Add a button to the main single hero actions in Listify. Add 'button-secondary' class to change the color to the accent color.

functions.php

<?php
/**
 * Plugin Name: Listify - Custom Single Listing Hero Button
 */

function custom_listify_single_job_listing_actions_after() {
    global $post;

    // Get URL.
    $url = get_post_meta( $post->ID, 'your_custom_meta_key', true );

    // Get checkbox (ticket button enabled)
    $enabled = get_post_meta( $post->ID, 'ticket_button', true );

    // Check if URL exists and ticket button enabled.
    if ( $url && $enabled ) {
        echo '<a href="' . esc_url( $url ) . '" class="button">My Button</a>';
    }
}
add_filter( 'listify_single_job_listing_actions_after', 'custom_listify_single_job_listing_actions_after' );