diff --git a/native/native_rust_library/src/lib.rs b/native/native_rust_library/src/lib.rs
--- a/native/native_rust_library/src/lib.rs
+++ b/native/native_rust_library/src/lib.rs
@@ -211,7 +211,9 @@
 }
 
 #[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
 struct UserIDAndDeviceAccessToken {
+  #[serde(rename = "userID")]
   user_id: String,
   access_token: String,
 }