My custom persistence not working.

My custom persistence not working.

Hello,

I have followed the documentation to implement my own custom persistence class but it's not saving the access token in the database.

the class path is as the following:
file: App\Crm\ZohoCRM\MyZohoOAuth.php
class name: MyZohoOAuth

my configration array

  1.  $configuration = [

                    'client_id' => env('ZOHO_CLIENT_ID'),

                    'client_secret' => env('ZOHO_CLINET_SECRET'),

                    'redirect_uri' => env('ZOHO_REDIRECT_URI'),

                    'currentUserEmail' => env('ZOHO_EMAIL'),

                    'db_port' => env('DB_PORT'),

                    'db_username' => env('DB_USERNAME_ZOHO'),

                    'db_password' => env('DB_PASSWORD_ZOHO'),

                    'token_persistence_path' => '',

                    'persistence_handler_class' => '\App\Crm\ZohoCRM\MyZohoOAuth.php',

                    'persistence_handler_class_name' => 'MyZohoOAuth'

                ];