Force vendor to accept new terms

gistfile1.php

<?php 

add_action('wp_login','check_terms_accepted');

//check if user has accepted the terms when logging in
function check_terms_accepted($login) {
     
     $user = get_user_by('login', $login);

     $terms_accepted = get_user_meta( $user->ID, 'new_terms');
     $msg = 'Please Accept our new Terms'; 

     if($user->has_cap('vendor') && !$terms_accepted) {
          wp_redirect(get_option('siteurl') . '/somepage-template/?msg=$msg');
          exit();
     }
}

//run this function when a user tries to load a page
add_action('pre_get_posts','check_terms_accepted_page');

//check if user has accepted the terms before loading a page
function check_terms_accepted_page() {
    
    if(is_user_logged_in()) {   
          if(is_page() && !is_page('somepage-template') && !is_admin()) {               
               $user_id = get_current_user_id();
               $user = new WP_User($user_id);

               $terms_accepted = get_user_meta( $user_id, 'new_terms' );
               $msg = 'Please Accept our new Terms'; 

               if($user->has_cap('vendor') && !$terms_accepted) {
	          		wp_redirect(get_option('siteurl') . '/somepage-template/?msg='.$msg);
	          		exit();
     		   }
          } 
     }
}

// You will then need a page called somepage-template that loads a template that has the terms and a bit of code to set the user meta 'new_terms' to true. 
// It'll have a form with 'accept the terms' submit button. On submit, save the new_terms user meta. 
?>

<?php 

/**
 * Template Name: Terms
 *
 * @package WordPress
 */

global $current_user; 
$user_id = $current_user->ID; 


if(isset($_POST['submitted'])) {
     // The form has been submitted so they have agreed. 
     update_user_meta( $user_id, 'new_terms', true );
}

get_header(); ?>

<?php while ( have_posts() ) : the_post(); ?>
 
          <!-- Page Title -->
          <?php the_title(); ?>
          
           <?php if (!is_user_logged_in()) { 

               // Send them to their account if they haven't logged in. 
               wp_redirect(get_option('siteurl').'/my-account/'); 

                } else  {  
                    // Get their role to make sure they are a vendor 
                    $current_user_role = strtolower(get_user_role($user_id)); 

                    // if they are a vendor and the form hasn't been submitted. 
                    if ($current_user_role == 'vendor' && !isset($_POST['submitted'])) { ?>

                         <!-- The content would be the terms -->
                         <?php the_content(); ?>
                   
                         <!-- Form with accept button. You could put tick box and check -->
                         <form action="<?php the_permalink(); ?>" method="post">
                              <input type="submit" name="submit" value="Accept Terms" />
                             
                         </form>
                  
                    <?php } ?>
               <?php } ?>

          <?php } ?> 
 
<?php endwhile; // end of the loop. ?>  


<?php get_footer(); ?>