client.js

import axios from 'axios';

export default axios.create({
  baseURL: 'https://api.expertlead.de/v.1.0/',
  timeout: 1000,
  headers: {
    'token': '<YOUR_TOKEN>'
  }
});

component.js

import useService from 'service';

export default () => {
  const [fetch] = useService();

  return (
    <div>
      <button onClick={fetch}>Fetch data</button>
    </div>
  );
};

service.js

import client from 'client';

export default () => client.get('/some-endpoint');