Mrthdrb

Dears, how can I disable the purchase of Online e-gift card once the end user select the method of payment as: CASH ON DELIVERY? I don't want to let the users purchase an Online E-GIFT card and make the payment upon delivery?

First you will need to create events.xml file under app/code/Company/Module/etc/. Then write “payment_method_is_active” event in it. This is the event which hits on checkout page for payment method availability.

<?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="payment_method_is_active">
 <observer name="custom_payment" instance="CompanyModuleObserverPaymentMethodAvailable" />
 </event>
</config>

Now create PaymentMethodAvailable.php under Company/Module/Observer/ and write following code in the file. I am disabling the CASH ON DELIVERY payment method when there is gift card in your cart (You can get the CheckoutSession and check if there is any gift card in cart)

<?php

namespace CompanyModuleObserver;

use MagentoFrameworkEventObserverInterface;


class PaymentMethodAvailable implements ObserverInterface

 /**
 * payment_method_is_active event handler.
 *
 * @param MagentoFrameworkEventObserver $observer
 */
 public function execute(MagentoFrameworkEventObserver $observer)
 
 $giftCardFlag = false;
 if(//checkforcondition if giftCard in cart) 
 $giftCardFlag = true;
 

 // you can replace "checkmo" with your required payment method code
 if($observer->getEvent()->getMethodInstance()->getCode()=="youPaymentCode" && giftCardFlag) 
 $checkResult = $observer->getEvent()->getResult();
 $checkResult->setData('is_available', false); //this is disabling the payment method at checkout page
 
 

Now the payment method CASH ON DELIVERY is disabled from checkout page .