Integrate custom API authentication in Laravel

I consume this api like this in the controller

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class ApiController extends Controller
{
    public function getToken()
    {
        $curl = curl_init();

        curl_setopt_array($curl, array(
            CURLOPT_URL => 'https://url/oauth/v2/accesstoken?grant_type=client_credentials',
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_ENCODING => '',
            CURLOPT_MAXREDIRS => 10,
            CURLOPT_TIMEOUT => 0,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
            CURLOPT_CUSTOMREQUEST => 'POST',
            CURLOPT_HTTPHEADER => array(
                'Authorization: Basic --HERE IS CODED BASE64 CREDENTIALS--',
                'Content-Type:application/json',
            ),
        ));

        $response = curl_exec($curl);
        $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);

        if ( $httpCode != 200 ){
            echo "Return code is {$httpCode} \n"
                .curl_error($curl);
        } else {
            $json = json_decode($response, true);
            return $json['access_token'];
        }
        curl_close($curl);
    }

    public function callApi(string $token)
    {
        $curl = curl_init();

        curl_setopt_array($curl, array(
          CURLOPT_URL => 'https://url/subscribers/v2/?source=XXX&licensenumber=AA123AA',
          CURLOPT_RETURNTRANSFER => true,
          CURLOPT_ENCODING => '',
          CURLOPT_MAXREDIRS => 10,
          CURLOPT_TIMEOUT => 0,
          CURLOPT_FOLLOWLOCATION => true,
          CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
          CURLOPT_CUSTOMREQUEST => 'GET',
          CURLOPT_HTTPHEADER => array(
            'Authorization: Bearer '.$token
          ),
        ));
        
        $response = curl_exec($curl);
        $httpCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);

        if ( $httpCode != 200 ){
            echo "Return code is {$httpCode} \n"
                .curl_error($curl);
        } else {
            $json = json_decode($response, true);
            echo $response;
        }
        curl_close($curl);
    }

    public function check()
    {
        $token = $this->getToken();
        $this->callApi($token);
    }

}

Now I dunno how and where to call this...or i have to implement in service provider?? I dunno how to do all this. No one reply :S