Invalid Value Passed in customer_name API

Hello,

I am trying to send data from zoho creator to zoho books, while doing that it throws me an error

{"code":4,"message":"Invalid value passed for Customer Name"}

This is the code:

void BooksIntegration()
{
mapp = Map();
mapp.put("contact_name","Bhavik");
dataa = Map();
dataa.put("data",mapp);
head = Map();
head.put("Authorization","Zoho-oauthtoken 1000.xxxx " );
addRecords = invokeurl
[
url :"https://books.zoho.in/api/v3/contacts?organization_id=60002432254"
type :POST
parameters:dataa.tostring()
headers:head
];
info addRecords;
}

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