diff --git a/libs/shared-entity/src/dto/billing_dto.rs b/libs/shared-entity/src/dto/billing_dto.rs
index 8d25cc50..fb71f465 100644
--- a/libs/shared-entity/src/dto/billing_dto.rs
+++ b/libs/shared-entity/src/dto/billing_dto.rs
@@ -3,8 +3,8 @@ use serde::{Deserialize, Serialize};
 #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
 #[serde(rename_all = "snake_case")]
 pub enum RecurringInterval {
-  Month,
-  Year,
+  Month = 0,
+  Year = 1,
 }
 
 impl RecurringInterval {
@@ -28,6 +28,15 @@ impl TryFrom<i16> for RecurringInterval {
   }
 }
 
+impl Into<i16> for RecurringInterval {
+  fn into(self) -> i16 {
+    match self {
+      RecurringInterval::Month => 0,
+      RecurringInterval::Year => 1,
+    }
+  }
+}
+
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "snake_case")]
 #[repr(i16)]
@@ -55,6 +64,18 @@ impl TryFrom<i16> for SubscriptionPlan {
   }
 }
 
+impl Into<i16> for SubscriptionPlan {
+  fn into(self) -> i16 {
+    match self {
+      SubscriptionPlan::Free => 0,
+      SubscriptionPlan::Pro => 1,
+      SubscriptionPlan::Team => 2,
+      SubscriptionPlan::AiMax => 3,
+      SubscriptionPlan::AiLocal => 4,
+    }
+  }
+}
+
 impl AsRef<str> for SubscriptionPlan {
   fn as_ref(&self) -> &str {
     match self {