diff --git a/src/twilio/api/types/mod.rs b/src/twilio/api/types/mod.rs
index 3a3e78e..e5f22ba 100644
--- a/src/twilio/api/types/mod.rs
+++ b/src/twilio/api/types/mod.rs
@@ -3,20 +3,28 @@ pub struct TwilioAPIMessage {
     pub account_sid: String,
     pub api_version: String,
     pub body: String,
-    // pub date_created: time::OffsetDateTime,
+    #[serde(with = "time::serde::rfc3339::option")]
+    pub date_created: Option<time::OffsetDateTime>,
+    #[serde(with = "time::serde::rfc3339::option")]
     pub date_sent: Option<time::OffsetDateTime>,
+    #[serde(with = "time::serde::rfc3339::option")]
     pub date_updated: Option<time::OffsetDateTime>,
     pub direction: String,
     // Not definite of what type this is
-    pub error_code: Option<String>,
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub error_code: String,
     // Not definite of what type this is
-    pub error_message: Option<String>,
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub error_message: String,
     pub from: String,
     pub messaging_service_sid: String,
     pub num_media: String,
     pub num_segments: String,
-    pub price: Option<String>,
-    pub price_unit: Option<String>,
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub price: String,
+    #[serde(skip_serializing_if = "String::is_empty")]
+    pub price_unit: String,
+    #[serde(skip_serializing_if = "String::is_empty")]
     pub sid: String,
     pub status: String,
     pub subresource_uris: SubresourceURI,