curl --request GET \
  --url https://api.zapsterapi.com/v1/wa/instances/{instance_id}/groups \
  --header 'Authorization: Bearer <token>'

[
  {
    "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
  }
]