Zillow data - update unique data into Airtable

Hi everyone

I am trying to get the data from rapidapi (Zillow com)

I have used http request to get the data and used the split out node to get the required data such as zpid, area, price.

Now I have 25 items as a output of split out node.
I have to search each item in my airtable and skip the duplicates and create the unique data into my airtable.

I am facing a lot of problem. If I use airtable and use filter to find duplicate. Then for the unique ones, there will be no output of the airtable. After that, I connect the IF node, as for the unique id’s, there is no output from airtable search node so IF node will not be executed.

I tried using merge node but nothing happens.