Magento 2: Disable payment method based on customer group using observer

Create the events.xml file in your custom module and add the below code.

<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="cust_payment_disable" instance="Vendor\Module\Observer\PaymentDisable" />
    </event>
</config>

</event>

</config>

Create observer PaymentDisable.php file in your customer module and add below code.

<?php
namespace Vendor\Module\Observer;
use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class PaymentDisable implements ObserverInterface {
    protected $_customerSession;
    public function __construct(
       \Magento\Customer\Model\Session $customerSession,
       \Magento\Customer\Model\GroupRegistry $groupRegistry
    ) {
       $this->_customerSession = $customerSession;
       $this->groupRegistry = $groupRegistry;
    }
    public function execute(Observer $observer) {
       $payment_method_code = $observer->getEvent()->getMethodInstance()->getCode();
       if ($payment_method_code == 'purchaseorder') {
           $result = $observer->getEvent()->getResult();
            if ($this->_customerSession->isLoggedIn()) {
                $customer = $this->_customerSession->getCustomer();
                $customerGroup = $customer->getGroupId();
                if($customerGroup == 4){
                    $result->setData('is_available', false);
                }
            }
        }
    }
}

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\Observer;

use Magento\Framework\Event\ObserverInterface;

class PaymentDisable implements ObserverInterface {

protected $_customerSession;

public function __construct(

\Magento\Customer\Model\Session $customerSession,

\Magento\Customer\Model\GroupRegistry $groupRegistry

) {

$this->_customerSession = $customerSession;

$this->groupRegistry = $groupRegistry;

}

public function execute(Observer $observer) {

$payment_method_code = $observer->getEvent()->getMethodInstance()->getCode();

if ($payment_method_code == 'purchaseorder') {

$result = $observer->getEvent()->getResult();

if ($this->_customerSession->isLoggedIn()) {

$customer = $this->_customerSession->getCustomer();

$customerGroup = $customer->getGroupId();

if($customerGroup == 4){

$result->setData('is_available', false);

}

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