import type { IOTPValue, IDeliveryAgent } from 'totem-otp';
export interface WebhookDeliveryAgentOptions {
    /**
     * Webhook destination URL
     */
    webhookUrl: string;
    /**
     * Optional callback function to compute the request body
     * If not provided, a default body structure will be used
     */
    bodyBuilder?: (otp: IOTPValue) => Record<string, any> | string;
    /**
     * Optional HTTP headers to include in the request
     * @default { 'Content-Type': 'application/json' }
     */
    headers?: Record<string, string>;
    /**
     * Optional HTTP method
     * @default 'POST'
     */
    method?: 'POST' | 'PUT' | 'PATCH';
    /**
     * Optional timeout in milliseconds
     * @default 30000 (30 seconds)
     */
    timeout?: number;
}
export declare class WebhookDeliveryAgent implements IDeliveryAgent {
    private readonly webhookUrl;
    private readonly bodyBuilder;
    private readonly headers;
    private readonly method;
    private readonly timeout;
    constructor(options: WebhookDeliveryAgentOptions);
    sendMessageToAudience(otp: IOTPValue): Promise<string>;
    /**
     * Default body builder that creates a standard webhook payload
     */
    private defaultBodyBuilder;
    /**
     * Make HTTP request using Node.js built-in modules
     */
    private makeHttpRequest;
    /**
     * Extract receipt ID from webhook response
     */
    private extractReceiptId;
    /**
     * Generate a fallback receipt ID if none is provided by the webhook
     */
    private generateReceiptId;
    /**
     * Simple hash function for generating receipt IDs
     */
    private simpleHash;
}