/**
 * Invoice service for QuickBooks operations
 */
import { QBOApiClient } from '../api/client';
import { QBOInvoice, InvoiceListResponse } from '../types';
export declare class InvoiceService {
    private api;
    constructor(api: QBOApiClient);
    /**
     * Get invoices with filtering
     */
    getInvoices(params: any): Promise<InvoiceListResponse>;
    /**
     * Create a new invoice
     */
    createInvoice(params: any): Promise<QBOInvoice>;
    /**
     * Send invoice via email
     */
    sendInvoice(params: any): Promise<void>;
    /**
     * Get invoice by ID
     */
    getInvoiceById(invoiceId: string): Promise<QBOInvoice>;
    /**
     * Update an invoice
     */
    updateInvoice(invoiceId: string, updates: Partial<QBOInvoice>): Promise<QBOInvoice>;
    /**
     * Delete an invoice
     */
    deleteInvoice(invoiceId: string): Promise<void>;
    /**
     * Get invoice PDF
     */
    getInvoicePDF(invoiceId: string): Promise<Buffer>;
    /**
     * Find customer by name
     */
    private findCustomerByName;
    /**
     * Format invoice list for response
     */
    private formatInvoiceList;
    /**
     * Determine invoice status
     */
    private getInvoiceStatus;
    /**
     * Get aging report for invoices
     */
    getAgingReport(): Promise<any>;
}
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