curl -X POST 'https://app.filemonk.io/api/v1/external/orders/a1b2c3d4-e5f6-7890-abcd-ef1234567890/attach_assets' \
  -H 'X-Auth-Token: fm_api_key_your_key_here' \
  -H 'Content-Type: application/json' \
  -d '{
    "asset_ids": [
      "f1e2d3c4-b5a6-7890-fedc-ba0987654321",
      "a9b8c7d6-e5f4-3210-abcd-ef9876543210"
    ]
  }'

const orderId = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890';
const response = await fetch(
  `https://app.filemonk.io/api/v1/external/orders/${orderId}/attach_assets`,
  {
    method: 'POST',
    headers: {
      'X-Auth-Token': 'fm_api_key_your_key_here',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      asset_ids: [
        'f1e2d3c4-b5a6-7890-fedc-ba0987654321',
        'a9b8c7d6-e5f4-3210-abcd-ef9876543210'
      ]
    })
  }
);
const data = await response.json();

import requests

order_id = 'a1b2c3d4-e5f6-7890-abcd-ef1234567890'
response = requests.post(
    f'https://app.filemonk.io/api/v1/external/orders/{order_id}/attach_assets',
    headers={'X-Auth-Token': 'fm_api_key_your_key_here'},
    json={
        'asset_ids': [
            'f1e2d3c4-b5a6-7890-fedc-ba0987654321',
            'a9b8c7d6-e5f4-3210-abcd-ef9876543210'
        ]
    }
)
data = response.json()

{
  "order": {
    "id": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
    "name": "#1042",
    "email": "customer@example.com",
    "phone": "+1234567890",
    "financial_status": "paid",
    "fulfillment_status": null,
    "total_price": "29.99",
    "currency": "USD",
    "created_at": "2026-03-01T14:30:00Z",
    "download_count": 0
  },
  "attached_assets": [
    {
      "id": "f1e2d3c4-b5a6-7890-fedc-ba0987654321",
      "type": "internal",
      "name": "Custom Song - Order 1042",
      "filename": "custom-song-1042.mp3",
      "content_type": "audio/mpeg",
      "byte_size": 5242880
    }
  ]
}

{
  "error": "Order not found"
}

{
  "error": "asset_ids must be a non-empty array"
}