Magento 2: Change customer group before saving the customer using plugin

Create di.xml file your module and add the below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Customer\Api\CustomerRepositoryInterface">
        <plugin name="save_customer_group" type="Vendor\Module\Plugin\Magento\Customer\Api\CustomerRepositoryPlugin" />
    </type>
</config>

<?xml version="1.0"?>

</type>

</config>

Create plugin file under this directory Vendor/Module/Plugin/Magento/Customer/Api/CustomerRepositoryPlugin.php

<?php
namespace Vendor\Module\Plugin\Magento\Customer\Api;

use Magento\Customer\Api\Data\CustomerInterface;
use Magento\Customer\Api\CustomerRepositoryInterface;
use Magento\Framework\Controller\ResultFactory;
use Magento\Framework\UrlInterface;
use Magento\Framework\Exception\LocalizedException;

class CustomerRepositoryPlugin
{
    /**
     * @var Data
     */
    private $helper;

    /**
     * Constructor of class.
     *
     * @param Data $helper
     */
    public function __construct(
        \Magento\Framework\App\RequestInterface $request,
        \Magento\Customer\Model\ResourceModel\Group\CollectionFactory $groupCollection,
        \Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,
        \Magento\Customer\Api\GroupRepositoryInterface $groupRepository,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        ResultFactory $resultFactory,
        UrlInterface $url
    ) {
        $this->request = $request;
        $this->groupCollection = $groupCollection;
        $this->scopeConfig = $scopeConfig;
        $this->groupRepository = $groupRepository;
        $this->messageManager = $messageManager;
        $this->resultFactory = $resultFactory;
        $this->url = $url;
    }

    /**
     *
     * @param CustomerRepositoryInterface $subject
     * @param CustomerInterface $customer
     * @return array
     */
    public function beforeSave(CustomerRepositoryInterface $subject, CustomerInterface $customer, $passwordHash = null)
    {
        $groupid = 5; //change customer group id here
        $customer->setGroupId($groupId);
        return [$customer, $passwordHash];
    }
}

<?php

namespace Vendor\Module\Plugin\Magento\Customer\Api;

use Magento\Customer\Api\Data\CustomerInterface;

use Magento\Customer\Api\CustomerRepositoryInterface;

use Magento\Framework\Controller\ResultFactory;

use Magento\Framework\UrlInterface;

use Magento\Framework\Exception\LocalizedException;

class CustomerRepositoryPlugin

{

/**

* @var Data

private $helper;

/**

* Constructor of class.

* @param Data $helper

public function __construct(

\Magento\Framework\App\RequestInterface $request,

\Magento\Customer\Model\ResourceModel\Group\CollectionFactory $groupCollection,

\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig,

\Magento\Customer\Api\GroupRepositoryInterface $groupRepository,

\Magento\Framework\Message\ManagerInterface $messageManager,

ResultFactory $resultFactory,

UrlInterface $url

) {

$this->request = $request;

$this->groupCollection = $groupCollection;

$this->scopeConfig = $scopeConfig;

$this->groupRepository = $groupRepository;

$this->messageManager = $messageManager;

$this->resultFactory = $resultFactory;

$this->url = $url;

}

/**

* @param CustomerRepositoryInterface $subject

* @param CustomerInterface $customer

* @return array

public function beforeSave(CustomerRepositoryInterface $subject, CustomerInterface $customer, $passwordHash = null)

{

$groupid = 5; //change customer group id here

$customer->setGroupId($groupId);

return [$customer, $passwordHash];

}

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