App Submission: How do I validate that the merchant owns the provided email address?

Hey, quick question reg. my app submission

In the app submission guidelines it says that
“Your app must validate that the merchant owns the provided email address.”
link: https://shopify.dev/apps/store/requirements#a-authentication

How should I do this? By sending some kind of verification link to their email that they should click? If so, which existing solution can I leverage to do this?

Context:
I don’t myself ask for the merchants email address during signup. Instead, I use Shopify’s API to fetch the Store based on the current session. This store-object contains the email address. I assume Shopify has already validated this email - so should I also validate it? And is this even the right way to retrieve the merchant’s email?

Thank you for your help.

/ Jakob

The requirement is totally unclear.