Create Appointment via REST

Here is a short piece of Javascript code on how to create an appointment in CRM 2013 through REST.
I'm using CRMRestKit library to simplify the code.

	function CreateNextAppointmentRequest(nextdate, accountid, listRequired) {
	var retval;
	appointment = new Object();
	appointment.ScheduledStart = RealDolmen.DateToCRMFormat(nextdate);
	if (accountid.id != null) {
	appointment.RegardingObjectId = { Id: accountid.id, LogicalName: accountid.typename };
	}
	CrmRestKit.Create('Appointment', appointment, false).then(function (data) {
	retval = data.d.ActivityId;
	// The ActivityParties can't be stored directly into the Appointment activity,
	// therefor we need to create and link them to the activity afterwards
	for (var i = 0; i < listRequired.length; i++) {
	var attendee = new Object();
	attendee.PartyId = { Id: listRequired[i].id, LogicalName: listRequired[i].typename };
	attendee.ParticipationTypeMask = { Value: 5 }; // https://msdn.microsoft.com/en-us/library/gg328549.aspx
	attendee.ActivityId = { Id: retval, LogicalName: "appointment" };
	CrmRestKit.Create('ActivityParty', attendee, false).then(function (data) { }, RealDolmen.onRestError);
	}
	// The ActivityParties can't be stored directly into the Appointment activity,
	// therefor we need to create and link them to the activity afterwards
	var organizer = new Object();
	organizer.PartyId = { Id: Xrm.Page.context.getUserId(), LogicalName: "systemuser" };
	organizer.ParticipationTypeMask = { Value: 7 }; // https://msdn.microsoft.com/en-us/library/gg328549.aspx
	organizer.ActivityId = { Id: retval, LogicalName: "appointment" };
	CrmRestKit.Create('ActivityParty', organizer, false).then(function (data) { }, RealDolmen.onRestError);
	}, RealDolmen.onRestError);
	return retval;
	}
	function onRestError(xhr, status, errorThrown) {
	var msg = JSON.parse(xhr.responseText).error.message.value;
	alert('Rest error: ' + msg);
	},

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