Invalid JSON payload received. Unknown field name identified within 'tools[0].google_search_retrieval.dynamic_retrieval_config'. Please verify the field names in your JSON structure.

The 400 Bad Request error you are encountering in the Google API is likely due to several specific reasons related to the structure and content of your request:

1. Invalid JSON Payload: The error messages indicate that the JSON payload you are sending contains unknown or invalid field names. Specifically, the fields "minRelevanceScore", "maxResults", and "maxSnippetsPerResult" within the 'tools.google_search_retrieval.dynamic_retrieval_config' section are not recognized by the API. This suggests that these fields may not be valid parameters for the API endpoint you are using.

2. Malformed Request Syntax: The error could be triggered by a malformed syntax in the request body or headers. Ensuring that the JSON is correctly formatted and adheres to the API's expected structure is crucial. Any typos, incorrect encoding, or misplaced characters can lead to a 400 error.

3. Missing or Incorrectly Formatted Required Fields: The API may require specific fields to be present in the request, and if these fields are missing or not in the recognized format, it can result in a 400 error. For example, if the API expects certain fields to be of a specific type (e.g., integer, string), providing values of the wrong type can cause this error.

In summary, the issue is likely due to the presence of unrecognized or incorrectly formatted fields in the JSON payload of your request.