diff --git a/shared/tunnelbroker_messages/src/lib.rs b/shared/tunnelbroker_messages/src/lib.rs
--- a/shared/tunnelbroker_messages/src/lib.rs
+++ b/shared/tunnelbroker_messages/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod messages;
 
 pub use messages::*;
+pub use send_confirmation::*;
diff --git a/shared/tunnelbroker_messages/src/messages/mod.rs b/shared/tunnelbroker_messages/src/messages/mod.rs
--- a/shared/tunnelbroker_messages/src/messages/mod.rs
+++ b/shared/tunnelbroker_messages/src/messages/mod.rs
@@ -2,11 +2,13 @@
 pub mod keys;
 pub mod message_to_device;
 pub mod message_to_device_request;
+pub mod send_confirmation;
 pub mod session;
 
 pub use keys::*;
 pub use message_to_device::*;
 pub use message_to_device_request::*;
+pub use send_confirmation::*;
 pub use session::*;
 
 use serde::{Deserialize, Serialize};
@@ -21,4 +23,5 @@
   // the first matching pattern it encounters.
   MessageToDeviceRequest(MessageToDeviceRequest),
   MessageToDevice(MessageToDevice),
+  MessageToDeviceRequestStatus(MessageToDeviceRequestStatus),
 }
diff --git a/shared/tunnelbroker_messages/src/messages/send_confirmation.rs b/shared/tunnelbroker_messages/src/messages/send_confirmation.rs
new file mode 100644
--- /dev/null
+++ b/shared/tunnelbroker_messages/src/messages/send_confirmation.rs
@@ -0,0 +1,86 @@
+// Message sent from Tunnelbroker to WebSocket clients to inform that message
+// was processed, saved in DDB and will be delivered.
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, PartialEq, Debug)]
+pub struct Failure {
+  pub id: String,
+  pub error: String,
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Debug)]
+#[serde(tag = "type", content = "data")]
+pub enum MessageSentStatus {
+  /// The message with the provided ID (String) has been processed
+  /// by the Tunnelbroker and is queued for delivery.
+  Success(String),
+  /// 'Failure' contains information about the message ID
+  /// along with the specific error message.
+  Error(Failure),
+  /// The request was invalid (e.g., Bytes instead of Text).
+  /// In this case, the ID cannot be retrieved.
+  InvalidRequest,
+  /// The JSON could not be serialized, which is why the entire message is
+  /// returned back.
+  /// It becomes impossible to retrieve the message ID in such circumstances.
+  SerializationError(String),
+}
+
+#[derive(Serialize, Deserialize, PartialEq, Debug)]
+#[serde(tag = "type", rename_all = "camelCase")]
+pub struct MessageToDeviceRequestStatus {
+  #[serde(rename = "clientMessageIDs")]
+  pub client_message_ids: Vec<MessageSentStatus>,
+}
+
+#[cfg(test)]
+mod send_confirmation_tests {
+  use super::*;
+
+  #[test]
+  fn test_send_confirmation_deserialization() {
+    let example_payload = r#"{
+          "type": "MessageToDeviceRequestStatus",
+          "clientMessageIDs": [
+            {"type": "Success", "data": "id123"},
+            {"type": "Success", "data": "id456"},
+            {"type": "Error", "data": {"id": "id789", "error": "Something went wrong"}},
+            {"type": "SerializationError", "data": "message"},
+            {"type": "InvalidRequest"}
+          ]
+        }"#;
+
+    let request =
+      serde_json::from_str::<MessageToDeviceRequestStatus>(example_payload)
+        .unwrap();
+
+    let expected_client_message_ids = vec![
+      MessageSentStatus::Success("id123".to_string()),
+      MessageSentStatus::Success("id456".to_string()),
+      MessageSentStatus::Error(Failure {
+        id: String::from("id789"),
+        error: String::from("Something went wrong"),
+      }),
+      MessageSentStatus::SerializationError("message".to_string()),
+      MessageSentStatus::InvalidRequest,
+    ];
+
+    assert_eq!(request.client_message_ids, expected_client_message_ids);
+  }
+
+  #[test]
+  fn test_send_confirmation_deserialization_empty_vec() {
+    let example_payload = r#"{
+          "type": "MessageToDeviceRequestStatus",
+          "clientMessageIDs": []
+        }"#;
+
+    let request =
+      serde_json::from_str::<MessageToDeviceRequestStatus>(example_payload)
+        .unwrap();
+    let expected_client_message_ids: Vec<MessageSentStatus> = Vec::new();
+
+    assert_eq!(request.client_message_ids, expected_client_message_ids);
+  }
+}