This will be the SDK for the Universe API. So that you won't stress yourself with too much details. The second file will be in the config folder. Forget about the third code for now

1. Universe.php

<?php

namespace App\Integrations;

use App\Models\User;
use Illuminate\Support\Facades\Http;

class Universe
{
    protected $apiKey;
    protected $baseUrl;
    protected $authToken;
    protected $userEmail;
  
    public function __construct() {
      $this->initialize(); 
    }

    public function initialize() {
        // Get the current
        $this->apiKey = config('universe.apiKey');
        $this->baseUrl = config('universe.baseUrl');
        $this->userEmail = config('universe.userEmail');

        // Login to Universe API to get the auth token
        $this->authToken = $this->authenticate();
    }

    public function getCountries() {
        $url = $this->baseUrl . '/countries';

        $response = Http::withHeaders([
                        'Authorization' => 'Bearer ' . $this->authToken,
                        'Accept' => 'application/json',
                    ])->get($url)->json();

        return $response;
    }
  
    public function getStates(String $country) {
        $url = $this->baseUrl . '/states/' . $country;

        $response = Http::withHeaders([
                        'Authorization' => 'Bearer ' . $this->authToken,
                        'Accept' => 'application/json',
                    ])->get($url)->json();

        return $response;
    }

    protected function authenticate() {
        // Get the auth token from cache
        // $authToken = Cache::get('authToken');
        
        $url = $this->baseUrl . '/getaccesstoken';

        $response = Http::withHeaders([
                        'Accept' => 'application/json',
                        'api-token' => $this->apiKey,
                        'user-email' => $this->userEmail
                    ])->get($url)->json();

        return $response['auth_token'];
    }
}

2. universe.php

<?php

return [
  
  'apiKey' => env('UNIVERSE_API_KEY'),
  'baseUrl' => env('UNIVERSE_BASE_URL'),
  'userEmail' => env('UNIVERSE_USER_EMAIL'),
  
];

3. create_cache_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateCacheTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('cache', function($table) {
            $table->string('key')->unique();
            $table->text('value');
            $table->integer('expiration');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('cache');
    }
}