How to fetch (send) a csv string

RouterOS Scripting
1

I am trying to send a HTTP POST request to a page that has a variable named ‘csv_data’ in it (i.e. $_POST[‘csv_data’]).

Can someone tell me what is wrong with the following script?

:local csv  "login,password,profile,kiosk_id\r\n\
				 i251,vmnt,SW15,IGN002\r\n\
				 i252,asdc,SW15,IGN002"

/tool fetch http-method=post http-content-type="text/plain" output=none http-data="csv_data=$csv" url="http://34.68.190.89/public/accounts.php"