import { createAdminClient } from '@spree/admin-sdk'

const client = createAdminClient({
  baseUrl: 'https://your-store.com',
  secretKey: 'sk_xxx',
})

const carton = await client.packageTypes.update('pkgtype_123', {
  max_weight: 25,
})

spree api patch /package_types/{id} -d '{"max_weight":25}'

{
  "id": "pkgtype_UkLWZg9DAJ",
  "name": "Master carton",
  "kind": "carton",
  "length": "40.0",
  "width": "30.0",
  "height": "25.0",
  "weight": null,
  "max_weight": "25.0",
  "default": false,
  "metadata": {},
  "created_at": "2026-01-15T12:00:00.000Z",
  "updated_at": "2026-01-15T12:00:00.000Z",
  "dimensions_unit": "cm",
  "weight_unit": "kg",
  "volume": "0.03",
  "seller_id": null,
  "seller_name": null
}