I need to link already registered user to the customer group. I'm trying to solve it using event and observer. User will receive a link and logging in using the present link, the customer will be attached to the new customer group


namespace Limegrow\CustomerGroupJoin\Observer;

use Magento\Customer\Api\CustomerRepositoryInterface;

class CustomerLoginSuccess implements \Magento\Framework\Event\ObserverInterface {

 * @var CustomerRepositoryInterface

private $customerRepository;
private $groupCollectionFactory;

public function __construct(
    \Magento\Framework\App\RequestInterface $request,
     CustomerRepositoryInterface $customerRepository,
     \Magento\Customer\Model\ResourceModel\Group\CollectionFactory $groupCollectionFactory
    $this->_request = $request;
    $this->customerRepository = $customerRepository;
    $this->groupCollectionFactory = $groupCollectionFactory;


public function execute(
    \Magento\Framework\Event\Observer $observer

    $id = $observer->getEvent()->getCustomer()->getId();
    $customer = $observer->getEvent()->getCustomer();    
    $invite_code = $this->_request->getParam('invite_code');
    $groupCollection = $this->groupCollectionFactory->create();
    $groupCollection->addFieldToFilter('invite_code', $invite_code);
    foreach ($groupCollection as $group) {


Currently a customer can log in, however, the group will be unchanged.

  • What is the observer name you use to handle it? How do you declare your observer? Is your observer executed when user login? – Rendy Eko Prastiyo Aug 21 '19 at 19:51

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