Prefill data into registration form

Hi, i need to pre fill data into registration form.

I created this workflow:

1. User insert name and email into my website in a form created with a marketing automation software
2. I send him an email with a link to a page with simple membership form registration

Into mail message at point 2 i send him an email with a link like this: http://www.mysite.it/community/registrati/?email=name%40example.com&first_name=XXXXXXXX

where obviously name@example.com and XXXXXXXX are mail address and name of the user.

Then i edited “simple-membership/views/add.php” file into plugin editor like this:

<?php SimpleWpMembership::enqueue_validation_scripts(array('ajaxEmailCall' => array('extraData'=>'&action=swpm_validate_email&member_id='.filter_input(INPUT_GET, 'member_id')))); 

$email = isset($_GET["email"]) ? $_GET["email"] : "";
$first_name = isset($_GET["first_name"]) ? $_GET["first_name"] : "";
?>

the problem is that when i upgrade the plugin all new file overwrite my code 🙁

Is there a way to not lose my code or to add a code into plugin to prefill data?

I don’t need it but it could be useful for someone to add a prefill code for last name or username too 🙂
$email = isset($_GET[“email”]) ? $_GET[“email”] : “”;
$first_name = isset($_GET[“first_name”]) ? $_GET[“first_name”] : “”;
$last_name = isset($_GET[“last_name”]) ? $_GET[“last_name”] : “”;
$username = isset($_GET[“username”]) ? $_GET[“username”] : “”;