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I am trying to set the custom price of product to cart using Magento2 but unable to do that. For that I have created a module TW - as namespace Cart- as Module name . So under TW/Cart I have created 2 folders etc and Observer. Below is the code in respective folders. Do i need to register this module by putting registration.php file under this module ? Please help me what am I doing wrong?

Code for etc/frontend/events.xml

<?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="cart_observer_customprice" instance="TWCartObserverCustomPrice" />
 </event>
</config>

Code for Observer/CustomPrice.php

namespace TWCartObserver;
 use MagentoFrameworkEventObserverInterface;
use MagentoFrameworkAppRequestInterface;
use PsrLogLoggerInterface;

class CustomPrice implements ObserverInterface

 protected $logger;
 public function __construct(LoggerInterface $logger)
 
 $this->logger = $logger;
 
 public function execute(MagentoFrameworkEventObserver $observer) 


 $item = $observer->getEvent()->getData('quote_item'); 
 $item = ( $item->getParentItem() ? $item->getParentItem() : $item );
 $price = 120; //set your price here
 $this->logger->debug("Hello I am here", [
 'price' => $price,
 ]);
 $item->setCustomPrice($price);
 $item->setOriginalCustomPrice($price);
 $item->getProduct()->setIsSuperMode(true);
 

First create a module using free module creator tool called silk software

Magento 2 Module Creator Tool Using Silk Software

and enable using following commands below.

1. php bin/magento module:enable Tw_Cart


2. php bin/magento setup:upgrade


3. php bin/magento setup:di:compile


4. php bin/magento setup:static-content:deploy

create events.xml in the path:- app/code/Tw/Cart/etc/frontend/events.xml

<?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="Tw_Cart_Addtocart_Customprice" instance="TWCartObserverCustomPrice" />
 </event>
</config>

create CustomPrice.php in the path: app/code/Tw/Cart/Observer/ & keep the below code

<?php
 namespace TWCartObserver;
 use MagentoFrameworkEventObserverInterface;
 use MagentoFrameworkAppRequestInterface;
 use PsrLogLoggerInterface;
 class CustomPrice implements ObserverInterface
 

 public function execute(MagentoFrameworkEventObserver $observer) 
 
 $writer = new ZendLogWriterStream(BP.'/var/log/stackexchange.log');
 $logger = new ZendLogLogger();
 $logger->addWriter($writer);
 /* Code here */
 $quote_item = $observer->getEvent()->getQuoteItem();
 $price = 400; //set your price here
 $quote_item->setCustomPrice($price);
 $quote_item->setOriginalCustomPrice($price);
 $quote_item->getProduct()->setIsSuperMode(true);
 $logger->info("success !!!!");