import { CollectCheckoutParam } from '../model';
export declare class CollectCheckoutService {
    private clientConfiguration;
    private readonly hostUrl;
    private readonly hostKey;
    private readonly collectAppID;
    private readonly collectAppLoader;
    private readonly collectAppWidget;
    private readonly _handleMessageAddEventListener;
    constructor(clientConfiguration: CollectCheckoutParam);
    /**
     * Setup collect checkout
     */
    setup(): void;
    /**
     * Open collect checkout
     */
    open(): void;
    /**
     * Close collect checkout
     */
    close(): Promise<void>;
    private handleMessageAddEventListener;
    private validateConfiguration;
}