curl --request GET \
  --url https://api.plazza.ca/v1/roadmapBoards/{board}/items/{item}/viewerStates:batchGet \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.plazza.ca/v1/roadmapBoards/{board}/items/{item}/viewerStates:batchGet', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.plazza.ca/v1/roadmapBoards/{board}/items/{item}/viewerStates:batchGet"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

{
  "viewerStates": [
    {
      "name": "roadmapBoards/hire/items/019a7c2e-4b1d-7c3a-9d4e-5f6a7b8c9d0e/viewerState",
      "voted": true,
      "followed": false,
      "owned": false
    }
  ]
}

{
  "error": {
    "code": 401,
    "message": "Unauthorized",
    "status": "UNAUTHENTICATED",
    "details": [
      {
        "@type": "type.googleapis.com/google.rpc.ErrorInfo",
        "reason": "MISSING_CREDENTIALS",
        "domain": "api.plazza.ca"
      },
      {
        "@type": "type.googleapis.com/google.rpc.LocalizedMessage",
        "locale": "en",
        "message": "Sign in to continue."
      }
    ]
  }
}