diff --git a/telesign/phoneid.py b/telesign/phoneid.py
index 6cf6ea3..0c014f9 100644
--- a/telesign/phoneid.py
+++ b/telesign/phoneid.py
@@ -1,5 +1,7 @@
 from __future__ import unicode_literals
 
+import json
+
 from telesign.rest import RestClient
 
 PHONEID_RESOURCE = "/v1/phoneid/{phone_number}"
@@ -23,3 +25,30 @@ def phoneid(self, phone_number, **params):
         """
         return self.post(PHONEID_RESOURCE.format(phone_number=phone_number),
                          **params)
+
+    def _execute(self, method_function, method_name, resource, **params):
+        resource_uri = "{api_host}{resource}".format(api_host=self.api_host, resource=resource)
+
+        json_fields = json.dumps(params)
+
+        content_type = "application/json" if method_name in ("POST", "PUT") else ""
+
+        headers = self.generate_telesign_headers(self.customer_id,
+                                                 self.api_key,
+                                                 method_name,
+                                                 resource,
+                                                 json_fields,
+                                                 user_agent=self.user_agent,
+                                                 content_type=content_type)
+
+        if method_name in ['POST', 'PUT']:
+            payload = {'data': json_fields}
+        else:
+            payload = {'params': json_fields}
+
+        response = self.Response(method_function(resource_uri,
+                                                 headers=headers,
+                                                 timeout=self.timeout,
+                                                 **payload))
+
+        return response
diff --git a/telesign/rest.py b/telesign/rest.py
index b53dadd..6833619 100644
--- a/telesign/rest.py
+++ b/telesign/rest.py
@@ -81,7 +81,8 @@ def generate_telesign_headers(customer_id,
                                   url_encoded_fields,
                                   date_rfc2616=None,
                                   nonce=None,
-                                  user_agent=None):
+                                  user_agent=None,
+                                  content_type=None):
         """
         Generates the TeleSign REST API headers used to authenticate requests.
 
@@ -99,6 +100,7 @@ def generate_telesign_headers(customer_id,
         :param date_rfc2616: The date and time of the request formatted in rfc 2616, as a string.
         :param nonce: A unique cryptographic nonce for the request, as a string.
         :param user_agent: (optional) User Agent associated with the request, as a string.
+        :param content_type: (optional) ContentType of the request, as a string.
         :return: The TeleSign authentication headers.
         """
         if date_rfc2616 is None:
@@ -106,8 +108,9 @@ def generate_telesign_headers(customer_id,
 
         if nonce is None:
             nonce = str(uuid.uuid4())
-
-        content_type = "application/x-www-form-urlencoded" if method_name in ("POST", "PUT") else ""
+        
+        if not content_type:
+            content_type = "application/x-www-form-urlencoded" if method_name in ("POST", "PUT") else ""
 
         auth_method = "HMAC-SHA256"