How to work with Invoice API create a customer payment?

I am trying to cal an API to create a customer Payment.

My Code is

<%{

authToken = "<myauthtoken>";

invoiceMap = { "invoice_id" : "489509000000031013", "amount_applied" : "10100", "tax_amount_withheld" : "" };

baseUrl = "https://invoice.zoho.com/api/v3/customerpayments";

jsonMap = { "customer_id" : "489509000000030001", "invoices" : "[" + invoiceMap + "]", "payment_mode" : "Cash", "description" : "", "date" : "2014-03-27", "exchange_rate" : 1, "amount" : "10100", "bank_charges" : "" };

requestMap = { "authtoken" : authToken, "JSONString" : jsonMap.toString(), "scope" : "ZohoInvoice/invoiceapi" };

responseMap = postUrl(baseUrl, requestMap,false);

responseCode = responseMap.get("responseCode");

responseText = responseMap.get("responseText");%>

<%=responseCode%><br/>

<%=responseText%><%}%>

but the response is

Can anyone help me and if I am doing anything wrong please let me know

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