Using HTTP API for NPI Registry in Clay: Need Help!

Hi everyone, I just got access to Enterprise, and I’m also fairly new to Clay. I was wondering if anyone here has experience using enrichment via the “HTTP API” feature. For a bit of context: I’m trying to call the NPI Registry API, but when I set up the API call in Clay, it doesn’t prompt me to specify which field it should use to search for data. Has anyone run into this or know how to set it up properly? Thanks in advance