$user_id = wp_insert_user(
  array(
    'user_login'  => $input['testeroo'],
    'user_pass' => wp_generate_password ( 12, false ),
    'first_name'  => $input['first_name'],
    'last_name' => $input['last_name'],
    'user_email'  => $input['email_address'],
    'display_name'  => $input['first_name'] . ' ' . $input['last_name'],
    'nickname'  => $input['first_name'] . ' ' . $input['last_name'],
    'role'    => 'None'
  )
);
update_user_meta( $user_id, 'zip_code', $input['zip_code'] );
var_dump($user_id);