Do I enter my Google API key in the header or query parameter?

I am trying to create an API key to integrate Flutterlow with a Google Sheets database... I have created an API key, but (as a true rookie/novice), I have been unsuccessful in my attempts to define an API call within Flutterflow.

Do I enter my Google API key in the header or query parameter?... and how do I do this? I have the API key,... and pretty sure I have the correct API url, but keeps rejecting:

{

"error": {

"code": 403,

"message": "The request is missing a valid API key.",

"status": "PERMISSION_DENIED"

}

}

What are the fields that I need to complete and what is the command I need to make (and in what field) to have the API key be recognized?

Sorry... I am a true rookie/novice... any help would be incredibly appreciated!

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