google analytics API implementation for tracking a specific user activities in php

I'm developing an e-commerce student project using php (laravel framework), I have found lots of tutorials about using google analytics, but very rarely about how to retrieve data to my web site using APIs. I have the following questions: (1) how to retrieve all data from google analytics to my web site using API. (2) how to retrieve all data of UserID view? because I want to get all data about a specific user to know what is he/she (browser, language, country, Os .... etc) to use it to personalize my web site.

please any idea or help will be appreciated, I'm run out of time, people help

below is my API code that I'm using :

<?php
    namespace App\Http\Controllers;
    use Illuminate\Http\Request;
    use App\Http\Controllers\Controller;


    class HomeController extends Controller
    {
       public function getAnalyticsSummary(Request $request){
            $from_date = date("Y-m-d", strtotime($request->get('from_date',"7 days ago")));
            $to_date = date("Y-m-d",strtotime($request->get('to_date',$request->get('from_date','today')))) ; 
            $gAData = $this->gASummary($from_date,$to_date) ;
            return $gAData;
        }
             //to get the summary of google analytics.
        private function gASummary($date_from,$date_to) {
            $service_account_email = 'get-data-analytics@analytics-api-project-148820.iam.gserviceaccount.com';       
            // Create and configure a new client object.
            $client = new \Google_Client();
            $client->setApplicationName("any name");
            $analytics = new \Google_Service_Analytics($client);
            $cred = new \Google_Auth_AssertionCredentials(
                $service_account_email,
                array(\Google_Service_Analytics::ANALYTICS_READONLY),
                  "-----BEGIN PRIVATE KEY-----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\nCar/=========================================================================================================================================================================================================================================x/NCNpGaW7zKvAoGAffG7PqgXYNtqQ3MavgLF\nKtQFMzT65kI5AfXPpyzgBDKr84lhvdUddvK/FZg/mIuoLRLSgnYPnAv3s5yhleZ5\n7LGyo5fXXH7XUm2nNt+XZoV1rt6y+WgZi103M+fuv3GXYBdbOonPHopRzw3uzLIA\n9ovyAV95jOu9ybk4YgQXm5I=\n-----END PRIVATE KEY-----\n"
            );     
            $client->setAssertionCredentials($cred);
            if($client->getAuth()->isAccessTokenExpired()) {
                $client->getAuth()->refreshTokenWithAssertion($cred);
            }

            $optParams = [
                'dimensions' => 'ga:date',
                'sort'=>'-ga:date'
            ] ; 

            $results = $analytics->data_ga->get(
               'ga:133119102', 
               $date_from,
               $date_to,
               /*'ga:sessions,ga:users,ga:pageviews,ga:bounceRate,ga:hits,ga:avgSessionDuration',*/
               'ga:bounceRate',
               $optParams
               );

                $rows = $results->getRows();
                $rows_re_align = [] ;
                foreach($rows as $key=>$row) {
                    foreach($row as $k=>$d) {
                        $rows_re_align[$k][$key] = $d ;
                    }
                }           
                $optParams = array(
                            'dimensions' => 'rt:medium'
                    );



                try {
                  $results1 = $analytics->data_realtime->get(
                      'ga:132964552',
                      'rt:activeUsers',
                      $optParams);
                  // Success. 
                } catch (apiServiceException $e) {
                  // Handle API service exceptions.
                  $error = $e->getMessage();
                }

                $active_users = $results1->totalsForAllResults ;



                return view('myGoogle.getGoogle', [

                    'data'=> $rows_re_align ,
                   /* 'summary'=>$results->getTotalsForAllResults(),*/
                   /* 'active_users'=>$active_users['rt:activeUsers']*/
                    ]) ;
        }
    }

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