APIの使い方がわかりません。

###このAPIの使い方がわかりません。
https://github.com/ReiKohaku/BotArcApi_lib

具体的には、Usage の Create API の章の2番、「Make sure you deploy the domain name of BotArcApi, such as http://localhost:8088.」について、これが何を意味しているのかわかりませんでした。

このAPIは、オンラインゲームのスコアを取得し、それをプログラム上で扱えるようにしてくれるものです。

###試したこと
試しにhttp://localhost:8088について無視してUseApiの章のサンプルを実行してみたところ、エラーが出ました。

実行したコード

js
1'use strict';
2
3const { BotArcApiV4 } = require("botarcapi_lib");
4const api = new BotArcApiV4("http://localhost:8088", 60000)
5
6api.user.best30("Nagiha0798", true)
7    .then(console.log)
8    .catch(console.error);

エラー

Error: connect ECONNREFUSED 127.0.0.1:8088
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1146:16) {
  errno: -4078,
  code: 'ECONNREFUSED',
  syscall: 'connect',
  address: '127.0.0.1',
  port: 8088,
  config: {
    url: 'v4/user/best30',
    method: 'get',
    headers: {
      Accept: 'application/json, text/plain, */*',
      'User-Agent': 'axios/0.21.1'
    },
    params: { user: 'Nagiha0798' },
    baseURL: 'http://localhost:8088',
    transformRequest: [ [Function: transformRequest] ],
    transformResponse: [ [Function: transformResponse] ],
    timeout: 60000,
    adapter: [Function: httpAdapter],
    xsrfCookieName: 'XSRF-TOKEN',
    xsrfHeaderName: 'X-XSRF-TOKEN',
    maxContentLength: -1,
    maxBodyLength: -1,
    validateStatus: [Function: validateStatus],
    data: undefined
  },
  request: <ref *1> Writable {
    _writableState: WritableState {
      objectMode: false,
      highWaterMark: 16384,
      finalCalled: false,
      needDrain: false,
      ending: false,
      ended: false,
      finished: false,
      destroyed: false,
      decodeStrings: true,
      defaultEncoding: 'utf8',
      length: 0,
      writing: false,
      corked: 0,
      sync: true,
      bufferProcessing: false,
      onwrite: [Function: bound onwrite],
      writecb: null,
      writelen: 0,
      afterWriteTickInfo: null,
      buffered: [],
      bufferedIndex: 0,
      allBuffers: true,
      allNoop: true,
      pendingcb: 0,
      prefinished: false,
      errorEmitted: false,
      emitClose: true,
      autoDestroy: true,
      errored: null,
      closed: false
    },
    _events: [Object: null prototype] {
      response: [Array],
      error: [Function: handleRequestError],
      socket: [Function: destroyOnTimeout]
    },
    _eventsCount: 3,
    _maxListeners: undefined,
    _options: {
      maxRedirects: 21,
      maxBodyLength: 10485760,
      protocol: 'http:',
      path: '/v4/user/best30?user=Nagiha0798',
      method: 'GET',
      headers: [Object],
      agent: undefined,
      agents: [Object],
      auth: undefined,
      hostname: 'localhost',
      port: '8088',
      nativeProtocols: [Object],
      pathname: '/v4/user/best30',
      search: '?user=Nagiha0798'
    },
    _ended: true,
    _ending: true,
    _redirectCount: 0,
    _redirects: [],
    _requestBodyLength: 0,
    _requestBodyBuffers: [],
    _onNativeResponse: [Function (anonymous)],
    _currentRequest: ClientRequest {
      _events: [Object: null prototype],
      _eventsCount: 7,
      _maxListeners: undefined,
      outputData: [],
      outputSize: 0,
      writable: true,
      destroyed: false,
      _last: true,
      chunkedEncoding: false,
      shouldKeepAlive: false,
      _defaultKeepAlive: true,
      useChunkedEncodingByDefault: false,
      sendDate: false,
      _removedConnection: false,
      _removedContLen: false,
      _removedTE: false,
      _contentLength: 0,
      _hasBody: true,
      _trailer: '',
      finished: true,
      _headerSent: true,
      socket: [Socket],
      _header: 'GET /v4/user/best30?user=Nagiha0798 HTTP/1.1\r\n' +
        'Accept: application/json, text/plain, */*\r\n' +
        'User-Agent: axios/0.21.1\r\n' +
        'Host: localhost:8088\r\n' +
        'Connection: close\r\n' +
        '\r\n',
      _keepAliveTimeout: 0,
      _onPendingData: [Function: noopPendingOutput],
      agent: [Agent],
      socketPath: undefined,
      method: 'GET',
      maxHeaderSize: undefined,
      insecureHTTPParser: undefined,
      path: '/v4/user/best30?user=Nagiha0798',
      _ended: false,
      res: null,
      aborted: false,
      timeoutCb: null,
      upgradeOrConnect: false,
      parser: null,
      maxHeadersCount: null,
      reusedSocket: false,
      host: 'localhost',
      protocol: 'http:',
      _redirectable: [Circular *1],
      [Symbol(kCapture)]: false,
      [Symbol(kNeedDrain)]: false,
      [Symbol(corked)]: 0,
      [Symbol(kOutHeaders)]: [Object: null prototype]
    },
    _currentUrl: 'http://localhost:8088/v4/user/best30?user=Nagiha0798',
    _timeout: Timeout {
      _idleTimeout: -1,
      _idlePrev: null,
      _idleNext: null,
      _idleStart: 62,
      _onTimeout: null,
      _timerArgs: undefined,
      _repeat: null,
      _destroyed: true,
      [Symbol(refed)]: true,
      [Symbol(kHasPrimitive)]: false,
      [Symbol(asyncId)]: 9,
      [Symbol(triggerId)]: 5
    },
    [Symbol(kCapture)]: false
  },
  response: undefined,
  isAxiosError: true,
  toJSON: [Function: toJSON]
}