Adding custom fields to New Order emails

Hi

I am using a Redsys payment platform on our website and when I receive a new order, there are custom fields made with info about the order like Authorization Code, Time of Purchase, etc. To see them, I have to go to WooCommerce>Orders>open an order>Custom Fields section and then find them there.

Here’s how it looks like: https://tinypic.com/r/99ovat/9

One of my colleagues receive the New Order emails and I want the authorization code to be in the New Order email so that when he needs to refund, he can quickly go to the email to find what he needs. I need the authorization code, payment date and and payment hour in the new Order email.

How can I have that?

Thank you very much.