To verify the subdomain stape.example.com for the Conversions API Gateway hub, please log in to your DNS provider and create a CNAME record:

Name: stape (or any word or set of letters you like)
Content/Target: you can find it in your CAPI Gateway on your Stape account(when creating a record, specify the url without https://).
DNS proxy should be set to off.

The record should look like this (just an example):

*The target url depends on the server you have chosen for your CAPI Gateway hosting and can be found in your CAPI Gateway on Stape.