Set custom price of Product when adding to cart

Create events.xml file in folder ‘Magemonkeys/Cartmodule/etc/frontend’ and use event ‘checkout_cart_product_add_after’. And paste the below code in it.

<?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="checkout_cart_product_add_after">
        <observer name="addprice" instance="Magemonkeys\Cartmodule\Observer\AddPrice" />
    </event>
</config>

<?xml version="1.0"?>

</event>

</config>

And now create ‘AddPrice.php’ file in ‘Observer’ folder with the following code:

<?php
    namespace Magemonkeys\Cartmodule\Observer;
 
    use Magento\Framework\Event\ObserverInterface;
    use Magento\Framework\App\RequestInterface;
 
    class AddPrice implements ObserverInterface
    {
        public function execute(\Magento\Framework\Event\Observer $observer) {
            $item = $observer->getEvent()->getData('quote_item');         
            $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
            $price = 50; // set custom price here
            $item->setCustomPrice($price);
            $item->setOriginalCustomPrice($price);
            $item->getProduct()->setIsSuperMode(true);
        }
 
    }
?>

<?php

namespace Magemonkeys\Cartmodule\Observer;

use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\App\RequestInterface;

class AddPrice implements ObserverInterface

{

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

$item = $observer->getEvent()->getData('quote_item');

$item = ( $item->getParentItem() ? $item->getParentItem() : $item );

$price = 50; // set custom price here

$item->setCustomPrice($price);

$item->setOriginalCustomPrice($price);

$item->getProduct()->setIsSuperMode(true);

}

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