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

Results forwww.checkouts-api.dev.samcart.dev

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2023-09-06T17:56:36.929	2023-09-06T16:56:36	2023-12-05T16:56:35	checkouts-api.dev.samcart.dev	checkouts-api.dev.samcart.dev	C=US, O=Let's Encrypt, CN=R3
2023-09-06T17:56:36.566	2023-09-06T16:56:36	2023-12-05T16:56:35	checkouts-api.dev.samcart.dev	checkouts-api.dev.samcart.dev	C=US, O=Let's Encrypt, CN=R3
2023-08-21T16:54:04.998	2023-08-21T15:54:04	2023-11-19T15:54:03	checkouts-api.dev.samcart.dev	checkouts-api.dev.samcart.dev	C=US, O=Let's Encrypt, CN=R3
2023-08-21T16:54:04.784	2023-08-21T15:54:04	2023-11-19T15:54:03	checkouts-api.dev.samcart.dev	checkouts-api.dev.samcart.dev	C=US, O=Let's Encrypt, CN=R3