curl --request PUT \
  --url https://api.example.com/api/v1/architecture/{design_id}/diagrams/{diagram_id}/payload \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "payload": {},
  "change_summary": "<string>",
  "format": "excalidraw_json"
}
'

{
  "board_id": "<string>",
  "created_at": "2023-11-07T05:31:56Z",
  "created_by": "<string>",
  "global_description": "<string>",
  "id": "<string>",
  "parent_id": "<string>",
  "parent_type": "ideation",
  "title": "<string>",
  "updated_at": "2023-11-07T05:31:56Z",
  "version": 123,
  "breaking_change_flag": false,
  "diagrams": [
    {
      "title": "<string>",
      "adapter_payload": {},
      "adapter_payload_ref": "<string>",
      "content_hash": "<string>",
      "description": "<string>",
      "diagram_type": "other",
      "format": "raw",
      "id": "<string>",
      "order_index": 0,
      "preview_ref": "<string>",
      "render_metadata": {},
      "size_bytes": 123,
      "source_diagram_id": "<string>",
      "source_payload_ref": "<string>"
    }
  ],
  "entities": [
    {
      "name": "<string>",
      "boundaries": "<string>",
      "entity_type": "<string>",
      "id": "<string>",
      "notes": "<string>",
      "relationships": [
        "<string>"
      ],
      "responsibility": "<string>",
      "technologies": [
        "<string>"
      ]
    }
  ],
  "interfaces": [
    {
      "name": "<string>",
      "contract_type": "<string>",
      "description": "<string>",
      "direction": "<string>",
      "endpoint": "<string>",
      "error_contract": {},
      "event_schema": {},
      "id": "<string>",
      "notes": "<string>",
      "participants": [
        "<string>"
      ],
      "protocol": "<string>",
      "request_schema": {},
      "response_schema": {},
      "schema_ref": "<string>"
    }
  ],
  "requires_arch_review": false,
  "source_design_id": "<string>",
  "source_ref": "<string>",
  "source_version": 123,
  "stale": false
}