/**
 * Base Service
 * Shared HTTP client and common service functionality
 */
import { AxiosInstance } from 'axios';
/**
 * Base service class with shared HTTP client logic
 */
export declare class BaseService {
    protected httpClient: AxiosInstance;
    protected merchantId: string;
    protected apiKey: string;
    protected baseURL: string;
    protected debug: boolean;
    constructor(merchantId: string, apiKey: string, baseURL: string, debug?: boolean);
    /**
     * Handle API response and errors
     * @param apiCall - Async function that makes the API call
     * @param successCode - Expected success code (default: '0' for QR, '00' for transactions)
     * @returns API response data
     * @throws {PayWayError} If API call fails
     */
    protected handleRequest<T>(apiCall: () => Promise<any>, successCode?: string | string[]): Promise<T>;
    /**
     * Make POST request with form-data (for purchase endpoint)
     * @param endpoint - API endpoint
     * @param data - Request data
     * @returns Response
     */
    protected postFormData(endpoint: string, data: any): Promise<any>;
    /**
     * Get merchant ID
     */
    getMerchantId(): string;
    /**
     * Get API key (for internal use only)
     */
    protected getApiKey(): string;
    /**
     * Sanitize data for logging (remove sensitive information)
     */
    protected sanitizeData(data: any): any;
    /**
     * Log debug information
     */
    protected logDebug(message: string, data?: any): void;
}