FaceBook Graph API responds with "Provide valid app ID" error when sending an HTTP request

In the documentation it is not told to include page_id in the request but this error says to provide a valid application id:

{
  "error": {
    "message": "(#200) Provide valid app ID",
    "type": "OAuthException",
    "code": 200,
    "fbtrace_id": "AA23cGCw0PM8uPLrX2SdyhS"
  }
}

I want to see which apps have installed Pages in webhook meta with this function

def cek_subs_app_webhook(page_id, access_token):
    url = f"https://graph.facebook.com/{page_id}/subscribed_apps"
    payload = {
        'access_token': access_token
    }
    get = requests.get(url, data= payload)
    return get.json()

and execute the function with this FastAPI app

@router.get("/cek-subs-app/{page_id}")
async def check(page_id: str, access_token: str = Header(..., description="meta token")):
    response = cek_subs_app_webhook(page_id, access_token)
    return JSONResponse (response)

You are passing the access_token as a Form parameter, when using the data argument in Python requests. If you would like to add the access_token to the query string instead (i.e., as a query parameter), you should use the params argument. Example:

q_params= {'access_token': access_token}
r = requests.get(url, params=q_params)

Alternatively, you could add the access_token to the headers, similar to this answer.

I would highly recommend using httpx instead of requests; especially, if you are going to define the endpoint with async def. Please have at this answer, as well as this answer for more details and examples.