How to create and email a product license key to customer after purchase.

I'm not familiar with velo, however I am familiar with coding so I mostly just need some explanation. I am selling software that requires a key to unlock the product. I already have an algorithm to generate a key, however I need to generate the key and then email the customer the newly generated product key. I know wix has the automations section, however I couldn't figure out a way to include a generated key into the email. Any help appreciated! Thanks