Finally, after debugging I found the solution
The default postcode can be set by overriding the TaxConfigProvider class. To set it you have to use after plugin.
Step 1: Define plugin in 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"> <type name="Magento\Tax\Model\TaxConfigProvider"> <plugin disabled="false" name="My_Module_Plugin_Frontend_Magento_Tax_Model_TaxConfigProvider" sortOrder="10" type="My\Module\Plugin\Frontend\Magento\Tax\Model\TaxConfigProvider"/> </type> </config>
Step 2: Create a plugin class
<?php namespace My\Module\Plugin\Frontend\Magento\Tax\Model; use Magento\Framework\Stdlib\CookieManagerInterface; class TaxConfigProvider { /** * @var CookieManagerInterface */ private $cookieManager; /** * TaxConfigProvider constructor. * @param CookieManagerInterface $cookieManager */ public function __construct( CookieManagerInterface $cookieManager ) { $this->cookieManager = $cookieManager; } /** * @param \Magento\Tax\Model\TaxConfigProvider $subject * @param $result * @return mixed */ public function afterGetConfig( \Magento\Tax\Model\TaxConfigProvider $subject, $result ) { $result['defaultPostcode'] = $this->cookieManager->getCookie('custom_pincode'); return $result; } }
After implementing this code go to Store –> Configuration –> General –> Country Options here you will find an option of “Zip/Postal Code is Optional for”. Remove the country for which you want to set default zip code from this list otherwise, it will be not filled up in frontend.
