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

Results forapi.staging.payitforwards.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2021-07-05T07:36:42.864	2021-07-05T06:36:42	2021-10-03T06:36:41	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3
2021-07-05T07:36:42.706	2021-07-05T06:36:42	2021-10-03T06:36:41	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3
2021-05-06T08:34:52.094	2021-05-06T07:34:51	2021-08-04T07:34:51	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3
2021-05-06T08:34:51.894	2021-05-06T07:34:51	2021-08-04T07:34:51	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3
2021-04-21T03:56:28.645	2021-04-21T02:56:28	2021-07-20T02:56:28	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3
2021-04-21T03:56:28.441	2021-04-21T02:56:28	2021-07-20T02:56:28	staging.payitforwards.com	api.staging.payitforwards.com	C=US, O=Let's Encrypt, CN=R3