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