Multiselect field of custom payment module not loading on frontend

Question

My Custom Payment Module is appearing on front end but its multiselect field is not loading.

config.xml

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <Magik_Paymentpro>
            <version>0.1.0</version>
        </Magik_Paymentpro>
    </modules> 
   <global>
      <models>
         <paymentpro>
            <class>Magik_Paymentpro_Model</class>
         </paymentpro>
      </models>
   </global>
   <default>
      <payment>
         <paymentpro>
            <active>1</active>
            <model>paymentpro/paymentmethod</model>
            <order_status>processing</order_status>
            <title>TCS Cash Payment Methods</title>
         </paymentpro>
      </payment>
   </default>
</config>  

system.xml

<?xml version="1.0"?>
<config>
<sections>
<!-- payment tab -->
<payment>
<groups>
<!-- paymentpro fieldset -->
<paymentpro translate="label" module="paygate">
<!-- will have title 'Cash On Delivery' -->
<label>TCS Cash Payment Methods</label>
<!-- position between other payment methods -->
<sort_order>1</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>0</show_in_store>
<fields>
<!-- is this payment method active for the website? -->
<active translate="label">
<!-- label for the field -->
<label>Enabled</label>
<!-- input type for configuration value -->
<frontend_type>select</frontend_type>
<!-- model to take the option values from -->
<source_model>adminhtml/system_config_source_yesno</source_model>
<!-- field position -->
<sort_order>1</sort_order>
<!-- do not show this field in store scope -->
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>0</show_in_store>
</active>
<order_status translate="label">
<label>New order status</label>
<frontend_type>select</frontend_type>
<source_model>adminhtml/system_config_source_order_status</source_model>
<!--<source_model>adminhtml/system_config_source_order_status_new</source_model>-->
<!--<source_model>adminhtml/system_config_source_order_status_processing</source_model>-->
<sort_order>2</sort_order>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>0</show_in_store>
</order_status>
<title translate="label">
    <label>TCS Cash Payment Methods</label>
    <frontend_type>text</frontend_type>
    <sort_order>3</sort_order>
    <show_in_default>1</show_in_default>
    <show_in_website>1</show_in_website>
    <show_in_store>1</show_in_store>
</title>                       
<allowspecific translate="label">
<label>Payment from applicable countries</label>
<frontend_type>allowspecific</frontend_type>
<sort_order>4</sort_order>
<source_model>adminhtml/system_config_source_payment_allspecificcountries</source_model>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</allowspecific>
<specificcountry translate="label">
<label>Payment from Specific countries</label>
<frontend_type>multiselect</frontend_type>
<sort_order>5</sort_order>
<source_model>adminhtml/system_config_source_country</source_model>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>1</show_in_store>
</specificcountry>
<cashmethod translate="label">
<label>Cash Method</label>
<frontend_type>multiselect</frontend_type>
<sort_order>6</sort_order>
<source_model>paymentpro/paymentmethod</source_model>
<show_in_default>1</show_in_default>
<show_in_website>1</show_in_website>
<show_in_store>0</show_in_store>
</cashmethod>
</fields>
</paymentpro>
</groups>
</payment>
</sections>
</config>

Magik/Paymentpro/Model/Paymentmethod.php

<?php
class Magik_Paymentpro_Model_Paymentmethod extends Mage_Payment_Model_Method_Abstract
{
    protected $_code  = 'paymentpro';
    protected $_isGateway = true;
    protected $_canAuthorize = true;
    protected $_canCapture = true;
    protected $_canCapturePartial = false;
    protected $_canRefund = true;
    protected $_canVoid = true;
    protected $_canUseInternal = true;
    protected $_canUseCheckout = true;
    protected $_canUseForMultishipping = true;
    protected $_canSaveCc = false;
    //protected $_formBlockType = 'payment/form_checkmo';
    //protected $_infoBlockType = 'payment/info_cod';

