import { EventBus } from "./eventBus";
export declare class CheckoutPageData {
    shopify_checkout_token: string;
    shopify_checkout_authorization_token?: string;
}
export declare class CheckoutPageError {
    errorMessage: string;
}
export declare class Checkout {
    static instance: Checkout;
    private eventBus;
    private getCheckoutPagePromise;
    private shopify_checkout_token;
    private shopify_checkout_authorization_token;
    private constructor();
    static getInstance(): Checkout;
    setEventBus(eventBus: EventBus): this;
    getEventBus(): EventBus;
    private getCheckoutPageError;
    getCheckoutPage(): Promise<[CheckoutPageData, CheckoutPageError]>;
    putDiscountCode(discount_code: string): Promise<[any, string]>;
}