https://hostname.example.com:2087/cpsess###########/json-api/cpanel?cpanel_jsonapi_user=user&cpanel_jsonapi_apiversion=2&cpanel_jsonapi_module=MysqlFE&cpanel_jsonapi_func=createdbuser&dbuser=example_user1&password=12345luggage

$cpanel = new CPANEL(); // Connect to cPanel - only do this once.
 
// Creates the database user "example_user1"
$create_user = $cpanel->api2(
    'MysqlFE', 'createdbuser', 
    array(
        'dbuser'   => 'example_user1',
        'password' => '12345luggage',
 ) 
);

my $cpliveapi = Cpanel::LiveAPI->new(); # Connect to cPanel - only do this once.
 
# Creates the database user "example_user1"
my $create_user = $cpliveapi->api2(
    'MysqlFE', 'createdbuser',
    { 
        'dbuser'   => 'example_user1',
        'password' => '12345luggage',
    }
);

cpapi2 --user=username MysqlFE createdbuser dbuser=example_user1 password=12345luggage

 {
  "cpanelresult": {
    "apiversion": 2,
    "data": [
      1
    ],
    "func": "createdbuser",
    "event": {
      "result": 1
    },
    "module": "MysqlFE"
  }
}