curl --request GET \
  --url https://api.hubapi.com/integrations/v1/{application-id}/timeline/event-types

[
  {
    "id": 1,
    "name": "Event Type Name",
    "headerTemplate": null,
    "detailTemplate": null,
    "objectType": "CONTACT",
    "applicationId": 123
  },
  {
    "id": 74,
    "name": "Another Event Type",
    "headerTemplate": null,
    "detailTemplate": null,
    "objectType": "COMPANY",
    "applicationId": 123
  }
]