Restfull WCF service Problem

Question

I have created a WCF restfull service and calling from postman from-data parma-their is problem.

 

can anyone help me how to call it and what will be service param.

 

here is my method 

[OperationContract]

[WebInvoke(

Method = "POST",

RequestFormat = WebMessageFormat.Xml,

ResponseFormat = WebMessageFormat.Xml,

UriTemplate = "/CustomerSave",

BodyStyle = WebMessageBodyStyle.WrappedResponse)]

string CustomerSave(CustomerDataContract parameter);

 I am calling from it this way.