Disable payment options-only cash on delivery for particular product-magento

Question

I am using Magento 1.4.1.1 and i want to disable payment option for some products.i want to show only Cash on Delivery method for some products and need to hide other.

Answer 1

First create a product attribute (name : 'magepal_payment_filter_by_product', type : yes/no) to identify these products.

E.g base of Magento v1.7 you could

1. Auto enable payment module programmatically see https://stackoverflow.com/a/14023210/1191288

2. Enable all applicable payment module and filter which module to show where

In /app/code/local/MagePal/PaymentFilterByProduct/etc/config.xml

    
        
            1.0.1
        
    
    
        
            
                MagePal_PaymentFilterByProduct_Helper
            
            
                
                    MagePal_PaymentFilterByProduct_Helper_Payment_Data
                
                        
              
    

In /app/code/local/MagePal/PaymentFilterByProduct/Helper/Payment/Data.php

getStore()) || !$quote){
            return $methods;
        }

        //get a list of product in cart
        $cart = Mage::getSingleton('checkout/session');

        $specialProductInCart = array();

        foreach ($cart->getQuote()->getAllItems() as $item) {
            $specialProductInCart[] = $item->getMagepalPaymentFilterByProduct();                 
        }

        // if special product in cart 
        // need to if check $item->getMagepalPaymentFilterByProduct() return 'yes/no' or '0/1)
        if(in_array('yes', $specialProductInCart)){
           $filter_csv = Mage::getStoreConfig('paymentfilterbyproduct/filter_option/paymentfilter_special_products', Mage::app()->getStore()); 
        }
        else{
            $filter_csv = Mage::getStoreConfig('paymentfilterbyproduct/filter_option/paymentfilter_all_product', Mage::app()->getStore());
        }

        $filter_array = explode(",", $filter_csv);

        foreach ($methods as $k => $method){
            if(!in_array($method->getCode(), $filter_array))
                unset($methods[$k]);       
        }//methods

        return $methods;
    }
}

In /app/code/local/MagePal/PaymentFilterByProduct/etc/system.xml

    
        
            MagePal
            900
        
    
    
        
            Payment Method Filter by Product
            magepal
            1000
            1
            1
            1
            
                
                    General Options
                    text
                    1
                    1
                    1
                    1
                    
                        
                            Enable Payment Filter
                            select
                            adminhtml/system_config_source_yesno
                            50
                            1
                            1
                            1
                        
                    
                
                
                    Payment Method Filter Configuration
                    text
                    2
                    1
                    1
                    1
                    Please enable all applicable payment methods in system payment config
                    
                        
                            Select Default Payment option for All Products
                            multiselect
                            MagePal_PaymentFilterByProduct_ActivePaymentMethod
                            30
                            1
                            1
                            1
                        
                        
                            Select Payments for Cart with Special Products
                            multiselect
                            MagePal_PaymentFilterByProduct_ActivePaymentMethod
                            40
                            1
                            1
                            1
                        
                    
                
            
        
    

In /app/code/local/MagePal/PaymentFilterByProduct/Helper/Data.php

In /app/code/local/MagePal/PaymentFilterByProduct/ActivePaymentMethod.php

getActiveMethods();

       foreach ($payments as $paymentCode=>$paymentModel) {
           if($paymentModel->canUseCheckout() == 1){
                $paymentTitle = Mage::getStoreConfig('payment/'.$paymentCode.'/title');
                $methods[$paymentCode] = array(
                    'label'   => $paymentTitle,
                    'value' => $paymentCode,
                );
           }
        }

        return $methods;
    }
}

In /app/etc/modules/MagePal_PaymentFilterByProduct.xml

    
        
            true
            local