How To Set Tier Price With Percentage Value Programmatically in Magento 2.x

There are following below steps to create custom module to add or update tier price in Magento2

Here, we are considering as
Namespace / ModuleName = Mage2db/John

Step [1.1] – Create registration.php file under your module [ Namespace / ModuleName ]

File Path=Mage2db/John/registration.php

Add below content in this file.

<?php
\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Mage2db_John',
    __DIR__
);

Step [1.2] – Create module.xml file under your module [ Namespace / ModuleName ]

File Path=Mage2db/John/etc/module.xml

Add below content in this file.

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Mage2db_John" setup_version="1.0.0" />
</config>

Step [2] – Create Index.php file under your module etc directory. Add below content in this file.

File Path=Mage2db/John/Controller/Index/Index.php

Here, we are using below core class to add tier or customer group price
Magento\Catalog\Api\Data\ProductTierPriceInterfaceFactory;
Magento\Catalog\Api\ScopedProductTierPriceManagementInterface;

<?php
namespace Mage2db\John\Controller\Index;

use Magento\Backend\App\Action\Context;
use \Magento\Framework\Controller\ResultFactory;
use Magento\Catalog\Api\Data\ProductTierPriceInterfaceFactory;
use Magento\Catalog\Api\ScopedProductTierPriceManagementInterface;

class Index extends \Magento\Framework\App\Action\Action
{
	
    /**
     * @var \Magento\Framework\App\Cache\TypeListInterface
     */
    protected $_cacheTypeList;

    /**
     * @var \Magento\Framework\App\Cache\StateInterface
     */
    protected $_cacheState;

    /**
     * @var \Magento\Framework\App\Cache\Frontend\Pool
     */
    protected $_cacheFrontendPool;

    /**
     * @var \Magento\Framework\View\Result\PageFactory
     */
    protected $resultPageFactory;
	
	/**
     * @var ScopedProductTierPriceManagementInterface
     */
    private $tierPrice;
 
    /**
     * @var ProductTierPriceInterfaceFactory
     */
    private $productTierPriceFactory;

    /**
     * @param Action\Context $context
     * @param \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList
     * @param \Magento\Framework\App\Cache\StateInterface $cacheState
     * @param \Magento\Framework\App\Cache\Frontend\Pool $cacheFrontendPool
     * @param \Magento\Framework\View\Result\PageFactory $resultPageFactory
     */
    public function __construct(
       \Magento\Framework\App\Action\Context $context,
        \Magento\Framework\App\Cache\TypeListInterface $cacheTypeList,
        \Magento\Framework\App\Cache\StateInterface $cacheState,
        \Magento\Framework\App\Cache\Frontend\Pool $cacheFrontendPool,
        \Magento\Framework\Message\ManagerInterface $messageManager,
        \Magento\Framework\View\Result\PageFactory $resultPageFactory,
		ScopedProductTierPriceManagementInterface $tierPrice,
        ProductTierPriceInterfaceFactory $productTierPriceFactory
    ) {
        parent::__construct($context);
        $this->_cacheTypeList = $cacheTypeList;
        $this->_cacheState = $cacheState;
        $this->_cacheFrontendPool = $cacheFrontendPool;
        $this->resultPageFactory = $resultPageFactory;
        $this->_messageManager = $messageManager;
	$this->tierPrice = $tierPrice;
        $this->productTierPriceFactory =  $productTierPriceFactory;
		
     }
    
    /**
     * Flush cache storage
     *
     */
    public function execute()
    {
	$qty = 2.00;//Quantity must be float value
        $price = 300.00;//Price must be float value
        $customerGroupId = 4; //CustomerGroup ID
        $sku = 'product1021'; //put sku,to add tier price
/*As per your need all above values create dynamically */
        try {
            $tierPriceData = $this->productTierPriceFactory->create();
            $tierPriceData->setCustomerGroupId($customerGroupId)->setQty($qty)->setValue($price);

//Adding Discount Percentage Value
$percentage_value="8.00"; //must be float value
$extensionAttributes = $tierPriceData->getExtensionAttributes();
$extensionAttributes->setPercentageValue($percentage_value);
$tierPriceData->setExtensionAttributes($extensionAttributes);

$tierPrice = $this->tierPrice->add($sku, $tierPriceData);
        } catch (NoSuchEntityException $exception) {
            throw new NoSuchEntityException(__($exception->getMessage()));
        }
		
echo"Tier Price / Customer Group Price, with Quantity, Price, Discount Percentage Value has been updated for SKU=$sku";
exit();
		
  $this->resultPage = $this->resultPageFactory->create();  
        return $this->resultPage;
    }
}

Step [3] – Create routes.xml file under your module etc directory. Add below content in this file.

File Path=Mage2db\John\etc\frontend\routes.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../../lib/internal/Magento/Framework/App/etc/routes.xsd">
   <router id="standard">
       <route id="john" frontName="john">
         <module name="Mage2db_John" />
       </route>
   </router>
</config>

Step [3] – Run URL https://mage2db.com/john/index/index

Change https://mage2db.com to your Base URL.

Finally Tier Price / Customer Group Price, with Quantity, Price, Discount Percentage Value, custom module has been created.

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