// Define the workflow
const workflow = {
  "nodes": [
    {
      "id": "upload_image",
      "type": "http",
      "dependencies": [],
      "http": {
        "method": "PUT",
        "url": "https://storage.example.com/{{ context.filename }}",
        "headers": {
          "Content-Type": "{{ context.contentType }}",
          "Authorization": "Bearer {{ $secret('storage_token') }}"
        },
        "body": "{{ context.imageData }}"
      },
      "activityConfig": {
        "retryPolicy": {
          "maximumAttempts": 3,
          "initialInterval": "1s",
          "backoffCoefficient": 2
        },
        "startToCloseTimeout": "30 seconds"
      }
    },
    {
      "id": "generate_thumbnails",
      "type": "http",
      "dependencies": ["upload_image"],
      "http": {
        "method": "POST",
        "url": "https://images.example.com/process",
        "body": {
          "source": "{{ results.upload_image.data.url }}",
          "sizes": ["400x400", "200x200"]
        }
      }
    },
    {
      "id": "update_cdn",
      "type": "http",
      "dependencies": ["generate_thumbnails"],
      "http": {
        "method": "POST",
        "url": "https://cdn.example.com/assets",
        "body": {
          "images": "{{ results.generate_thumbnails.data.images }}",
          "contentType": "{{ context.contentType }}"
        }
      }
    }
  ],
  "context": {
    "filename": "profile.jpg",
    "contentType": "image/jpeg"
  }
}

// Execute via API
fetch("https://api.graphcompose.io/v1/workflows/execute", {
  method: "POST",
  headers: {
    "Content-Type": "application/json",
    "Authorization": "Bearer YOUR_API_KEY"
  },
  body: JSON.stringify(workflow)
})