private function isValid()
{
$fileField = $this->form->getField('certificate');
$emailField = $this->form->getField('email');
if ($fileField->isFilled(Language::err('FieldIsRequired'))) {
$fileField->isAllowedExtension(['p12'], Language::err('P12Only'));
}
$emailField->isFilled(Language::err('FieldIsRequired'));
$emailField->isEmail(Language::err('EmailIsInvalid'));
return $this->form->isCorrect();
}