HttpClient.js

import store from './store'

export default class HttpClient {
  getUser() {
    const token = store.getState()
    // fetch and pass along your token
  }
}

store.js

import { combineReducers, createStore } from 'redux'
import { authReducer, userReducer, exampleReducer } from './reducers'

const reducer = combineReducers({
  auth: authReducer,
  user: userReducer,
  example: exampleReducer,
})

export default createStore(reducer)