Send reminder to emails from custom checkout fields

Hi,

I’m trying to achieve something that I cannot grasp and also can’t seem to find someone who had the same goal.

I run an escaperoom and on the checkoutpage I created several input fields for my customer to put their attendees’ email adresses. So far so good.

I’m also collecting them as part of the metadata of my orders. So far so good.

For every reservation that’s made I schedule a follow-up mail to ask them for a review. What I’d like to do is send that same email to all those attendees as well.

How do I hook those email adresses into that same action?

Kind regards,

Daaf