import AlipaySdk, { AlipaySdkCommonResult } from 'alipay-sdk/lib/alipay';
import { PaymentMethod } from './payment.entities';
export declare class PaymentAlipayHelper {
    static sdk(): Promise<AlipaySdk>;
    static authToken(): Promise<AlipaySdkCommonResult | string>;
    static createPaymentOrder(method: PaymentMethod, goods: {
        cost: number;
        name: string;
        packParams: object;
    }, { returnUrl, isMobile }: {
        returnUrl?: string;
        isMobile?: boolean;
    }): Promise<AlipaySdkCommonResult | string>;
    static validateSign(postData: object): Promise<boolean>;
}