i can’t get around using json to insert data into an api call.

I tried some simple code but it just doesn’t work

import json
import requests

url = "https://presence.roblox.com/v1/presence/users"
body = json.dumps({"userIds": [1]})

response = requests.post(url, data=body)
presence = response.json()

print(presence)

im trying to set a parameter “userIds” so i can list the ids i want to check with the API, but im just confused.