/**
 * PayGate Client
 * Client for interacting with PayGate x402 payment protocol
 */
import { Keypair } from '@solana/web3.js';
import { PayGateClientConfig, PaymentCurrency, Product, PaymentRequirements, PricingResponse, VerifyResponse, PurchaseOptions, PurchaseResult, ContentResult, PurchaseHistoryResponse } from './types';
/**
 * Error class for PayGate-specific errors
 */
export declare class PayGateError extends Error {
    readonly statusCode: number | undefined;
    readonly code: string | undefined;
    constructor(message: string, statusCode?: number, code?: string);
}
/**
 * PayGate client for purchasing and retrieving x402-protected content
 */
export declare class PayGateClient {
    private baseUrl;
    private wallet;
    private defaultCurrency;
    private timeout;
    private http;
    private settlementAgent;
    private logger;
    constructor(config: PayGateClientConfig);
    /**
     * Initialize the client with a wallet for signing payments
     * @param wallet Optional wallet keypair (loads from env if not provided)
     */
    init(wallet?: Keypair): Promise<void>;
    /**
     * Fetch product information
     * @param productId The product ID
     * @returns Product information
     */
    fetchProduct(productId: string): Promise<Product>;
    /**
     * Get full payment requirements from x402 402 response
     * @param productId The product ID
     * @returns Payment requirements
     */
    getPaymentRequirements(productId: string): Promise<PaymentRequirements>;
    /**
     * Get pricing options for a product (USDC/ATHR)
     * @param productId The product ID
     * @returns Pricing options
     */
    getPricing(productId: string): Promise<PricingResponse>;
    /**
     * Verify payment details before purchase
     * @param productId The product ID
     * @param amount The payment amount
     * @param currency The payment currency
     * @returns Verification result
     */
    verify(productId: string, amount: string, currency?: PaymentCurrency): Promise<VerifyResponse>;
    /**
     * Purchase a product using the x402 flow
     * @param productId The product ID
     * @param options Purchase options
     * @returns Purchase result with transaction hash and delivery URL
     */
    purchase(productId: string, options?: PurchaseOptions): Promise<PurchaseResult>;
    /**
     * Get content for a purchased product
     * @param productId The product ID
     * @returns Content delivery result
     */
    getContent(productId: string): Promise<ContentResult>;
    /**
     * Get purchase history for the current wallet
     * @returns Purchase history
     */
    getPurchaseHistory(): Promise<PurchaseHistoryResponse>;
    /**
     * Check if the current wallet has already purchased a product
     * @param productId The product ID
     * @returns True if already purchased
     */
    hasPurchased(productId: string): Promise<boolean>;
    /**
     * Get the current wallet public key
     * @returns Wallet public key as base58 string, or undefined if not initialized
     */
    getWalletAddress(): string | undefined;
    /**
     * Handle and log errors consistently
     */
    private handleError;
}
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