curl --request GET \
  --url https://api.example.com/api/v1/checkout-sessions/{id} \
  --header 'Authorization: Bearer <token>'

{
  "session": {
    "checkout_type": "SELF_SERVE",
    "created_at": "2023-11-07T05:31:56Z",
    "customer_id": "<string>",
    "id": "<string>",
    "plan_version_id": "<string>",
    "status": "CREATED",
    "billing_day_anchor": 123,
    "billing_start_date": "2023-12-25",
    "checkout_url": "<string>",
    "completed_at": "2023-11-07T05:31:56Z",
    "coupon_code": "<string>",
    "expires_at": "2023-11-07T05:31:56Z",
    "net_terms": 123,
    "payment_methods_config": {
      "type": "online",
      "config": {
        "card": {
          "enabled": true
        },
        "direct_debit": {
          "enabled": true
        }
      }
    },
    "subscription_id": "sub_7n42DGM5Tflk9n8mt7Fhc7",
    "trial_duration_days": 123
  }
}