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I want to create coupon code for specific product and custom option

E.g.

Sku: Test1

Custom Option:

Name: Demo Custom Option

Option Type: Field

I want to apply the coupon code if customer have enter the name, if not filled customer will not allow to apply the coupon.

The solution is to use a plugin on MagentoQuoteModelCouponManagement on the set method:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <type name="MagentoQuoteModelCouponManagement">
 <plugin name="checkout_coupon_apply"
 type="VendorModulePluginCheckoutCouponApply"/>
 </type>
</config>

Create plugin:

<?php 

namespace VendorModulePlugin;

class CheckoutCouponApply 

 public function beforeSet(CouponManagement $subject, $cartId, $couponCode)
 
 /**
 * Quote repository.
 *
 * @var MagentoQuoteApiCartRepositoryInterface
 */
 protected $quoteRepository;

 /**
 * Constructs a coupon read service object.
 *
 * @param MagentoQuoteApiCartRepositoryInterface $quoteRepository Quote repository.
 */
 public function __construct(
 MagentoQuoteApiCartRepositoryInterface $quoteRepository
 ) 
 $this->quoteRepository = $quoteRepository;
 

 public function beforeSet(CouponManagement $subject, $cartId, $couponCode)
 
 foreach ($this->quoteRepository->getAllItems() as $value) 
 // Do what you need to do 
 // throw new CouldNotSaveException(__('You will not allow to use coupon code'));
 

 

 

You can create coupon code via backend.

Steps : Login to backend -> Menu -> Marketing -> Cart Price Rule ->
Add New Rule

Under that Form you will find conditions section, Under That section you can add conditions based on your criteria.

You will see Attribute Drop-down Under Condition section.

If your Attribute not there then, you need to follow step,

Backend Login -> Menu -> Stores -> Products (Attribute section) ->
search your attribute - > Click on that Row

Under that page you will find storefront properties, in that change the value of Use for Promo Rule Conditions to YES .

Run php bin/magento c:f command via Terminal.