Send Unique Coupon Code on Every New Subscriber

Here you have to override the Subscriber Model so for that, you have to create a new module and override the Subscriber model?

If the answer is yes, then please do the below steps.

Step 1: Paste the below code in your di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <preference for="Magento\Newsletter\Model\Subscriber" type="Magemonkey\Newsletter\Model\Subscriber" />
		
</config>

<?xml version="1.0"?>

</config>

Step 2: Paste the below code in Your Subscriber.php under Magemonkey/Newsletter/Model/Subscriber.php

<?php

namespace Magemonkey\Newsletter\Model;

use \Magento\Framework\App\ObjectManager;

class Subscriber extends \Magento\Newsletter\Model\Subscriber
{
    /**
     * @var \Magento\Customer\Model\GroupFactory
     */
    protected $_customerGroup;

    /**
     * @var \Magento\Store\Model\Website
     */
    protected $_website;

    /**
     * @var \Magento\SalesRule\Model\Rule
     */
    protected $_salesRule;

    /**
     * Sends out confirmation success email
     *
     * @return $this
     */
    public function sendConfirmationSuccessEmail()
    {
        
        
        if ($this->getImportMode()) {
            return $this;
        }

        if (!$this->_scopeConfig->getValue(
            self::XML_PATH_SUCCESS_EMAIL_TEMPLATE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        ) || !$this->_scopeConfig->getValue(
            self::XML_PATH_SUCCESS_EMAIL_IDENTITY,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        )
        ) {
            return $this;
        }

        $this->inlineTranslation->suspend();

        $this->_transportBuilder->setTemplateIdentifier(
            $this->_scopeConfig->getValue(
                self::XML_PATH_SUCCESS_EMAIL_TEMPLATE,
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            )
           
        )->setTemplateOptions(
            [
                'area' => \Magento\Framework\App\Area::AREA_FRONTEND,
                'store' => $this->_storeManager->getStore()->getId(),
            ]
        )->setTemplateVars(
            ['subscriber' => $this, 'coupon_code' => $this->generateCouponCode()]
        )->setFrom(
            $this->_scopeConfig->getValue(
                self::XML_PATH_SUCCESS_EMAIL_IDENTITY,
                \Magento\Store\Model\ScopeInterface::SCOPE_STORE
            )
        )->addTo(
            $this->getEmail(),
            $this->getName()
        );
        $transport = $this->_transportBuilder->getTransport();
        $transport->sendMessage();

        $this->inlineTranslation->resume();

        return $this;
    }

    /**
     * Retrieve the coupon code
     *
     * @return string
     */
    protected function generateCouponCode()
    {
        try {
            
            /** @var \Magento\SalesRule\Model\Rule $rule */
            $rule = $this->_getSalesRule();
            $couponCode = $rule->getCouponCodeGenerator()->setLength(4)->setAlphabet(
                'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
            )->generateCode().'WELCOME';
            
            /*$rule->loadPost($couponData);
            $rule->save();*/
            $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
            $datetime = $objectManager->get('\Magento\Framework\Stdlib\DateTime');
            $date = $objectManager->get('\Magento\Framework\Stdlib\DateTime\DateTime');
        	$nowTimestamp = $datetime->formatDate($date->gmtTimestamp());
            $coupon = $objectManager->create('\Magento\SalesRule\Model\Coupon')
				->setRuleId(81)
                ->setUsageLimit(NULL)
                ->setUsagePerCustomer(1)
                ->setCreatedAt($nowTimestamp)
                ->setType(\Magento\SalesRule\Helper\Coupon::COUPON_TYPE_SPECIFIC_AUTOGENERATED)
                ->setCode($couponCode)
                ->save();

            return $couponCode;
        } catch (\Exception $e) {
            return null;
        }
    }

    /**
     * Retrieve the customer group ids
     *
     * @return array
     */
    protected function getCustomerGroupIds()
    {
        $groupsIds = [];
        $collection = $this->_getCustomerGroup()->getCollection();
        foreach ($collection as $group) {
            $groupsIds[] = $group->getId();
        }
        return $groupsIds;
    }

    /**
     * Retrieve the website ids
     *
     * @return array
     */
    protected function getWebsiteIds()
    {
        $websiteIds = [];
        $collection = $this->_getWebsite()->getCollection();
        foreach ($collection as $website) {
            $websiteIds[] = $website->getId();
        }
        return $websiteIds;
    }

    /**
     * @return \Magento\Customer\Model\Group
     */
    protected function _getCustomerGroup()
    {
        if ($this->_customerGroup === null) {
            $this->_customerGroup = ObjectManager::getInstance()->get(\Magento\Customer\Model\Group::class);
        }
        return $this->_customerGroup;
    }

    /**
     * @return \Magento\Store\Model\Website
     */
    protected function _getWebsite()
    {
        if ($this->_website === null) {
            $this->_website = ObjectManager::getInstance()->get(\Magento\Store\Model\Website::class);
        }
        return $this->_website;
    }

