curl --request POST \
  --url https://qall.io/api/assistants/{assistant_id}/documents/assign \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "document_ids": [
    123
  ]
}
'

import requests

url = "https://qall.io/api/assistants/{assistant_id}/documents/assign"

payload = { "document_ids": [123] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "message": "<string>",
  "success": true,
  "data": {}
}

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}