diff --git a/citadel-internal-service-types/src/messaging_layer.rs b/citadel-internal-service-types/src/messaging_layer.rs
new file mode 100644
index 0000000..0c5a1b6
--- /dev/null
+++ b/citadel-internal-service-types/src/messaging_layer.rs
@@ -0,0 +1,30 @@
+use serde::{Deserialize, Serialize};
+use crate::InternalServiceResponse;
+
+
+pub enum MessengerUpdate {
+    Message { message: CWMessage },
+    Other { response: InternalServiceResponse },
+}
+
+#[derive(Serialize, Deserialize)]
+pub enum CWProtocolMessage {
+    Message { message: CWMessage },
+    MessageAck { id: u64 },
+    Poll { ids: Vec<u64> },
+    PollResponse { messages: Vec<CWMessage> },
+}
+
+pub struct OutgoingCWMessage {
+    pub cid: u64,
+    pub peer_cid: Option<u64>,
+    pub contents: Vec<u8>,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct CWMessage {
+    pub id: u64,
+    pub cid: u64,
+    pub peer_cid: Option<u64>,
+    pub contents: Vec<u8>,
+}
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