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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.