In Magento 2
Let’s create a module.
Step 1) Create folders like this.
app/code/Pits/PaymentMethod/etc/
app/code/Pits/PaymentMethod/Observer/
Step 2) Declare your module
app/code/Pits/PaymentMethod/etc/module.xml.
Paste the following code in the above file.
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Pits_PaymentMethod" setup_version="2.0.0" /></config>
Step 4 ) Create registration file.
app/code/Pits/PaymentMethod/registration.php
Paste the below code.
<?php
\Magento\Framework\Component\ComponentRegistrar::register(
\Magento\Framework\Component\ComponentRegistrar::MODULE,
'Pits_PaymentMethod',
__DIR__
);
Step 5)Run the below command in the command line
php bin/magento module:enable Pits_PaymentMethod
php bin/magento setup:upgrade
Step 6)Lets create events.xml file
app/code/Pits/PaymentMethod/etc/events.xml
Paste the below code in it.
<?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="Pits_PaymentMethod_DisabledPgByCustomergroup" instance="Pits\PaymentMethod\Observer\DisabledPgByCustomergroup" />
</event>
</config>
Step 7)Lets create observer file
app/code/Pits/PaymentMethod/Observer/DisabledPgByCustomergroup.php.php
<?php
namespace Pits\PaymentMethod\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\App\Request\DataPersistorInterface;
use Magento\Framework\App\ObjectManager;
class DisabledPgByCustomergroup implements ObserverInterface
{
public function __construct(\Psr\Log\LoggerInterface $logger)
{
$this->_logger = $logger;
}
/**
*
* @param \Magento\Framework\Event\Observer $observer
* @return void
*/
public function execute(\Magento\Framework\Event\Observer $observer)
{
$result = $observer->getEvent()->getResult();
$method_instance = $observer->getEvent()->getMethodInstance();
$quote = $observer->getEvent()->getQuote();
$this->_logger->info($method_instance->getCode());
/* If Cusomer group is match then work */
if (null !== $quote && $quote->getCustomerGroupId() != 4) {
/* Disable All payment gateway exclude Your payment Gateway*/
if ($method_instance->getCode() == 'purchaseorder') {
$result->setData('is_available', false);
}
}
/*else{
if($method_instance->getCode() =='purchaseorder'){
$result->setData('is_available', true);
}
}*/
}
}
Step 8)Run this in command line
php bin/magento setup:upgrade