Floot Zapier Webhook POST Failure

I'm having trouble with a POST webhook that keeps failing with the error: "The webhook payload failed validation. This may happen if ChatGPT did not extract certain fields."
 

My Setup:

1. Step 1: Webhook trigger receives data
2. Step 2: ChatGPT extracts metadata from document text
3. Step 3: JavaScript code processes and normalizes the data
4. Step 4: POST webhook sends data to my API endpoint

The Problem: Step 4's data field contains malformed JSON that creates invalid payload structure:

{{{_GEN_1759900537463__payload_json}}}
  "filingId": {{325615454__filingId}},
  "metadata": {
    "Title": "{{325648144__output_json__Title}}",
    "UtilityCompany": "{{325648144__output_json__UtilityCompany}}",
    ...
  }
}

This creates invalid JSON like: json {"filingId":123,"metadata":{...existing object...}} "filingId": 123, "metadata": { "Title": "...", ...duplicate structure... } }

What I Expected: Step 3 already generates a complete, properly formatted payload_json that should be sent directly.

Question: Should Step 4's data field simply be {{step3__payload_json}} instead of manually reconstructing the JSON? The current setup appears to be duplicating the JSON structure and creating malformed payload.

Any help would be appreciated!