贝宝认证失败和未经授权的错误

Question

我已将所有有效凭证输入到Paypal帐户，但仍然出现401未经授权错误。有解决方案吗？请参阅下面的图片以供参考。

这是贝宝按钮的代码

import React from 'react';
import PaypalExpressBtn from 'react-paypal-express-checkout';

export default class MyApp extends React.Component {
    render() {
        const onSuccess = (payment) => {
            // Congratulation, it came here means everything's fine!
                    console.log("The payment was succeeded!", payment);

                    this.props.clearCart();
                    this.props.history.push('/');
                    // You can bind the "payment" object's value to your state or props or whatever here, please see below for sample returned data
        }

        const onCancel = (data) => {
            // User pressed "cancel" or close Paypal's popup!
            console.log('The payment was cancelled!', data);
            // You can bind the "data" object's value to your state or props or whatever here, please see below for sample returned data
        }

        const onError = (err) => {
            // The main Paypal's script cannot be loaded or somethings block the loading of that script!
            console.log("Error!", err);
            // Because the Paypal's main script is loaded asynchronously from "https://www.paypalobjects.com/api/checkout.js"
            // => sometimes it may take about 0.5 second for everything to get set, or for the button to appear
        }

        let env = 'sandbox'; // you can set here to 'production' for production
        let currency = 'USD'; // or you can set this value from your props or state
        // let total = 1; // same as above, this is the total amount (based on currency) to be paid by using Paypal express checkout
        // Document on Paypal's currency code: https://developer.paypal.com/docs/classic/api/currency_codes/

        const client = {
            sandbox:    "sandbox api",
            production: 'YOUR-PRODUCTION-APP-ID',
        }
        // In order to get production's app-ID, you will have to send your app to Paypal for approval first
        // For sandbox app-ID (after logging into your developer account, please locate the "REST API apps" section, click "Create App"):
        //   => https://developer.paypal.com/docs/classic/lifecycle/sb_credentials/
        // For production app-ID:
        //   => https://developer.paypal.com/docs/classic/lifecycle/goingLive/

        // NB. You can also have many Paypal express checkout buttons on page, just pass in the correct amount and they will work!
        return (
            <PaypalExpressBtn 
            env={env} 
            client={client} 
            currency={currency} 
            total={this.props.total} 
            onError={onError} 
            onSuccess={onSuccess} 
            onCancel={onCancel} />
        );
    }
}

我已使用正确的凭据登录，但仍然抛出此错误