How do I get the current user’s id in this Laravel 8 and Auth0 API?

I am working on a Laravel 8 API. I use Auth0 for user registration and login.

At registration, I need the user’s id returned by Auth0 (as user_id), in order to insert it into my own users table, in a column called uid.

Also, once a user is logged in, I need to display the user’s data at myapp.test/api/user-profile/show/ for which, also, I need the user_id.

For this purpose I have the code:

In routesapi.php:

Route::get('/authorization', [UserController::class, 'authorize']);

In the UserController:

public function authorize(){

    $appDomain = 'https://' . config('laravel-auth0.domain');
    $appClientId = config('laravel-auth0.client_id');
    $appClientSecret = config('laravel-auth0.client_secret');
    $appAudience = config('laravel-auth0.api_identifier');

    $curl = curl_init();

    curl_setopt_array($curl, array(
        CURLOPT_URL => "$appDomain/oauth/token",
        CURLOPT_RETURNTRANSFER => true,
        CURLOPT_ENCODING => "",
        CURLOPT_MAXREDIRS => 10,
        CURLOPT_TIMEOUT => 30,
        CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
        CURLOPT_CUSTOMREQUEST => "POST",
        CURLOPT_POSTFIELDS => "{"client_id":"$appClientId","client_secret":"$appClientSecret","audience":"$appAudience","grant_type":"client_credentials"}",
        CURLOPT_HTTPHEADER => array(
            "content-type: application/json"
        ),
    ));

    $response = curl_exec($curl);
    $err = curl_error($curl);

    curl_close($curl);

    if ($err) {
        return "cURL Error #:" . $err;
    } else {
        return $response;
    }
}

The problem

The authorize() method (taken from a tutorial on the Auth0 website), only returns the access_token info but not the user_id.

Questions

1. How do I get the current user’s user_id?
2. I suppose I need to replace CURLOPT_URL => "$appDomain/oauth/token" with something, not with what?

Answer

Please look at this community answer:

https://community.auth0.com/t/how-to-get-user-information-from-the-laravel-api-side/47021/3

Make a request to the Authentication API’s userinfo endpoint to get the user’s profile. https://auth0.com/docs/api/authentication#user-profile