curl --request GET \
  --url https://api.hubapi.com/crm-object-schemas/2026-03/schemas \
  --header 'Authorization: Bearer <token>'

{
  "results": [
    {
      "allowsSensitiveProperties": true,
      "archived": true,
      "associations": [
        {
          "fromObjectTypeId": "<string>",
          "id": "<string>",
          "toObjectTypeId": "<string>",
          "createdAt": "2023-11-07T05:31:56Z",
          "name": "<string>",
          "updatedAt": "2023-11-07T05:31:56Z"
        }
      ],
      "fullyQualifiedName": "<string>",
      "id": "<string>",
      "labels": {
        "plural": "<string>",
        "singular": "<string>"
      },
      "name": "<string>",
      "objectTypeId": "<string>",
      "properties": [
        {
          "description": "<string>",
          "fieldType": "<string>",
          "groupName": "<string>",
          "label": "<string>",
          "name": "<string>",
          "options": [
            {
              "hidden": true,
              "label": "<string>",
              "value": "<string>",
              "description": "<string>",
              "displayOrder": 123
            }
          ],
          "type": "<string>",
          "archived": true,
          "archivedAt": "2023-11-07T05:31:56Z",
          "calculated": true,
          "calculationFormula": "<string>",
          "createdAt": "2023-11-07T05:31:56Z",
          "createdUserId": "<string>",
          "dataSensitivity": "highly_sensitive",
          "dateDisplayHint": "absolute",
          "displayOrder": 123,
          "externalOptions": true,
          "formField": true,
          "hasUniqueValue": true,
          "hidden": false,
          "hubspotDefined": true,
          "modificationMetadata": {
            "archivable": true,
            "readOnlyDefinition": true,
            "readOnlyValue": true,
            "readOnlyOptions": true
          },
          "referencedObjectType": "<string>",
          "sensitiveDataCategories": [
            "<string>"
          ],
          "showCurrencySymbol": true,
          "updatedAt": "2023-11-07T05:31:56Z",
          "updatedUserId": "<string>"
        }
      ],
      "requiredProperties": [
        "<string>"
      ],
      "searchableProperties": [
        "<string>"
      ],
      "secondaryDisplayProperties": [
        "<string>"
      ],
      "createdAt": "2023-11-07T05:31:56Z",
      "createdByUserId": 123,
      "description": "<string>",
      "primaryDisplayProperty": "<string>",
      "updatedAt": "2023-11-07T05:31:56Z",
      "updatedByUserId": 123
    }
  ]
}