import { TemplateResult } from "lit";
import { BaseElement } from '../../lib/base-element';
import { Constructor } from '../../lib/mixin/mixin-constructor';
/**
 * @attribute {boolean} include-payment-element - adds a credit card input form when the user accepts the offer
 */
export declare class OfferPaymentElementInterface {
    includePaymentElement: boolean;
    renderPaymentElement(): TemplateResult;
    validate(): Promise<{
        isValid: boolean;
        errors: string[];
    }>;
    getPaymentToken(): Promise<string | undefined>;
}
export declare const OfferPaymentMixin: <T extends Constructor<BaseElement>>(superClass: T) => Constructor<OfferPaymentElementInterface> & T;