Enable COD payment method for some products using programming in Magento 2

If you want to Enable COD Payment Method for Particular Products, Follow below steps

You need to create an extension for this,

Here I have created extension : Magemonkeys_CodRestrict

1. Add new YES/NO product attribute i.e enable_cod_payment and set in Attribute Set which you are using for products

2. Create registration.php file in app/code/Magemonkeys/CodRestrict and add below code

<?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Magemonkeys_CodRestrict',
__DIR__
);

<?php

\Magento\Framework\Component\ComponentRegistrar::register(

\Magento\Framework\Component\ComponentRegistrar::MODULE,

'Magemonkeys_CodRestrict',

__DIR__

);

3. Create module.xml file in app/code/Magemonkeys/CodRestrict/etc and add below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
	<module name="Magemonkeys_CodRestrict" setup_version="1.0">
	</module>
</config>

<?xml version="1.0"?>

</module>

</config>

3. Create module.xml file in app/code/Magemonkeys/CodRestrict/etc and add below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
	<module name="Magemonkeys_CodRestrict" setup_version="1.0">
	</module>
</config>

<?xml version="1.0"?>

</module>

</config>

4. Create events.xml file in app/code/Magemonkeys/CodRestrict/etc and add below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="payment_method_is_active">
        <observer name="codpayment" instance="Magemonkeys\CodRestrict\Observer\CodAvailable" />
    </event>
</config>

<?xml version="1.0"?>

</event>

</config>

5. Create CodAvailable.php file in app/code/Magemonkeys/CodRestrict/Observer and add below code

<?php
 
namespace Magemonkeys\CodRestrict\Observer;
 
use Magento\Framework\Event\ObserverInterface;
 
class CodAvailable implements ObserverInterface
{
	/**
     * payment_method_is_active event handler.
     *
     * @param \Magento\Framework\Event\Observer $observer
     */
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $objectManager = \Magento\Framework\App\ObjectManager::getInstance();

		$cartObj = $objectManager->get('\Magento\Checkout\Model\Cart');

		$cartItemsCollection = $cartObj->getQuote()->getItemsCollection(); 

		$cartItemsVisible = $cartObj->getQuote()->getAllVisibleItems(); 

		$itemsArray = $cartObj->getQuote()->getAllItems();
		$enable_cod_payment = array();
		foreach($itemsArray as $item) {
			$productid = $item->getProductId();
			$product = $objectManager->create('Magento\Catalog\Model\Product')->load($productid);
   			$enable_cod_payment[] = $product->getData('enable_cod_payment');   			
		}


        if($observer->getEvent()->getMethodInstance()->getCode()=="cashondelivery"){
			if(in_array(0, $enable_cod_payment)){
	            $checkResult = $observer->getEvent()->getResult();
	            $checkResult->setData('is_available', false);
	        }
    	}
    }
}

<?php

namespace Magemonkeys\CodRestrict\Observer;

use Magento\Framework\Event\ObserverInterface;

class CodAvailable implements ObserverInterface

{

/**

* payment_method_is_active event handler.

* @param \Magento\Framework\Event\Observer $observer

public function execute(\Magento\Framework\Event\Observer $observer)

{

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();

$cartObj = $objectManager->get('\Magento\Checkout\Model\Cart');

$cartItemsCollection = $cartObj->getQuote()->getItemsCollection();

$cartItemsVisible = $cartObj->getQuote()->getAllVisibleItems();

$itemsArray = $cartObj->getQuote()->getAllItems();

$enable_cod_payment = array();

foreach($itemsArray as $item) {

$productid = $item->getProductId();

$product = $objectManager->create('Magento\Catalog\Model\Product')->load($productid);

$enable_cod_payment[] = $product->getData('enable_cod_payment');

}

if($observer->getEvent()->getMethodInstance()->getCode()=="cashondelivery"){

if(in_array(0, $enable_cod_payment)){

$checkResult = $observer->getEvent()->getResult();

$checkResult->setData('is_available', false);

}

You can change payment method condition as per your need.

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