Generate headers made as static method

Author: idjuric

src/main/java/com/telesign/PhoneIdClient.java

@@ -1,17 +1,24 @@
 package com.telesign;
 
 import java.io.IOException;
+import java.io.UnsupportedEncodingException;
 import java.net.Proxy;
 import java.security.GeneralSecurityException;
 import java.util.Map;
 
+import okhttp3.MediaType;
+import okhttp3.RequestBody;
+import com.google.gson.Gson;;
+
 /**
  * A set of APIs that deliver deep phone number data attributes that help optimize the end user
  * verification process and evaluate risk.
  */
 public class PhoneIdClient extends RestClient {
 
     private static final String PHONEID_RESOURCE = "/v1/phoneid/%s";
+    
+    public static final MediaType JSON = MediaType.parse("application/json"); // ; charset=utf-8 
 
     public PhoneIdClient(String customerId, String apiKey) {
         super(customerId, apiKey);
@@ -37,10 +44,22 @@ public PhoneIdClient(String customerId,
      * The PhoneID API provides a cleansed phone number, phone type, and telecom carrier information to determine the
      * best communication method - SMS or voice.
      * <p>
-     * See https://developer.telesign.com/docs/phoneid-api for detailed API documentation.
+     * See https://developer.te
+     * lesign.com/docs/phoneid-api for detailed API documentation.
      */
-    public TelesignResponse phoneid(String phoneNumber, Map<String, String> params) throws IOException, GeneralSecurityException {
+    public TelesignResponse phoneid(String phoneNumber, Map<String, ? extends Object> params) throws IOException, GeneralSecurityException {
 
         return this.post(String.format(PHONEID_RESOURCE, phoneNumber), params);
-    }
+   }
+   
+   @Override 
+   public RequestBody createRequestBody(Map<String, ? extends Object> params) throws UnsupportedEncodingException {
+	   String jsonString = (new Gson()).toJson(params);
+	   return params != null ? RequestBody.create(PhoneIdClient.JSON, jsonString.getBytes()) : RequestBody.create(PhoneIdClient.JSON, "");      
+   }
+   
+   @Override
+   protected String getContentType() {
+	   return "application/json";
+   }
 }