Magento2 Checkout shipping address autofill. If you want to Magento2 Checkout shipping address autofill during checkout then you have to use Magento 2 plugin. I have used plugin over on Class below classes for autofill checkout Shipping address: Magento\Checkout\Block\Checkout\AttributeMerger is  main classis the main class where i able to auto fill firstname,lastname,street,city,postcode,country_id,region,region_id,telephone,companyabove fields value using after Create after Plugin (Devbera\AutofillCheckoutAddress\Plugin\Magento\Checkout::afterMerge ) on Magento\Checkout\Block\Checkout\AttributeMerger::merge for shipping address fields autofill up. Step1:Define Plugin classes: First Create di.xml at app/code/{VendorName}/{ModuleName}/etc/frontent where we are define the plugin classes. Code Step2: Declare plugin class Create First plugin class AttributeMergerPlugin.php at app/code/{VendorName}/{ModuleName}/Plugin/Magento/Checkout/ Code Second plugin class which will auto fill email id for NON _login customer Create seocnf…