diff --git a/src/inventory/application/port/output/db/customization_id_exists.rs b/src/inventory/application/port/output/db/customization_id_exists.rs
new file mode 100644
index 0000000..a5bf068
--- /dev/null
+++ b/src/inventory/application/port/output/db/customization_id_exists.rs
@@ -0,0 +1,57 @@
+// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
+//
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use mockall::predicate::*;
+use mockall::*;
+use uuid::Uuid;
+
+use super::errors::*;
+#[cfg(test)]
+#[allow(unused_imports)]
+pub use tests::*;
+
+#[automock]
+#[async_trait::async_trait]
+pub trait CustomizationIDExistsDBPort: Send + Sync {
+    async fn customization_id_exists(&self, c: &Uuid) -> InventoryDBResult<bool>;
+}
+
+pub type CustomizationIDExistsDBPortObj = std::sync::Arc<dyn CustomizationIDExistsDBPort>;
+
+#[cfg(test)]
+pub mod tests {
+    use super::*;
+
+    use std::sync::Arc;
+
+    pub fn mock_customization_id_exists_db_port_false(
+        times: Option<usize>,
+    ) -> CustomizationIDExistsDBPortObj {
+        let mut m = MockCustomizationIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_customization_id_exists()
+                .times(times)
+                .returning(|_| Ok(false));
+        } else {
+            m.expect_customization_id_exists().returning(|_| Ok(false));
+        }
+
+        Arc::new(m)
+    }
+
+    pub fn mock_customization_id_exists_db_port_true(
+        times: Option<usize>,
+    ) -> CustomizationIDExistsDBPortObj {
+        let mut m = MockCustomizationIDExistsDBPort::new();
+        if let Some(times) = times {
+            m.expect_customization_id_exists()
+                .times(times)
+                .returning(|_| Ok(true));
+        } else {
+            m.expect_customization_id_exists().returning(|_| Ok(true));
+        }
+
+        Arc::new(m)
+    }
+}