3.2. Localize Route and Create Nonce

localize-route.php

<?php
function localize_route() {    
    wp_localize_script( 'initiative-tracker-frontend-script', 'initTracker', [
        'route' => 'rave-initiative/v1/initiative',
    ] );
}
add_action( 'wp_enqueue_scripts', 'localize_route' );