    /**
     * @return \Magento\SalesRule\Model\Rule
     */
    protected function _getSalesRule()
    {
        if ($this->_salesRule === null) {
            $this->_salesRule = ObjectManager::getInstance()->get(\Magento\SalesRule\Model\Rule::class);
        }
        return $this->_salesRule;
    }
}

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<?php

namespace Magemonkey\Newsletter\Model;

use \Magento\Framework\App\ObjectManager;

class Subscriber extends \Magento\Newsletter\Model\Subscriber

{

/**

* @var \Magento\Customer\Model\GroupFactory

protected $_customerGroup;

/**

* @var \Magento\Store\Model\Website

protected $_website;

/**

* @var \Magento\SalesRule\Model\Rule

protected $_salesRule;

/**

* Sends out confirmation success email

* @return $this

public function sendConfirmationSuccessEmail()

{

if ($this->getImportMode()) {

return $this;

}

if (!$this->_scopeConfig->getValue(

self::XML_PATH_SUCCESS_EMAIL_TEMPLATE,

\Magento\Store\Model\ScopeInterface::SCOPE_STORE

) || !$this->_scopeConfig->getValue(

self::XML_PATH_SUCCESS_EMAIL_IDENTITY,

\Magento\Store\Model\ScopeInterface::SCOPE_STORE

)

) {

return $this;

}

$this->inlineTranslation->suspend();

$this->_transportBuilder->setTemplateIdentifier(

$this->_scopeConfig->getValue(

self::XML_PATH_SUCCESS_EMAIL_TEMPLATE,

\Magento\Store\Model\ScopeInterface::SCOPE_STORE

)

)->setTemplateOptions(

[

'area' => \Magento\Framework\App\Area::AREA_FRONTEND,

'store' => $this->_storeManager->getStore()->getId(),

]

)->setTemplateVars(

['subscriber' => $this, 'coupon_code' => $this->generateCouponCode()]

)->setFrom(

$this->_scopeConfig->getValue(

self::XML_PATH_SUCCESS_EMAIL_IDENTITY,

\Magento\Store\Model\ScopeInterface::SCOPE_STORE

)

)->addTo(

$this->getEmail(),

$this->getName()

);

$transport = $this->_transportBuilder->getTransport();

$transport->sendMessage();

$this->inlineTranslation->resume();

return $this;

}

/**

* Retrieve the coupon code

* @return string

protected function generateCouponCode()

{

try {

/** @var \Magento\SalesRule\Model\Rule $rule */

$rule = $this->_getSalesRule();

$couponCode = $rule->getCouponCodeGenerator()->setLength(4)->setAlphabet(

'ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'

)->generateCode().'WELCOME';

/*$rule->loadPost($couponData);

$rule->save();*/

$objectManager = \Magento\Framework\App\ObjectManager::getInstance();

$datetime = $objectManager->get('\Magento\Framework\Stdlib\DateTime');

$date = $objectManager->get('\Magento\Framework\Stdlib\DateTime\DateTime');

$nowTimestamp = $datetime->formatDate($date->gmtTimestamp());

$coupon = $objectManager->create('\Magento\SalesRule\Model\Coupon')

->setRuleId(81)

->setUsageLimit(NULL)

->setUsagePerCustomer(1)

->setCreatedAt($nowTimestamp)

->setType(\Magento\SalesRule\Helper\Coupon::COUPON_TYPE_SPECIFIC_AUTOGENERATED)

->setCode($couponCode)

->save();

return $couponCode;

} catch (\Exception $e) {

return null;

}

/**

* Retrieve the customer group ids

* @return array

protected function getCustomerGroupIds()

{

$groupsIds = [];

$collection = $this->_getCustomerGroup()->getCollection();

foreach ($collection as $group) {

$groupsIds[] = $group->getId();

}

return $groupsIds;

}

/**

* Retrieve the website ids

* @return array

protected function getWebsiteIds()

{

$websiteIds = [];

$collection = $this->_getWebsite()->getCollection();

foreach ($collection as $website) {

$websiteIds[] = $website->getId();

}

return $websiteIds;

}

/**

* @return \Magento\Customer\Model\Group

protected function _getCustomerGroup()

{

if ($this->_customerGroup === null) {

$this->_customerGroup = ObjectManager::getInstance()->get(\Magento\Customer\Model\Group::class);

}

return $this->_customerGroup;

}

/**

* @return \Magento\Store\Model\Website

protected function _getWebsite()

{

if ($this->_website === null) {

$this->_website = ObjectManager::getInstance()->get(\Magento\Store\Model\Website::class);

}

return $this->_website;

}

/**

* @return \Magento\SalesRule\Model\Rule

protected function _getSalesRule()

{

if ($this->_salesRule === null) {

$this->_salesRule = ObjectManager::getInstance()->get(\Magento\SalesRule\Model\Rule::class);

}

return $this->_salesRule;

}

Here, we have passed the ‘coupon_code’ variable in the template vars.
This variable contains the unique coupon code for every subscriber. Also, we have used the object Manager but you can use the construct method. And we have passed the static RULE id in the code. You can also change the rule id.

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