尝试获取最后一封邮件中的电子邮件正文时出错，Nodejs GMAIL api

const { google } = require('googleapis');
const { OAuth2Client } = require('google-auth-library');

async function getLatestEmailBody() {
  // 创建 OAuth2Client 实例
  const oauth2Client = new OAuth2Client('YOUR_CLIENT_ID', 'YOUR_CLIENT_SECRET');

  // 设置访问令牌
  oauth2Client.setCredentials({
    access_token: 'YOUR_ACCESS_TOKEN',
    refresh_token: 'YOUR_REFRESH_TOKEN',
  });

  try {
    // 创建 GMAIL API 客户端
    const gmail = google.gmail({
      version: 'v1',
      auth: oauth2Client,
    });

    // 获取邮件列表
    const listResponse = await gmail.users.messages.list({
      userId: 'me',
      maxResults: 1, // 获取最后一封邮件
      q: 'is:inbox', // 过滤条件，可根据实际需求修改
    });

    const messageId = listResponse.data.messages[0].id;

    // 获取邮件详情
    const getResponse = await gmail.users.messages.get({
      userId: 'me',
      id: messageId,
      format: 'full',
    });

    // 提取邮件正文
    const emailBody = getResponse.data.payload.parts[0].body.data;
    const decodedEmailBody = Buffer.from(emailBody, 'base64').toString('utf-8');

    console.log(decodedEmailBody);
  } catch (error) {
    console.error('Error retrieving email body:', error);
  }
}

getLatestEmailBody();