import { IWebhookFunctions, INodeType, INodeTypeDescription, IWebhookResponseData } from 'n8n-workflow';
/**
 * Zalo OA Webhook Trigger Node
 *
 * Receives webhook events from Zalo Official Account and routes them
 * to 6 different output ports based on event type:
 *
 * Port 0: Text Message
 * Port 1: Image
 * Port 2: Sticker
 * Port 3: Location
 * Port 4: Interactive/Follow
 * Port 5: Others/Fallback
 */
export declare class ZaloOATrigger implements INodeType {
    description: INodeTypeDescription;
    /**
     * Webhook execution method
     *
     * Handles:
     * 1. Challenge verification (Zalo webhook verification)
     * 2. Signature verification (if enabled)
     * 3. Event routing to appropriate output port (0-5)
     */
    webhook(this: IWebhookFunctions): Promise<IWebhookResponseData>;
    /**
     * Create webhook response with data routed to specific output port
     */
    private createResponse;
}