curl -i -X GET "https://api.box.com/2.0/collections/926489/items" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

client.collections.get_collection_items(favourite_collection.id)

await client.collections.getCollectionItems(favouriteCollection.id!);

try await client.collections.getCollectionItems(collectionId: favouriteCollection.id!)

await client.Collections.GetCollectionItemsAsync(collectionId: NullableUtils.Unwrap(favouriteCollection.Id));

{
  "total_count": 5000,
  "limit": 1000,
  "offset": 2000,
  "order": [
    {
      "by": "type",
      "direction": "ASC"
    }
  ],
  "entries": [
    {
      "id": "12345",
      "type": "file",
      "etag": "1",
      "sequence_id": "3",
      "name": "Contract.pdf",
      "sha1": "85136C79CBF9FE36BB9D05D0639C70C265C18D37",
      "file_version": {
        "id": "12345",
        "type": "file_version",
        "sha1": "134b65991ed521fcfe4724b7d814ab8ded5185dc"
      },
      "description": "Contract for Q1 renewal",
      "size": 629644,
      "path_collection": {
        "total_count": 1,
        "entries": [
          {
            "id": "12345",
            "type": "folder",
            "etag": "1",
            "sequence_id": "3",
            "name": "Contracts"
          }
        ]
      },
      "created_at": "2012-12-12T10:53:43-08:00",
      "modified_at": "2012-12-12T10:53:43-08:00",
      "trashed_at": "2012-12-12T10:53:43-08:00",
      "purged_at": "2012-12-12T10:53:43-08:00",
      "content_created_at": "2012-12-12T10:53:43-08:00",
      "content_modified_at": "2012-12-12T10:53:43-08:00",
      "created_by": {
        "id": "11446498",
        "type": "user",
        "name": "Aaron Levie",
        "login": "ceo@example.com"
      },
      "modified_by": {
        "id": "11446498",
        "type": "user",
        "name": "Aaron Levie",
        "login": "ceo@example.com"
      },
      "owned_by": {
        "id": "11446498",
        "type": "user",
        "name": "Aaron Levie",
        "login": "ceo@example.com"
      },
      "shared_link": {
        "url": "https://www.box.com/s/vspke7y05sb214wjokpk",
        "effective_access": "company",
        "effective_permission": "can_download",
        "is_password_enabled": true,
        "download_count": 3,
        "preview_count": 3,
        "download_url": "https://www.box.com/shared/static/rh935iit6ewrmw0unyul.jpeg",
        "vanity_url": "https://acme.app.box.com/v/my_url/",
        "vanity_name": "my_url",
        "access": "open",
        "unshared_at": "2018-04-13T13:53:23-07:00",
        "permissions": {
          "can_download": true,
          "can_preview": true,
          "can_edit": false
        }
      },
      "parent": {
        "id": "12345",
        "type": "folder",
        "etag": "1",
        "sequence_id": "3",
        "name": "Contracts"
      },
      "item_status": "active",
      "version_number": "1",
      "comment_count": 10,
      "permissions": {
        "can_delete": true,
        "can_download": true,
        "can_invite_collaborator": true,
        "can_rename": true,
        "can_set_share_access": true,
        "can_share": true,
        "can_annotate": true,
        "can_comment": true,
        "can_preview": true,
        "can_upload": true,
        "can_view_annotations_all": true,
        "can_view_annotations_self": true,
        "can_apply_watermark": true
      },
      "tags": [
        "approved"
      ],
      "lock": {
        "id": "11446498",
        "type": "lock",
        "created_by": {
          "id": "11446498",
          "type": "user",
          "name": "Aaron Levie",
          "login": "ceo@example.com"
        },
        "created_at": "2012-12-12T10:53:43-08:00",
        "expired_at": "2012-12-12T10:53:43-08:00",
        "is_download_prevented": true,
        "app_type": "office_wopiplus"
      },
      "extension": "pdf",
      "is_package": true,
      "expiring_embed_link": {
        "access_token": "c3FIOG9vSGV4VHo4QzAyg5T1JvNnJoZ3ExaVNyQWw6WjRsanRKZG5lQk9qUE1BVQ",
        "expires_in": 3600,
        "token_type": "bearer",
        "restricted_to": [
          {
            "scope": "item_download",
            "object": {
              "id": "12345",
              "type": "folder",
              "etag": "1",
              "sequence_id": "3",
              "name": "Contracts"
            }
          }
        ],
        "url": "https://cloud.app.box.com/preview/expiring_embed/..."
      },
      "watermark_info": {
        "is_watermarked": true,
        "is_watermark_inherited": false,
        "is_watermarked_by_access_policy": false
      },
      "is_accessible_via_shared_link": true,
      "allowed_invitee_roles": [
        "editor"
      ],
      "is_externally_owned": true,
      "has_collaborations": true,
      "metadata": {
        "enterprise_27335": {
          "marketingCollateral": {
            "$canEdit": true,
            "$id": "01234500-12f1-1234-aa12-b1d234cb567e",
            "$parent": "folder_59449484661",
            "$scope": "enterprise_27335",
            "$template": "marketingCollateral",
            "$type": "properties-6bcba49f-ca6d-4d2a-a758-57fe6edf44d0",
            "$typeVersion": 2,
            "$version": 1
          }
        }
      },
      "expires_at": "2012-12-12T10:53:43-08:00",
      "representations": {
        "entries": [
          {
            "content": {
              "url_template": "https://dl.boxcloud.com/api/2.0/internal_files/123/versions/345/representations/png_paged_2048x2048/content/{+asset_path}?watermark_content=4567"
            },
            "info": {
              "url": "https://api.box.com/2.0/internal_files/123/versions/345/representations/png_paged_2048x2048"
            },
            "properties": {
              "dimensions": "2048x2048",
              "paged": "true",
              "thumb": "true"
            },
            "representation": "png",
            "status": {
              "state": "success"
            }
          }
        ]
      },
      "classification": {
        "name": "Top Secret",
        "definition": "Content that should not be shared outside the company.",
        "color": "#FF0000"
      },
      "uploader_display_name": "Ellis Wiggins",
      "disposition_at": "2012-12-12T10:53:43-08:00",
      "shared_link_permission_options": [
        "can_preview"
      ],
      "is_associated_with_app_item": true,
      "collections": [
        {
          "id": "11446498",
          "type": "collection",
          "name": "Favorites",
          "collection_type": "favorites"
        }
      ],
      "is_download_available": true,
      "download_url": "https://dl.boxcloud.com/d/1/example_token/download",
      "authenticated_download_url": "https://api.box.com/2.0/files/12345/content",
      "allowed_shared_link_access_levels": [
        "open"
      ]
    }
  ]
}

{
  "type": "error",
  "status": 400,
  "code": "item_name_invalid",
  "message": "Method Not Allowed",
  "context_info": {
    "message": "Something went wrong"
  },
  "help_url": "https://developer.box.com/guides/api-calls/permissions-and-errors/common-errors/",
  "request_id": "abcdef123456"
}