import { IPaymentGateway, PaymentParams, PaymentResult, VerifyParams, RefundParams, SubscriptionResult, InvoiceResult, WalletResult } from '../types/gateway';
/**
 * Paystack payment gateway implementation (real)
 */
export declare class PaystackGateway implements IPaymentGateway {
    private config;
    private paystack;
    constructor(config: {
        secretKey: string;
    });
    /**
     * Initiate a payment (initialize transaction)
     */
    pay(params: PaymentParams): Promise<PaymentResult>;
    /**
     * Verify a payment
     */
    verify(params: VerifyParams): Promise<PaymentResult>;
    /**
     * Refund a payment
     */
    refund(params: RefundParams): Promise<PaymentResult>;
    /**
     * Create a subscription (not implemented)
     */
    subscribe(_params?: Record<string, unknown>): Promise<SubscriptionResult>;
    /**
     * Create an invoice (not implemented)
     */
    createInvoice(_params?: Record<string, unknown>): Promise<InvoiceResult>;
    /**
     * Wallet operations (not supported)
     */
    wallet(_params?: Record<string, unknown>): Promise<WalletResult>;
}