This package provides Odnoklassniki integration for OAuth2 Client by the League.
composer require xdrew/oauth2-odnoklassniki
$provider = new xdrew\OAuth2\Client\Provider\Odnoklassniki([
'clientId' => '1234567',
'clientPublic' => 'CBAPKGGLEBACACACA',
'clientSecret' => 's0meRe4lLySEcRetC0De',
'redirectUri' => 'https://example.org/oauth-endpoint',
'scopes' => ['GET_EMAIL'], // OPTIONAL You should request access to this scope from ok.ru support to get user email
'userFields' => [''], // OPTIONAL
]);