Magento2 – Set custom price of Product when adding to cart

Here we will see how to set custom price of product in magento2.
You can change product price when adding product to cart. You can achieve this by Observer.

learn here how to create observer in Magento2.

Set Custom Price of Product

First create events.xml file in folder ‘Webkul/Hello/etc/frontend’ and use event ‘checkout_cart_product_add_after’.

<?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="customprice" instance="Webkul\Hello\Observer\CustomPrice" />
	</event>
</config>

Now create CustomPrice.php file in Observer folder.

<?php
	/**
	 * Webkul Hello CustomPrice Observer
	 *
	 * @category    Webkul
	 * @package     Webkul_Hello
	 * @author      Webkul Software Private Limited
	 *
	 */
	namespace Webkul\Hello\Observer;

	use Magento\Framework\Event\ObserverInterface;
	use Magento\Framework\App\RequestInterface;

	class CustomPrice implements ObserverInterface
	{
		public function execute(\Magento\Framework\Event\Observer $observer) {
			$item = $observer->getEvent()->getData('quote_item');			
			$item = ( $item->getParentItem() ? $item->getParentItem() : $item );
			$price = 100; //set your price here
			$item->setCustomPrice($price);
			$item->setOriginalCustomPrice($price);
			$item->getProduct()->setIsSuperMode(true);
		}

	}