Retrieve Checkout Session

{
    "id": "cs_1A2B3C4D5E6F7G8H",
    "object": "checkout.session",
    "mode": "subscription",
    "ui_mode": "custom",
    "status": "open",
    "payment_status": "unpaid",
    "amount": 99.99,
    "currency": "USD",
    "merchant_order_id": "sub_order_jkl345mno678",
    "customer_id": "cus_9Z8Y7X6W5V4U3T",
    "customer": {
        "id": "cus_9Z8Y7X6W5V4U3T",
        "email": "trial@example.com",
        "name": "Trial User",
        "phone": "+1234567890",
        "merchant_customer_id": "cust_trial_merchant_345678"
    },
    "line_items": [
        {
            "quantity": 1,
            "price_data": {
                "product_data": {
                    "name": "Premium Monthly Plan",
                    "desc": "Unlimited access with first month discount"
                },
                "unit_amount": 99.99,
                "currency": "USD",
                "recurring": {
                    "interval": "month",
                    "interval_count": 1,
                    "total_billing_cycles": 12
                }
            }
        }
    ],
    "subscription_data": {
        "discount_period_config": {
            "discount_period_count": 1,
            "discount_period_amount": 0.01
        }
    },
    "collection_method": "auto_charge",
    "payment_method_types": [
        "card",
        "apple_pay",
        "google_pay"
    ],
    "payment_intent_id": null,
    "subscription": null,
    "invoice_id": null,
    "metadata": {
        "subscription_type": "premium",
        "billing_cycle": "monthly",
        "trial_offer": "first_month_99_percent_off"
    },
    "client_secret": "cs_1A2B3C4D5E6F7G8H_secret_abc123",
    "created": 1705228800,
    "expires_at": "2026-01-15T15:30:00Z"
}