Magento 2 - Disable Payment Method based on Customer Attribute

Question

I have a custom offline payment method that I want to show based on a customer attribute value. Eventually I want to check that value against the total and if it is less than the total then disable the method. But first thing is first, I can't seem to get the customer attribute. I am testing with group_id which in this case is 1. This is what I have:

etc > events.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="sales_order_save_before">
        <observer name="payroll_split_payment_before_save" instance="Vendor\Module\Observer\QuoteToOrderObserver" />
    </event>

    <event name="payment_method_is_active">
        <observer name="payroll_payment_method_is_active" instance="Vendor\Module\Observer\DisablePayment" />
    </event>
</config>

and my Observer:

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Psr\Log\LoggerInterface;

class DisablePayment implements ObserverInterface
{
  protected $_customerRepositoryInterface;
  protected $_logger;

  public function __construct(
    // --> delete this line and replace with answer below \Magento\Customer\Api\CustomerRepositoryInterface $customerRepositoryInterface,
    LoggerInterface $logger
  ) {
    // --> delete this line and replace with answer below $this->_customerRepositoryInterface = $customerRepositoryInterface;
    $this->_logger = $logger;
  }

  /**
   * @param Observer $observer
   *
   * @return void
   */
  public function execute(
    \Magento\Framework\Event\Observer $observer
    )
  {

    $result = $observer->getEvent()->getResult();
    $method_instance = $observer->getEvent()->getMethodInstance()->getCode();
    $quote = $observer->getEvent()->getQuote();

    if($method_instance == 'payroll')
    { 
      $customer = $this->_customerRepositoryInterface->getById($quote->getCustomer()->getId());
      if($customer->getCustomAttribute('group_id')->getValue() == 1)
      {
        $result->setData('is_available', false);
      }
    }
  }
}

I get this error:

'Uncaught Error: Call to a member function getValue() on null in DisablePayment.php

What am I doing wrong?

Answer 1

You can use Magento\Customer\Model\Session $customerSession to get current customer group id for logged in customers.

You can use the below code in your DisablePayment.php file for the same.

namespace Vendor\Module\Observer;

use Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;
use Psr\Log\LoggerInterface;

class DisablePayment implements ObserverInterface
{
  protected $_customerSession;
  protected $_logger;

  public function __construct(
    \Magento\Customer\Model\Session $customerSession,
    LoggerInterface $logger
  ) {
    $this->_customerSession = $customerSession;
    $this->_logger = $logger;
  }

  /**
   * @param Observer $observer
   *
   * @return void
   */
  public function execute(Observer $observer)
  {

    $result = $observer->getEvent()->getResult();
    $method_instance = $observer->getEvent()->getMethodInstance()->getCode();
    $quote = $observer->getEvent()->getQuote();

    if($method_instance == 'payroll')
    { 
        $customerGroupId = $this->getGroupId();
        if($customerGroupId == 1)
        {
            $result->setData('is_available', false);
        }
    }
  }

  public function getGroupId(){
     if($this->_customerSession->isLoggedIn()):
            return $customerGroup=$this->_customerSession->getCustomer()->getGroupId();
     endif;
  }
}

Hope it helps!!!