PHP - Wordpress Metabox.io ajax fetch custom taxonomy metadata

wp-mb-tax-admin.php

/**
// -------------------------
// Fetch Taxonomy Term & Meta
// -------------------------
// GOAL: When a user selects a taxonomy term (from a MetaBox.io field) this helps fetch 
// the term & it's metadata and returns JSON so the JS can load it into a Custom HTML block
// -------------------------
// FORUM - https://metabox.io/support/topic/show-data-from-related-post-term-after-selection/
// PHP - https://gist.github.com/21fed6266453de7ba76b3d2bc0e5a06f
// JS - https://gist.github.com/3b636d0c7e55ce6dc58ceba3de9a974e
// -------------------------
 **/

// Gets meta data for a term and returns JSON
function get_json_term_meta()
{
    global $wpdb;
    $termID  = isset($_GET['termID']) ? $_GET['termID'] : false;
    $field  = isset($_GET['field']) ? $_GET['field'] : false;
    if (!empty($termID)) {
        if (empty($field)) {
            $data = get_term_meta($termID);
            $term = get_term($termID);
            // add the term name
            $data['term_name'] = [$term->name];
            if (!empty($data['related_customer'])) {
                $relCustomer = get_term($data['related_customer'][0]);
                // add the customer name
                $data['related_customer_name'] = [$relCustomer->name];
            }
        } else {
            $data = get_term_meta($termID, $field);
        }
        echo wp_send_json($data);
    }
    wp_die();
}

add_action('wp_ajax_get_json_term_meta', 'get_json_term_meta');

// Gets a term and returns JSON
function get_json_term()
{
    global $wpdb;
    $termID  = isset($_GET['termID']) ? $_GET['termID'] : false;
    $field  = isset($_GET['field']) ? $_GET['field'] : false;
    if (!empty($termID)) {
        if (empty($field)) {
            $data = get_term($termID);
        } else {
            $data = get_term($termID, $field);
        }
        echo wp_send_json($data);
    }
    wp_die();
}

add_action('wp_ajax_get_json_term', 'get_json_term');