/**
 * QuickBooks Online API Client with retry logic and error handling
 */
import { QBOConfig } from '../types';
/**
 * QuickBooks Online API Client
 */
export declare class QBOApiClient {
    private axiosInstance;
    private tokens;
    private readonly baseUrl;
    private readonly authUrl;
    private readonly qboConfig;
    private tokenRefreshPromise?;
    constructor(qboConfig?: QBOConfig);
    /**
     * Ensure we have a valid access token
     */
    private ensureValidToken;
    /**
     * Refresh the OAuth2 access token
     */
    private refreshAccessToken;
    /**
     * Make a GET request to QuickBooks API
     */
    get<T = any>(endpoint: string, params?: any): Promise<T>;
    /**
     * Make a POST request to QuickBooks API
     */
    post<T = any>(endpoint: string, data: any): Promise<T>;
    /**
     * Make a PUT request to QuickBooks API
     */
    put<T = any>(endpoint: string, data: any): Promise<T>;
    /**
     * Make a DELETE request to QuickBooks API
     */
    delete<T = any>(endpoint: string): Promise<T>;
    /**
     * Execute a query using QuickBooks Query Language
     */
    query<T = any>(query: string): Promise<T>;
    /**
     * Send an email for an entity (invoice, estimate, etc.)
     */
    sendEmail(entityType: string, entityId: string, email?: string): Promise<any>;
    /**
     * Download a PDF for an entity
     */
    downloadPDF(entityType: string, entityId: string): Promise<Buffer>;
    /**
     * Get company info
     */
    getCompanyInfo(): Promise<any>;
    /**
     * Get current user info
     */
    getCurrentUser(): Promise<any>;
    /**
     * Batch operations
     */
    batch(operations: Array<{
        bId: string;
        operation: 'create' | 'update' | 'query' | 'delete';
        entity?: string;
        data?: any;
        query?: string;
    }>): Promise<any>;
    /**
     * Get API limits and usage
     */
    getApiLimits(): Promise<{
        remaining: number;
        limit: number;
        reset: Date;
    }>;
}
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