Join a group via invite code

curl --request POST \
  --url https://api.wappfy.io/api/instances/{instanceId}/groups/join \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>"
}
'

{
  "id": "[email protected]",
  "subject": "Team Chat",
  "participants": [
    {
      "id": "[email protected]",
      "admin": "admin"
    }
  ],
  "creation": 1707350400,
  "description": "<string>",
  "pictureUrl": "<string>"
}