curl --request POST \
  --url https://api.zapsterapi.com/v1/wa/instances/{instance_id}/groups/join \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '""'

{
  "description": "My group description",
  "id": "120363279776130958",
  "invite_code": "XobOM8UBL8EXR3dXoGozql",
  "is_community": true,
  "is_announcement": true,
  "is_restricted": true,
  "approval_mode": "requires_approval",
  "name": "My group name",
  "owner": {
    "id": "558796139874",
    "name": "Owner Name",
    "profile_picture": "https://zapsterapi.s3.us-east-1.amazonaws.com/..."
  },
  "profile_picture": "https://zapsterapi.s3.us-east-1.amazonaws.com/...",
  "total_participants": 2
}