import requests

url = "https://api.diga.io/v1/project/invitation/{invitation_id}/join"

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

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

print(response.text)

{
  "name": "<string>",
  "members_count": 123,
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "description": "<string>"
}