<cfscript>
payments = [
[{amt: 1}, {amt: 1}, {amt: 1}],
[{amt: 1}, {amt: 1}],
[{amt: 1}]
];

function sumInvoiceAmounts(require array invoices) {
    return invoices.reduce(function (subtotal, invoice) {
		return subtotal + invoice.amt;
	}, 0);
}
function sumPaymentInvoices(required array payments) {
	return payments.reduce(function (total, invoices) {
	    //var fml =
		return total + sumInvoiceAmounts(invoices);
	}, 0);
}
writeDump(sumPaymentInvoices(payments))
</cfscript>