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

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

const fee = await client.orders.fees.update('or_UkLWZg9DAJ', 'fee_UkLWZg9DAJ', {
  label: 'Gift wrap',
  amount: '5.00',
})

spree api patch /orders/{order_id}/fees/{id} -d '{"label":"Gift wrap","amount":"5.00"}'

{
  "id": "fee_UkLWZg9DAJ",
  "label": "Handling",
  "kind": "handling",
  "line_item_id": null,
  "fulfillment_id": null,
  "amount": "8.00",
  "metadata": {},
  "created_at": "2026-01-15T12:00:00.000Z",
  "updated_at": "2026-01-15T12:00:00.000Z"
}