ServiceDesk REST API How to get all accounts?

Hey, guys.

I'm attempting an API request for tickets. Specifically I wanted all tickets assigned to me but I haven't figured out which filter to use for that yet.

Most importantly, I'm getting an issue when I perform a request that I need to specify an account, when I specify an account, I need to specify a site. I want to run my query against all clients, not a specific one. Is there a way to do this?

The function I'm using to query the data is:
$.post(manageEngine_URL + "/sdpapi/request/?API_KEY=" + manageEngine_Key + "&OPERATION_NAME=GET_REQUESTS&INPUT_DATA=<details><account>All_Accounts</account><from>0</from><limit>5</limit><filterby>Open_User</filterby></details> ", function(data, status){
console.log(data);
});

The result:
<message>Account with the specified name not found</message>