diff --git a/backend/sync_server/src/server.rs b/backend/sync_server/src/server.rs
index b7d8bbf..c0b8073 100644
--- a/backend/sync_server/src/server.rs
+++ b/backend/sync_server/src/server.rs
@@ -23,6 +23,7 @@ mod fetch_latest_document_version;
 mod fetch_latest_documents;
 mod ping;
 mod requests;
+mod responses;
 mod update_document;
 
 pub async fn create_server(app_state: AppState) -> Result<()> {
diff --git a/backend/sync_server/src/server/ping.rs b/backend/sync_server/src/server/ping.rs
index 30f5c74..5d60829 100644
--- a/backend/sync_server/src/server/ping.rs
+++ b/backend/sync_server/src/server/ping.rs
@@ -4,8 +4,8 @@ use axum_extra::{
     TypedHeader,
 };
 
-use super::auth::auth;
-use crate::{app_state::AppState, database::models::PingResponse, errors::SyncServerError};
+use super::{auth::auth, responses::PingResponse};
+use crate::{app_state::AppState, errors::SyncServerError};
 
 #[axum::debug_handler]
 pub async fn ping(
diff --git a/backend/sync_server/src/server/responses.rs b/backend/sync_server/src/server/responses.rs
new file mode 100644
index 0000000..a869b0e
--- /dev/null
+++ b/backend/sync_server/src/server/responses.rs
@@ -0,0 +1,18 @@
+use schemars::JsonSchema;
+use serde::{self, Serialize};
+
+use crate::database::models::{DocumentVersionWithoutContent, VaultUpdateId};
+
+#[derive(Debug, Clone, Serialize, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct PingResponse {
+    pub server_version: String,
+    pub is_authenticated: bool,
+}
+
+#[derive(Debug, Clone, Serialize, JsonSchema)]
+#[serde(rename_all = "camelCase")]
+pub struct FetchLatestDocumentsResponse {
+    pub latest_documents: Vec<DocumentVersionWithoutContent>,
+    pub last_update_id: VaultUpdateId,
+}