import { KhaltiConfig, KhaltiPaymentOptions, KhaltiPaymentResponse, KhaltiVerificationOptions, PaymentVerificationResponse } from '../types/payment.types';
/**
 * Khalti payment gateway implementation
 */
export declare class KhaltiGateway {
    private readonly config;
    private readonly baseUrl;
    /**
     * Create a new Khalti gateway instance
     * @param config Khalti configuration
     */
    constructor(config: KhaltiConfig);
    /**
     * Validate payment options
     * @private
     */
    private validatePaymentOptions;
    /**
     * Create a new payment
     * @param options Payment options
     * @returns Payment response with payment URL and ID
     */
    createPayment(options: KhaltiPaymentOptions): Promise<KhaltiPaymentResponse>;
    /**
     * Verify a payment
     * @param options Verification options
     * @returns Payment verification response
     */
    verifyPayment(options: KhaltiVerificationOptions): Promise<PaymentVerificationResponse>;
}