It can be anything! An apex, subdomain, or even a URL.

Results forwww.promo-code-dev.wekeep.app

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-12-02T23:14:37.546	2020-12-02T22:14:37	2021-03-02T22:14:37	www.promo-code-dev.wekeep.app	www.promo-code-dev.wekeep.app	C=US, O=Let's Encrypt, CN=R3
2020-12-02T23:14:37.253	2020-12-02T22:14:37	2021-03-02T22:14:37	www.promo-code-dev.wekeep.app	www.promo-code-dev.wekeep.app	C=US, O=Let's Encrypt, CN=R3
2020-12-02T23:12:14.462	2020-12-02T22:12:11	2021-03-02T22:12:11	promo-code-dev.wekeep.app	promo-code-dev.wekeep.app	C=US, O=Let's Encrypt, CN=R3
2020-12-02T23:12:12.698	2020-12-02T22:12:11	2021-03-02T22:12:11	promo-code-dev.wekeep.app	promo-code-dev.wekeep.app	C=US, O=Let's Encrypt, CN=R3