curl --request GET \
  --url https://api-sandbox.y.uno/v1/checkout/sessions/{checkout_session_id}

{
  "checkout_session": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "merchant_order_id": "<string>",
  "country": "<string>",
  "payment_description": "<string>",
  "customer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "amount": {
    "currency": "<string>",
    "value": 123
  },
  "workflow": "<string>",
  "created_at": "2023-11-07T05:31:56Z"
}