I would like to use this for a service of mine once it has an API (added my email in the list). But if I send a link that has no relevant images on its page, I

I would like to use this for a service of mine once it has an API (added my email in the list). But if I send a link that has no relevant images on its page, I would prefer to receive no image (or maybe the favicon image) than a unrelated, keyword-matched stock image.