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

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

// Line-item discount; omit line_item_id to distribute across the order.
const { data: discounts } = await client.orders.discounts.create('or_abc123', {
  label: 'Customer appeasement',
  value: '10',
  value_type: 'flat',
  line_item_id: 'item_abc123',
})

spree api post /orders/{order_id}/discounts -d '{"label":"Customer appeasement","value":"10","value_type":"flat","line_item_id":"item_abc123"}'

{
  "data": [
    {
      "id": "disc_UkLWZg9DAJ",
      "label": "Appeasement",
      "kind": "manual",
      "code": null,
      "value_type": "flat",
      "value": "3.00",
      "promotion_id": null,
      "line_item_id": "li_UkLWZg9DAJ",
      "fulfillment_id": null,
      "amount": "-3.00",
      "metadata": {},
      "created_at": "2026-01-15T12:00:00.000Z",
      "updated_at": "2026-01-15T12:00:00.000Z"
    }
  ]
}

{
  "error": {
    "code": "invalid_money_format",
    "message": "value must be a decimal string like \"19.99\"",
    "details": {
      "value": [
        "must be a decimal string like \"19.99\""
      ]
    }
  }
}