curl --request GET \
  --url https://api.hubapi.com/crm/v3/imports/ \
  --header 'Authorization: Bearer <token>'

{
  "paging": {
    "next": {
      "link": "",
      "after": ""
    },
    "prev": {
      "before": "",
      "link": ""
    }
  },
  "results": [
    {
      "importTemplate": {
        "templateType": "admin_defined",
        "templateId": 123
      },
      "createdAt": "2020-01-14T22:45:00.153+00:00",
      "metadata": {
        "counters": "{\"TOTAL_ROWS\":2,\"CREATED_OBJECTS\":1,\"UPDATED_OBJECTS\":1,\"UNIQUE_OBJECTS_WRITTEN\":2,\"PROPERTY_VALUES_EMITTED\":2}",
        "fileIds": "[\"3579849\"]",
        "objectLists": "[{\"listId\":\"3\",\"objectType\":\"contacts\"}]"
      },
      "importRequestJson": {},
      "importSource": "API",
      "importName": "<string>",
      "state": "DONE",
      "id": "1471",
      "optOutImport": false,
      "mappedObjectTypeIds": [
        "<string>"
      ],
      "updatedAt": "2020-01-14T22:45:00.153+00:00"
    }
  ]
}