Input Schema

{
    "type": "object",
    "required": [
        "session_id"
    ],
    "properties": {
        "session_id": {
            "type": "string",
            "description": "Session ID from create_checkout_session"
        },
        "discount_code": {
            "type": "string",
            "description": "Discount code (e.g. '10OFF')"
        },
        "shipping_option_id": {
            "type": "string",
            "description": "'standard-shipping' (free) or 'express-shipping' ($15)"
        }
    }
}