Роман

public function rules()
    {
        return [
            [['user_id', 'payment_method', 'credit_card_number', 'credit_card_expr', 'credit_card_cvv', 'credit_card_info','type_pay'], 'required', 'when' => function($model) {
                return $model->type_pay == 0;
            },'whenClient' => "function (attribute, value) {
                return $('input[name=\"Payment[type_pay]\"]:checked').val() == 0;
            }"],
            [[ 'pre_auth_payment', 'day_month', 'transit_number', 'institution_id', 'account_num'], 'required',  'when' => function($model) {
                return $model->type_pay == 1;
            },'whenClient' => "function (attribute, value) {
                return $('input[name=\"Payment[type_pay]\"]:checked').val() == 1;
            }"],

            [['user_id'], 'integer'],
            [['type_pay'], 'required'],
            [['payment_method', 'credit_card_number', 'credit_card_expr', 'credit_card_cvv', 'credit_card_info', 'pre_auth_payment', 'day_month', 'transit_number', 'institution_id', 'account_num'], 'string', 'max' => 255]
        ];
    }