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

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

const order = await client.orders.discountCodes.create('or_UkLWZg9DAJ', {
  code: 'SUMMER20',
})

spree api post /orders/{order_id}/discount_codes -d '{"code":"SUMMER20"}'

{
  "id": "or_UkLWZg9DAJ",
  "market_id": "mkt_UkLWZg9DAJ",
  "withdrawal_period_ends_at": null,
  "within_withdrawal_period": false,
  "shipping_eq_billing_address": false,
  "cart_id": null,
  "channel_id": "ch_UkLWZg9DAJ",
  "company_id": null,
  "company_name": null,
  "po_document_filename": null,
  "po_document_byte_size": null,
  "number": "R1001",
  "email": "larue@gerlachoga.biz",
  "customer_note": null,
  "po_number": null,
  "currency": "USD",
  "locale": "en",
  "total_quantity": 1,
  "coupon_code": "save5",
  "fulfillment_status": null,
  "payment_status": null,
  "completed_at": null,
  "item_total": "50.00",
  "discount_total": "-5.00",
  "tax_total": "0.00",
  "included_tax_total": "0.00",
  "additional_tax_total": "0.00",
  "delivery_total": "100.00",
  "fee_total": "0.00",
  "gift_card_total": "0.00",
  "store_credit_total": "0.00",
  "total": "145.00",
  "amount_due": "145.00",
  "covered_by_store_credit": false,
  "adjustment_total": "-5.00",
  "gift_card": null,
  "market": {
    "id": "mkt_UkLWZg9DAJ",
    "name": "United States",
    "currency": "USD",
    "default_locale": "en",
    "tax_inclusive": false,
    "default": true,
    "country_codes": [
      "US"
    ],
    "supported_locales": [
      "en"
    ],
    "created_at": "2026-01-15T12:00:00.000Z",
    "updated_at": "2026-01-15T12:00:00.000Z",
    "tax_provider": null
  },
  "external_references": {},
  "status": "draft",
  "last_ip_address": null,
  "considered_risky": false,
  "confirmation_delivered": false,
  "store_owner_notification_delivered": null,
  "metadata": {},
  "cancel_note": null,
  "canceled_at": null,
  "approved_at": null,
  "created_at": "2026-01-15T12:00:00.000Z",
  "updated_at": "2026-01-15T12:00:00.000Z",
  "payment_total": "0.00",
  "commission_amount_total": "0.00",
  "commission_tax_total": "0.00",
  "commission_total": "0.00",
  "preferred_stock_location_id": null,
  "po_document_url": null,
  "seller_id": null,
  "order_group_id": null,
  "tags": [],
  "internal_note": null,
  "internal_note_html": null,
  "approver_id": null,
  "approver_type": null,
  "canceler_id": null,
  "canceler_type": null,
  "created_by_id": null,
  "created_by_type": null,
  "cancel_reason_id": null,
  "cancel_reason_name": null,
  "customer_id": "cust_UkLWZg9DAJ",
  "freight_summary": null
}

{
  "error": {
    "code": "processing_error",
    "message": "The coupon code you entered doesn't exist. Please try again."
  }
}