Mryntu

I want to allow the customer to Log in using email or mobile number on the checkout page and the login page.

Note: Mobile number is customer eav attribute.

For Login with the customer, First you need to make mobile number required field in customer Registration form. Whenever customer register, At that time you need to add a field like mobile no. and save that field to Customer registration page.

Now when customer login at that time they enter email id or mobile number. For this you need to override this controller

MagentoCustomerControllerAccountLoginPost

in your module and add code like below, Path should be like: app/code/Vendor/Modulename/Controller/Account/LoginPost.

Now keep below code in your controller,

<?php
namespace VendorModulenameControllerAccount;

use MagentoCustomerModelUrl as CustomerUrl;
use MagentoFrameworkDataFormFormKeyValidator;
use MagentoCustomerModelAccountRedirect as AccountRedirect;

class LoginPost extends MagentoCustomerControllerAccountLoginPost

 public function __construct(
 MagentoFrameworkAppActionContext $context,
 MagentoCustomerModelSession $customerSession,
 MagentoCustomerApiAccountManagementInterface $customerAccountManagement,
 CustomerUrl $customerHelperData,
 Validator $formKeyValidator,
 AccountRedirect $accountRedirect,
 MagentoCustomerModelResourceModelCustomerCollectionFactory $customerFactory
 ) 
 $this->_customerFactory = $customerFactory;
 parent::__construct($context,$customerSession,$customerAccountManagement,$customerHelperData,$formKeyValidator,$accountRedirect);
 

 public function execute()
 

I hope this will help