curl --request GET \
  --url https:/api.autosend.com/v1/contacts/{id}/unsubscribe-groups \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "data": {
    "groups": [
      {
        "groupId": "20XWO",
        "name": "Our blog"
      }
    ]
  }
}