Add a Checkbox to Login Page on a WordPress Website

my_login_page_add_checkbox.php

<?php // Do not copy this line please.

/*
 * Please add the below code to your custom plugin or Code Snippets Plugin by following this guide: https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

	// As part of WP authentication process, call our function
		add_filter('wp_authenticate_user', 'wp_authenticate_user_acc', 10, 2);

	function wp_authenticate_user_acc($user, $password) {
	   // See if the checkbox #login_accept was checked
    if ( isset( $_REQUEST['login_accept'] ) && $_REQUEST['login_accept'] == 'on' ) {
       // Checkbox on, allow login
        return $user;
    } else {
       // Did NOT check the box, do not allow login
        $error = new WP_Error();
        $error->add('did_not_accept', 'You must accept the terms and conditions' );
        return $error;
    }
		}

	// As part of WP login form construction, call our function
		add_filter ( 'login_form_middle', 'login_form_acc' );

	function login_form_acc(){
    // Add an element to the login form, which must be checked
    $termsLink = '<label><input type="checkbox" name="login_accept" id="login_accept" /> I Agree to Site Terms</label>';
    return $termsLink;
	}