whitelisting rest api endpoints via filter hook

In the faq I’m trying to follow the suggestion in “How do I whitelist other REST API endpoint? (via filter hook)”.

I see a call to add_filter where should I place this? in functions.php?

Is allow_my_endpoints defined somewhere?

And the anonymous function

function ($allowed_endpoints ) {
    $allowed_endpoints[] = '/my-endpoint';
    return $allowed_endpoints;
};

how should this interact with the filter hook?

(also the example seems to be invalid php, the anonymous function lacks a trailing semicolon, small things like this set beginners back a lot of time.)

• This topic was modified 6 years, 1 month ago by morenoh149.
• This topic was modified 6 years, 1 month ago by morenoh149.

The page I need help with: [log in to see the link]