Hey Hari!
In your API Enrichment, you would put https://logo.clearbit.com/{domain column}
but replace domain column with the exact name of the column containing the domains.
So if your domains are in a column called Company Domain then it will look like this:
https://logo.clearbit.com/{Company Domain}
The {curly braces} are what you use to indicate that something should be referencing a column.
Let me know if that works!