curl --request POST \
  --url https://api.lyceum.technology/api/v2/external/create-checkout-session \
  --header 'Content-Type: application/json' \
  --data '
{
  "amount": 123,
  "currency": "eur",
  "description": "Lyceum Cloud Credits"
}
'

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>"
    }
  ]
}