curl --request GET \
  --url https://api.hubapi.com/content/api/v4/custom_widgets/{id}

{
  "authorAt": 1704317276220,
  "categories": [],
  "contentTags": [],
  "contentTypes": [
    "LANDING_PAGE",
    "SITE_PAGE"
  ],
  "created": 1589381258170,
  "createdById": 5,
  "css": "/* cool CSS */",
  "cssAssets": [],
  "cssCdnUri": "",
  "cssRenderOptions": {
    "async": true
  },
  "default": false,
  "deleted": false,
  "deletedAt": 0,
  "externalJs": [],
  "externalJsRenderOptions": {},
  "extraClasses": "",
  "fields": [
    {
      "allow_new_line": false,
      "default": "Hello world",
      "display_width": null,
      "help_text": "",
      "id": "video_title",
      "label": "Video Title",
      "locked": false,
      "name": "video_title",
      "required": true,
      "show_emoji_picker": false,
      "type": "text",
      "validation_regex": ""
    }
  ],
  "filename": "My Module",
  "folderId": 99988,
  "folderPath": "my-theme/modules",
  "global": false,
  "hostTemplateTypes": [
    "PAGE"
  ],
  "id": 12345678910,
  "inheritedAsset": false,
  "inlineHelpText": "",
  "isAvailableForNewContent": true,
  "isJsModule": false,
  "jsAssets": [],
  "jsRenderOptions": null,
  "messages": {},
  "minifiedCssCdnUri": "https://cdn2.hubspot.net/hub/1234/hub_generated/module_assets/012345678910/987/module_012345678910_My_Module.min.css",
  "moduleId": 12345678910,
  "name": "My Module",
  "otherAssets": [],
  "path": "/my-theme/modules/My Module",
  "placeholder": null,
  "portalId": 1234,
  "previewKey": "WLh7vw4zt8G1fuvBuBTmCQ",
  "purchased": false,
  "schemaVersion": 2,
  "smartObjects": [],
  "smartType": "NOT_SMART",
  "source": "<!-- HTML source -->",
  "tags": [],
  "updated": 1704317276220,
  "updatedById": 1122,
  "writeable": true
}