export declare const KSEF_KEYS: {
    demo: string;
    test: string;
    prod: string;
};
export declare class KsefHelpers {
    static encryptToken(authToken: string, publicKeyPem: string): string;
    static parsePem(pem: string): string;
    static signRequest(xml: string, privateKey: string, certificate: string, rootElementName?: string, passphrase?: string): string;
    static parseInvoiceXml(xml: string): Promise<any>;
}