John Davidson

Message:

I need help. I am creating a custom payment method for Magento 2. In the plugin, user needs to enter the keys. While saving the config, I want to check if the keys entered by the user are correct or not. If the keys are incorrect, I want to show a message informing user about the issue.

I have googled about it and I thought I have found the event admin_system_config_changed_section_{sectionname}. I implemented it, cleared the cache and recompiled the code but when I save the config data for the payment method plugin, it does not trigger the class. I looked into Magento documentation. I could not find the exact full event name for it. These are the full event name I tried:

admin_system_config_changed_section_payment_methods
admin_system_config_changed_section_paymentmethods
admin_system_config_changed_section_sales

MyPayment/Payment/etc/adminhtml/events.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">

    <event name="admin_system_config_changed_section_payment_methods">

        <observer name="my_payment_admin_system_config_changed_section_paymentmethods" instance="MyPayment\Payment\Observer\CustomPaymentMethodConfigObserver" />

    </event>

</config>

MyPayment/Payment/Observer/CustomPaymentMethodConfigObserver

<?php



namespace MyPayment\Payment\Observer;



use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\Event\Observer;



class CustomPaymentMethodConfigObserver implements ObserverInterface

{

    public function execute(Observer $observer)

    {

        // some codes that did not trigger

    }

}

---

My Answer:
In Magento 2, the event you are looking for is `admin_system_config_changed_section_{sectionname}`. However, the section name for payment methods in Magento 2 is `payment`. So the correct event name you should use in your `events.xml` file is `admin_system_config_changed_section_payment`.

Here is an example of how you can define the event in your `events.xml` file:

xml








Then, you need to create the observer class `ValidateKeys` in your module:

php
namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

class ValidateKeys implements ObserverInterface
{
public function execute(\Magento\Framework\Event\Observer $observer)
{
// Your logic to validate the keys entered by the user
// You can get the data from the observer like this:
$section = $observer->getEvent()->getData('section');
$website = $observer->getEvent()->getData('website');
$store = $observer->getEvent()->getData('store');

// Check the keys and show a message if they are incorrect
// You can use \Magento\Framework\Message\ManagerInterface to show a message to the user

return $this;
}
}


Make sure to replace `Vendor\Module` with your actual module namespace and name.

After implementing this, clear the cache and try saving the config data for your payment method plugin again. The `ValidateKeys` observer should now be triggered when the payment section is saved, allowing you to validate the keys entered by the user.