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Setting cookie
$this->context->cookie->__set('your_cookie_name', 'your cookie value');
$this->context->cookie->write();
Getting cookie
$this->context->cookie->__get('your_cookie_name');
Check if cookie exists
$this->context->cookie->__isset('your_cookie_name');
Deleting cookie
$this->context->cookie->__unset('your_cookie_name');