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

{
  "created_at": "2026-08-31T14:22:05Z",
  "customer": {
    "billing_address": {
      "city": "San Francisco",
      "country": "US",
      "email": "ada.lovelace@example.com",
      "line1": "548 Market St",
      "line2": "Suite 400",
      "name": "Ada Lovelace",
      "phone": "+1 415 555 0142",
      "postal_code": "94107",
      "region": "CA"
    },
    "shipping_address": {
      "city": "San Francisco",
      "country": "US",
      "email": "ada.lovelace@example.com",
      "line1": "548 Market St",
      "line2": "Suite 400",
      "name": "Ada Lovelace",
      "phone": "+1 415 555 0142",
      "postal_code": "94107",
      "region": "CA"
    }
  },
  "fulfillment": {
    "options": [
      {
        "est_delivery": null,
        "id": null,
        "label": null,
        "price": null
      }
    ],
    "selected_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
  },
  "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
  "items": [
    {
      "id": "3fa85f64-5717-4562-b3fc-2c963f66afa6",
      "image_url": "https://cdn.example.com/products/tent-2p.jpg",
      "quantity": 2,
      "sku": "SKU-TENT-2P-GRN",
      "title": "Replacement tent pole set",
      "unit_price": {
        "amount": null,
        "currency": null
      },
      "variant_id": "3fa85f64-5717-4562-b3fc-2c963f66afa6"
    }
  ],
  "links": {
    "order_permalink": "string",
    "privacy": "string",
    "terms": "string"
  },
  "messages": [
    {
      "code": "string",
      "message": "Two-person tent, green — replacement for damaged pole set.",
      "param": "string",
      "type": "standard"
    }
  ],
  "status": "pending",
  "totals": {
    "discount": {
      "amount": 49,
      "currency": "USD"
    },
    "grand_total": {
      "amount": 49,
      "currency": "USD"
    },
    "shipping": {
      "amount": 49,
      "currency": "USD"
    },
    "subtotal": {
      "amount": 49,
      "currency": "USD"
    },
    "tax": {
      "amount": 49,
      "currency": "USD"
    }
  },
  "updated_at": "2026-08-31T14:22:05Z"
}