area: home
action: adduser
https://api.hypermail.com/api.php?apikey=YOURAPIKEYHERE&area=home&action=adduser&username=test&password=mypassword&firstname=john&lastname=smith&address=123 Main Street&city=Chicago&region=illinois&zip=60149&country=US
<response>
<success>User Added</success>
<userid>1</userid>
</response>
{
"success": "User Added",
"userid": "1"
}