curl --request PUT \
  --url https://api.shoppex.io/dev/v1/orders/{id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "referral_code": "creator123"
}
'

{
  "data": {
    "id": "inv_put_1",
    "uniqid": "dddddddd-dddd-4ddd-8ddd-dddddddddddd",
    "shop_id": "shop_1",
    "customer_id": null,
    "customer_email": "[email protected]",
    "affiliate_link_id": "link_1",
    "affiliate_customer_id": "cus_aff_1",
    "affiliate_code": "creator123",
    "affiliate_discount_amount": 0,
    "currency": "USD",
    "status": "PENDING",
    "payment_status": "PENDING",
    "gateway": "MANUAL",
    "flow_type": "MANUAL_CONFIRMATION",
    "provider_reference": "ref_put_1",
    "provider_reference_type": "MANUAL_REFERENCE",
    "subtotal": 10,
    "discount": 0,
    "total": 10,
    "custom_fields": null,
    "checkout_url": null,
    "items": [
      {
        "product_id": "prod_1",
        "product_title": "Starter Pack",
        "product_type": "SERVICE",
        "variant_title": null,
        "quantity": 1,
        "unit_price": 10,
        "total": 10
      }
    ],
    "created_at": 1711956000,
    "updated_at": 1711956300
  }
}