    /**
    * Assign data to info model instance
    *
    * @param   mixed $data
    * @return  Mage_Payment_Model_Method_Checkmo
    */

  public function toOptionArray()
  {
    return array(
      array('value' => 0, 'label' => 'Cash On Delivery'),
      array('value' => 1, 'label' => 'Cash At Doorstep')   );
  }
    public function authorize(Varien_Object $payment, $amount){
        $data = $payment->getData();
        /*
        $data = array(
        store_id,
        customer_payment_id,
        method,
        additional_data,
        po_number,
        cc_type,
        cc_number_enc,
        cc_last4,
        cc_owner,
        cc_exp_month,
        cc_exp_year,
        cc_number,
        cc_cid,
        cc_ss_issue,
        cc_ss_start_month,
        cc_ss_start_year,
        parent_id,
        amount_ordered,
        base_amount_ordered,
        shipping_amount,
        base_shipping_amount,
        method_instance)
        */
    }
    public function capture(Varien_Object $payment, $amount){
        // Grab stored payment data array for processing
        $paymentData = unserialize($payment->getAdditionalData());
    }
    public function void(Varien_Object $payment){
        // actions when order is voided occur here
    }
    public function refund(Varien_Object $payment, $amount){
        // actions when order is refunded occur here
    }   
    public function assignData($data){
        $details = array();
        if ($this->getPayableTo()) {
        $details['payable_to'] = $this->getPayableTo();
        }
        if ($this->getMailingAddress()) {
        $details['mailing_address'] = $this->getMailingAddress();
        }
        if (!empty($details)) {
        $this->getInfoInstance()->setAdditionalData(serialize($details));
        }
        return $this;
    }

    public function getPayableTo(){
        return $this->getConfigData('payable_to');
    }

    public function getMailingAddress(){
        return $this->getConfigData('mailing_address');
    }
}

layout/paymentpro.xml

<?xml version="1.0"?>
<layout version="0.1.0">
    <catalog_product_view>
        <reference name="product.info">
            <block type="paymentpro/catalog_product_view_profile" name="product.info.additional.recurring.schedule" as="recurring_info" template="paymentpro/catalog/product/view/profile/schedule.phtml">
                <action method="addToParentGroup"><group>detailed_info</group></action>
                <action method="setTitle" translate="value"><value>Recurring Profile</value></action>
            </block>
        </reference>
        <reference name="product.info.options.wrapper">
            <block type="paymentpro/catalog_product_view_profile" name="product.info.options.recurring" as="recurring_options" template="paymentpro/catalog/product/view/profile/options.phtml"/>
        </reference>
    </catalog_product_view>
</layout>

paymentpro/paymentpro.phtml

<?php
// Retrieve order
$_order = new Mage_Sales_Model_Order();
$orderId = Mage::getSingleton('checkout/session')->getLastRealOrderId();
$_order->loadByIncrementId($orderId);
?>
<form name="paymentproform" method="post" action="http://www.gateway.com/the_url_they_gave_me">
    <input type="hidden" name="orderid" value="<?php echo $orderId; ?>">
    <input type="hidden" name="grandtotal" value="<?php echo $_order->getBaseGrandTotal(); ?>">
</form>
<script type="text/javascript">
document.paymentproform.submit();
</script>

etc/modules/Magik_Paymentpro.xml

<?xml version="1.0"?>
<config>
<modules>
<!-- declare Magik_Paymentpro module -->
<Magik_Paymentpro>
<!-- this is an active module -->
<active>true</active>
<!-- this module will be located in app/code/local code pool -->
<codePool>local</codePool>
<!-- specify dependencies for correct module loading order -->
<depends>
<Mage_Payment />
</depends>
<!-- declare module's version information for database updates -->
<version>0.1.0</version>
</Magik_Paymentpro>
</modules>
</config>

Answer 1

One of your problems is in Magik/Paymentpro/Model/Paymentmethod.php. You don't have your block type defined.

You need this to tell Magento where to find your payment block:

protected $_formBlockType = 'paymentpro/form_paymentpro';

Next, you don't have a block defined for your extension. In config.xml you need the following in your global section:

<blocks>
    <paymentpro>
        <class>Magik_Paymentpro_Block</class>
    </paymentpro>
</blocks>

You'll need to add the Block in your extension file structure.

Add the following folders and file:

app/code/local/Magik/Paymentpro/Block/Form/Paymentpro.php

Inside Paymentpro.php:

class Magik_Paymentpro_Block_Form_Paymentpro extends Mage_Payment_Block_Form
{
    protected function _construct()
    {
        parent::_construct();

        // This is the template for paymentpro/form/paymentpro.phtml
        // You have this in paymentpro/paymentpro.phtml in your code
        // above and that's ok, but to keep thing consistent you
        // should do it like this.

        $this->setTemplate('paymentpro/form/paymentpro.phtml');
    }
}

Move paymentpro/paymentpro.phtml to paymentpro/form/paymentpro.phtml. You can put the code for your multiselect in there.

The code you have in layout/paymentpro.xml is for recurring profiles. You don't have this set up correctly. You can remove it.