public function attributeHints()
 {
     return ArrayHelper::merge(parent::attributeHints(), ['isLive' => 'If is live used url: https://www.paypal.com/cgi-bin/websc else https://www.sandbox.paypal.com/cgi-bin/websc']);
 }
 public function attributeHints()
 {
     return ArrayHelper::merge(parent::attributeHints(), ['isLive' => '', 'payment_type' => 'Смотреть https://tech.yandex.ru/money/doc/payment-solution/reference/payment-type-codes-docpage/']);
 }
 public function attributeHints()
 {
     return ArrayHelper::merge(parent::attributeHints(), ['isLive' => 'If is live used: https://auth.robokassa.ru/Merchant/Index.aspx else http://test.robokassa.ru/Index.aspx']);
 }
 public function attributeHints()
 {
     return ArrayHelper::merge(parent::attributeHints(), ['isLive' => '']);
 }