Please follow the below steps if you want to disable add to cart for a particular customer group.

Step 1: Create a plugin and define in Magemonkeys/Customerrestriction/etc/di.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <!-- Disable Add to Cart -->
    <type name="Magento\Catalog\Model\Product">
        <plugin name="IsSalablePluginAfter" type="Magemonkeys\Customerrestriction\Plugin\IsSalablePlugin"/>
    </type>
</config>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

</type>

</config>

Step 2: Create a configuration field to select a customer group so that you can disable add to cart for that particular group in Magemonkeys/Customerrestriction/etc/adminhtml/system.xml.

<?xml version="1.0" encoding="UTF-8"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../Magento/Config/etc/system_file.xsd">
    <system>
        <section id="catalog">
            <group id="customer_group" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="1" showInStore="1">
                <field id="disable_cutomer_group" translate="label" type="multiselect" sortOrder="80" showInDefault="1" showInWebsite="1" showInStore="0">
                    <label>Disbale Add to Cart</label>
                    <source_model>Magemonkeys\Customerrestriction\Model\Config\Source\Customer\Group</source_model>
                    <can_be_empty>1</can_be_empty>
                    <comment>Please slect only one group</comment>
                </field>
            </group>
        </section>
    </system>
</config>

<?xml version="1.0" encoding="UTF-8"?>

<label>Disbale Add to Cart</label>

<source_model>Magemonkeys\Customerrestriction\Model\Config\Source\Customer\Group</source_model>

<can_be_empty>1</can_be_empty>

<comment>Please slect only one group</comment>

</field>

</group>

</section>

</system>

</config>

Step 3: Create a source model on this path Magemonkeys/CustomerrestrictionModel/Config/Source/Customer/Group.php

<?php
namespace Magemonkeys\Customerrestriction\Model\Config\Source\Customer;
 
class Group implements \Magento\Framework\Option\ArrayInterface
{

    /**
     * @var \Magento\Customer\Model\ResourceModel\Group\CollectionFactory
     */
    private $_groupCollectionFactory;

    private $_options;

    public function __construct(\Magento\Customer\Model\ResourceModel\Group\CollectionFactory $groupCollectionFactory)
    {
        $this->_groupCollectionFactory = $groupCollectionFactory;
    }
 
    /**
     * @return array
     */
    public function toOptionArray()
    {
        if (!$this->_options) {
            $this->_options = $this->_groupCollectionFactory->create()->loadData()->toOptionArray();
        }
        return $this->_options;
    }
}

<?php

namespace Magemonkeys\Customerrestriction\Model\Config\Source\Customer;

class Group implements \Magento\Framework\Option\ArrayInterface

{

/**

* @var \Magento\Customer\Model\ResourceModel\Group\CollectionFactory

private $_groupCollectionFactory;

private $_options;

public function __construct(\Magento\Customer\Model\ResourceModel\Group\CollectionFactory $groupCollectionFactory)

{

$this->_groupCollectionFactory = $groupCollectionFactory;

}

/**

* @return array

public function toOptionArray()

{

if (!$this->_options) {

$this->_options = $this->_groupCollectionFactory->create()->loadData()->toOptionArray();

}

return $this->_options;

}

Step 4: Set default value for the disable add to cart configuration field. You have to add the below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Store:etc/config.xsd">
    <default>
        <catalog>
            <customer_group>
                <disable_cutomer_group>0</active>
            </wkmodule>
        </payment>
    </default>
</config>

<?xml version="1.0"?>

<customer_group>

<disable_cutomer_group>0</active>

</wkmodule>

</payment>

</default>

</config>

on this path: Magemonkeys/CustomerrestrictionModel/etc/config.xml

Step 5: Now create a plugin for disable add to cart for a particular customer group :

<?php

declare(strict_types=1);

namespace Magemonkeys\Customerrestriction\Plugin;

use Magento\Framework\App\Http\Context;
use Magento\Customer\Model\Context as CustomerContext;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Store\Model\ScopeInterface;

/**
 * Class IsSalablePlugin
 *
 * @category Plugin
 */
class IsSalablePlugin
{
    /**
     * Scope config
     *
     * @var ScopeConfigInterface
     */
    protected $scopeConfig;

    /**
     * HTTP Context
     * Customer session is not initialized yet
     *
     * @var Context
     */
    protected $context;

    /**
     * @var \Magento\Customer\Model\Session
     */
    protected $_customerSession;

    /**
     * SalablePlugin constructor.
     *
     * @param ScopeConfigInterface $scopeConfig ScopeConfigInterface
     * @param Context              $context     Context
     */
    public function __construct(
        ScopeConfigInterface $scopeConfig,
        \Magento\Customer\Model\Session $customerSession,
        Context $context
    ) {
        $this->scopeConfig = $scopeConfig;
        $this->context = $context;
        $this->_customerSession = $customerSession;
    }

    /**
     * Check if customer group for disable add to cart functionality
     *
     * @return bool
     */
    public function afterIsSalable(): bool
    {
        $groupId = $this->scopeConfig->getValue('catalog/customer_group/disable_cutomer_group',\Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT);
        $customerGroup = $this->_customerSession->getCustomer()->getGroupId();
        if($customerGroup == $groupId)
        {
            return false;
        }
        
        return true;
    }
}

<?php

declare(strict_types=1);

namespace Magemonkeys\Customerrestriction\Plugin;

use Magento\Framework\App\Http\Context;

use Magento\Customer\Model\Context as CustomerContext;

use Magento\Framework\App\Config\ScopeConfigInterface;

use Magento\Store\Model\ScopeInterface;

/**

* Class IsSalablePlugin

* @category Plugin

class IsSalablePlugin

{

/**

* Scope config

* @var ScopeConfigInterface

protected $scopeConfig;

/**

* HTTP Context

* Customer session is not initialized yet

* @var Context

protected $context;

/**

* @var \Magento\Customer\Model\Session

protected $_customerSession;

/**

* SalablePlugin constructor.

* @param ScopeConfigInterface $scopeConfig ScopeConfigInterface

* @param Context $context Context

public function __construct(

ScopeConfigInterface $scopeConfig,

\Magento\Customer\Model\Session $customerSession,

Context $context

) {

$this->scopeConfig = $scopeConfig;

$this->context = $context;

$this->_customerSession = $customerSession;

}

/**

* Check if customer group for disable add to cart functionality

* @return bool

public function afterIsSalable(): bool

{

$groupId = $this->scopeConfig->getValue('catalog/customer_group/disable_cutomer_group',\Magento\Framework\App\Config\ScopeConfigInterface::SCOPE_TYPE_DEFAULT);

$customerGroup = $this->_customerSession->getCustomer()->getGroupId();

if($customerGroup == $groupId)

{

return false;

}

return true;

}

You have to follow the above steps to achieve the functionality of disabling add to cart for a particular customer group.

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