CODE EXAMPLE FOR JAVASCRIPT

return axios response from seperate file

import axios from 'axios';

export const onAuthenticate = payload => {
  const URL = `YOUR_URL`;
  return axios(URL, {
    method: 'POST/GET',
    headers: {
      'content-type': 'application/json', // whatever you want
    },
    data: payload,
  })
    .then(response => response.data)
    .catch(error => {
      throw error;
    });
};
in you App.js

import * as AuthenticateAPI from 'api/AuthenticationAPI';

 // in your CDM
 componentDidMount(){
  AuthenticateAPI.onAuthenticate(payload).then((res)=>{ //any payload you want to send just for example
    you can get response here in then block
 }) 
 }