curl --request POST \
  --url 'https://api.stateset.com/api/v1/checkout_sessions/{checkout_session_id}/cancel' \
  --header 'Authorization: Bearer YOUR_API_KEY'

{
  "created_at": "string",
  "customer": null,
  "fulfillment": null,
  "id": "string",
  "items": [
    {
      "id": "string",
      "image_url": null,
      "quantity": 1,
      "sku": null,
      "title": "string",
      "unit_price": {
        "amount": null,
        "currency": null
      },
      "variant_id": null
    }
  ],
  "links": null,
  "messages": null,
  "status": "string",
  "totals": {
    "discount": null,
    "grand_total": {
      "amount": 1,
      "currency": "string"
    },
    "shipping": null,
    "subtotal": {
      "amount": 1,
      "currency": "string"
    },
    "tax": null
  },
  "updated_at": "string"
}