plugins – WordPress: Person registration – verify mail if it exists in exterior api

My JSON file

{  "objects": [
{
  "secuencial_persona": 00001,
  "identificacion": "xxxxxxxx",
  "nombre_persona": "xxxxxxxxxxxxxxxxxx",
  "perfil": "USUARIO",
  "estado": "ACTIVO",
  "email": "xxxxxxxxxx@outlook.com"
},
{
  "secuencial_persona": 11126,
  "identificacion": "dddddddddddd",
  "nombre_persona": "ddddddddddddddddddddddd",
  "perfil": "USUARIO",
  "estado": "ACTIVO",
  "email": "dddddddddd@hotmail.es"
},
{

Plugin WordPress

if (!is_admin()) {
                //activate only when post email
                if (isset($_POST['email']) || isset($_POST['user_email'])) {
                    add_filter('is_email', array($this, 'isEmail'), 11, 2);
                    add_filter('registration_errors', array($this, 'CTH_email_validator_wprg'), 1, 3);
                    add_filter('user_profile_update_errors', array($this, 'availableError'));
                    add_filter('login_errors', array($this, 'availableError'));
                }
            }

I’m base on a plugin that makes a e mail validation to an exterior api. When registering or writing the e-mail, a perform that makes a request to an API with the e-mail and confirm that it exists, if it exists it allows you to register but when it doesn’t exist you can’t register.

public perform CTH_email_check($e mail)
    {
        if (is_admin()) {
            // If consumer have logged as admin, which means likely they're modifying the settings, let it go if is_email been known as.
            return true;
        }

        if (($_SERVER['REQUEST_URI'] == '/wp-login.php') | ($_SERVER['REQUEST_URI'] == '/wp-login.php?loggedout=true') | ($_SERVER['REQUEST_URI'] == '/wp-cron.php')) {
            // if wp-login.php is been known as for login to dashboard, skip the verify.
            return true;
        }

        // Test the formatting is appropriate
        if (filter_var($e mail, FILTER_VALIDATE_EMAIL) === false) {
            return false;
        }
        $flag = false;
        //For testing i used a json file
        $response = plugin_dir_url(__FILE__) . "belongings/usuarios.json";
        //$response = wp_remote_get("http://url" . $e mail);
        
        $response_data = json_decode($response);
        $physique  = @json_decode($response_data);
        $email_data = $body->objects;

        // Traverse array and show consumer knowledge
        foreach ($email_data as $consumer) {
            if ($user->e mail == $e mail) {
                $flag = true;
                break;
            }
        }
    }

Sadly I do not know if I am heading in the right direction and it might assist me so much for those who can information me.