Not able to get custom attribute data from Autodesk BIM360 for data management API

Question

Not able to get custom attribute data from Autodesk BIM360 for data management API - https://forge.autodesk.com/en/docs/data/v2/reference/http/projects-project_id-folders-folder_id-contents-GET/

When I was trying to get all data available in a specific project with a specific folder, but I didn't get the custom attribute data in that. I also need custom attribute data for the file included in that folder. Whereas I am able to get only data and included values with missing custom attribute values. Also in the API custom attribute values are missing. please find it below.

data": [
    {
      "type": "folders",
      "id": "urn:adsk.wipprod:dm.folder:hC6k4hndRWaeIVhIjvHu8w",
      "attributes": {
        "name": "Plans",
        "displayName": "Plans",
        "createTime": "2015-11-27T11:11:23.000Z",
        "createUserId": "BW9RM76WZBGL",
        "createUserName": "John Doe",
        "lastModifiedTime": "2015-11-27T11:11:27.000Z",
        "lastModifiedTimeRollup": "2015-11-27T11:11:27.000Z",
        "lastModifiedUserId": "BW9RM76WZBGL",
        "lastModifiedUserName": "John Doe",
        "path": "/dm-test-root/f0cb4ba0-7722-0133-9814-0eeb7bad1e3b",
        "objectCount": 4,
        "hidden": false,
        "extension": {
          "type": "folders:autodesk.bim360:Folder",
          "version": "1.0",
          "schema": {
            "href": "/schema/v1/versions/folders%3Aautodesk.bim360%3AFolder-1.0"
          },
          "data": {
            "allowedTypes": [
              "folders",
              "items:autodesk.bim360:File",
              "items:autodesk.bim360:Document",
              "items:autodesk.bim360:TitleBlock"
            ],
            "visibleTypes": [
              "folders",
              "items:autodesk.bim360:Document"
            ],
            "namingStandardIds": []
          }
        }

I would like to save custom attributes with their values also. Please find the image of the custom attribute with their values in the format of rows and colums

Answer 1

To get custom attributes of the document in BIM360, you will need to use another endpoint (Version:Batch:Get). This blog tells more. https://forge.autodesk.com/blog/custom-attributes-apis-bim-360-document-are-now-public-beta

While please note, since March 23, 2021, in the newly created project, custom attributes definitions are created in project level (previously, in folder level), although you could still use the endpoint above to access the custom attributes, there is a gap that no endpoint yet to get definitions of project level. This blog tells more: https://forge.autodesk.com/blog/custom-attributes-projects-created-and-after-march-23-2021