interface CryptoPaymentsConfig {
    /**
     * ID of the terminal
     */
    terminalId: string;
    /**
     * Auth-key
     */
    auth: string;
    /**
     * Adding this instead of amount and fromCurrency directs to specific payments request
     */
    paymentId?: string;
    /**
     * Payment amount (not valid if paymentId is added)
     */
    amount?: number;
    /**
     * Currency (abbriviation e.g. EUR, USD, CHF) (not valid if paymentId is added)
     */
    fromCurrency?: string;
    /**
     * Platform specific callback (avoid querstrings in URL)
     */
    paymentCallbackUrl?: string;
    /**
     * 'en' (default), 'de', 'fr', 'it'
     */
    language?: 'en' | 'de' | 'fr' | 'it';
    /**
     * Append target HTMLElement
     */
    target?: HTMLElement | null;
    /**
     * Adds a reference note to the payment request
     */
    referenceId?: string;
}
export declare class CryptoPayments {
    private frame;
    private config;
    private data;
    private promise;
    private resolver;
    private rejecter;
    private endpointUrl;
    constructor(config: CryptoPaymentsConfig);
    private validateConfig;
    private createIframe;
    private createUrl;
    create(): Promise<any>;
    private resolve;
    private reject;
    onMessageFromSandbox(event: {
        data: string;
    }): void;
    static style: string;
    static styleDisabled: string;
}
export {};