curl --location --request POST 'https://api.orlipera.cz/newsletter/preview/' \
--data-urlencode 'id=' \
--data-urlencode 'email=' \
--data-urlencode 'token=' \
--data-urlencode 'client=www' \
--data-urlencode 'ip=' \
--data-urlencode 'sid='
{
"isOK": true,
"message": "string",
"retMessageObject": {},
"jsonExternalData": "string"
}