import { EsewaConfig, EsewaPaymentOptions, EsewaPaymentResponse, EsewaVerificationOptions, PaymentVerificationResponse } from '../types/payment.types';
/**
 * eSewa payment gateway implementation
 */
export declare class EsewaGateway {
    private readonly config;
    private readonly baseUrl;
    private readonly statusCheckUrl;
    /**
     * Create a new eSewa gateway instance
     * @param config eSewa configuration
     */
    constructor(config: EsewaConfig);
    /**
     * Generate HMAC signature for the payment
     * @private
     */
    private generateSignature;
    /**
     * Create a new payment
     * @param options Payment options
     * @returns Payment response with form HTML and transaction UUID
     */
    createPayment(options: EsewaPaymentOptions): Promise<EsewaPaymentResponse>;
    /**
     * Verify a payment
     * @param options Verification options
     * @returns Payment verification response
     */
    verifyPayment(options: EsewaVerificationOptions): Promise<PaymentVerificationResponse>;
}