    get(id: string): WebhookConfig | undefined;
    /**
     * List all webhooks
     */
    list(): WebhookConfig[];
    /**
     * Trigger webhook delivery for an event
     */
    trigger<T = unknown>(event: WebhookEvent, data: T, metadata?: Record<string, unknown>): Promise<void>;
    /**
     * Deliver payload to a webhook
     */
    private deliver;
    /**
     * Attempt to deliver webhook
     */
    private attemptDelivery;
    /**
     * Schedule retry for failed delivery
     */
    private scheduleRetry;
    /**
     * Generate HMAC signature for webhook payload
     */
    private generateSignature;
    /**
     * Verify webhook signature
     */
    static verifySignature<T = unknown>(secret: string, payload: WebhookPayload<T>, signature: string): boolean;
    /**
     * Get delivery by ID
     */
    getDelivery(id: string): WebhookDelivery | undefined;
    /**
     * List deliveries for a webhook
     */
    listDeliveries(webhookId: string): WebhookDelivery[];
    /**
     * Clean up old deliveries
     */
    cleanup(olderThan: Date): number;
    /**
     * Shutdown manager and cancel pending retries
     */
    shutdown(): void;
}
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