/**
 * Generate PDF filename for invoice
 * @param invoice - The invoice object
 * @returns The formatted PDF filename
 */
export declare const generateInvoicePDFName: (invoice: {
    invoice_number: string;
}) => string;
/**
 * Check if invoice can be paid online
 * @param status - Invoice status
 * @returns Whether pay online should be available
 */
export declare const canPayOnline: (status: string) => boolean;