CreateCheckoutSessionEnvelope

{
    "success": true,
    "data": {
        "cart": {
            "id": "cart_e9fd4b94d7f5d9b3"
        },
        "checkoutSession": {
            "id": "cs_test_a1b2c3d4",
            "url": "https://checkout.stripe.com/c/pay/cs_test_a1b2c3d4"
        }
    },
    "meta": {}
}