$endpoints = array(
    'fistkey' => 'firstlabel',
    'secondkey' => 'secondlabel'
);

function pa_custom_endpoint_keys() {

    $endpoints = array(
        'fistkey' => 'firstlabel',
        'secondkey' => 'secondlabel'
    );
    foreach ($endpoints as $key => $value) {
        $endpointsdata[$key] = $value;
    }
    return $endpointsdata;
}

add_action('init', 'pa_custom_endpoint');

function pa_custom_endpoint() {
    $endpoints = array(
        'fistkey' => 'firstlabel',
        'secondkey' => 'secondlabel'
    );
    foreach ($endpoints as $endpointkey => $endpointlable) {
        add_rewrite_endpoint($endpointkey, EP_ROOT | EP_PAGES);
        if (!get_option('plugin_permalinks_flushed')) {

            flush_rewrite_rules(false);
            update_option('plugin_permalinks_flushed', 1);
        }
    }
}

add_filter('query_vars', 'pa_custom_endpoint_query_vars', 0);

function pa_custom_endpoint_query_vars($vars) {
    $endpoints = array(
        'fistkey' => 'firstlabel',
        'secondkey' => 'secondlabel'
    );
    foreach ($endpoints as $endpointkey => $endpointlable) {
        $vars[] = $endpointkey;
    }
    return $vars;
}

add_filter('woocommerce_account_menu_items', 'pa_custom_endpoint_link_my_account');

function pa_custom_endpoint_link_my_account($items) {
    $endpoints = array(
        'fistkey' => 'firstlabel',
        'secondkey' => 'secondlabel'
    );
    foreach ($endpoints as $endpointkey => $endpointlable) {
        $items[$endpointkey] = $endpointlable;
    }
    return $items;
}

function mine($endpointlable) {//i just need to make this function like this $mine(){}
    global $wp;
    $request = explode('/', $wp->request);
    $myaccount_current_endpoint = end($request);
    var_dump($myaccount_current_endpoint);
    exit;
    //echo do_shortcode(' /* your shortcode here  ');
}

foreach ($endpoints as $endpointkey => $endpointlable) {

    add_action('woocommerce_account_' . $endpointkey . '_endpoint', 'mine');
}