diff --git a/raystack/frontier/v1beta1/frontier.proto b/raystack/frontier/v1beta1/frontier.proto
index eab89d9b..e61ec44c 100644
--- a/raystack/frontier/v1beta1/frontier.proto
+++ b/raystack/frontier/v1beta1/frontier.proto
@@ -1362,6 +1362,264 @@ service FrontierService {
       description: "List a user preferences by ID.";
     };
   }
+
+  // Billing customer
+  rpc CreateBillingCustomer(CreateBillingCustomerRequest) returns (CreateBillingCustomerResponse) {
+    option (google.api.http) = {
+      post: "/v1beta1/billing/customers",
+      body: "*"
+    };
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Billing";
+      summary: "Create billing customer";
+      description: "Create a new billing customer for an organization.";
+    };
+  }
+
+  rpc GetBillingCustomer(GetBillingCustomerRequest) returns (GetBillingCustomerResponse) {
+    option (google.api.http) = {get: "/v1beta1/billing/customers/{id}"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Billing";
+      summary: "Get billing customer";
+      description: "Get a billing customer by ID.";
+    };
+  }
+
+  rpc UpdateBillingCustomer(UpdateBillingCustomerRequest) returns (UpdateBillingCustomerResponse) {
+    option (google.api.http) = {
+      put: "/v1beta1/billing/customers/{id}",
+      body: "*"
+    };
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Billing";
+      summary: "Update billing customer";
+      description: "Update a billing customer by ID.";
+    };
+  }
+
+  rpc ListBillingCustomers(ListBillingCustomersRequest) returns (ListBillingCustomersResponse) {
+    option (google.api.http) = {get: "/v1beta1/billing/customers"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Billing";
+      summary: "List billing customers";
+      description: "List billing customers of an organization.";
+    };
+  }
+
+  rpc DeleteBillingCustomer(DeleteBillingCustomerRequest) returns (DeleteBillingCustomerResponse) {
+    option (google.api.http) = {delete: "/v1beta1/billing/customers/{id}"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Billing";
+      summary: "Delete billing customer";
+      description: "Delete a billing customer by ID.";
+    };
+  }
+
+  // Subscriptions
+  rpc CreateSubscription(CreateSubscriptionRequest) returns (CreateSubscriptionResponse) {
+    option (google.api.http) = {
+      post: "/v1beta1/billing/customers/{customer_id}/subscriptions",
+      body: "*"
+    };
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Subscription";
+      summary: "Create subscription";
+      description: "Create a new subscription for a billing customer.";
+    };
+  }
+
+  rpc GetSubscription(GetSubscriptionRequest) returns (GetSubscriptionResponse) {
+    option (google.api.http) = {get: "/v1beta1/billing/customers/{customer_id}/subscriptions/{id}"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Subscription";
+      summary: "Get subscription";
+      description: "Get a subscription by ID.";
+    };
+  }
+
+  rpc ListSubscriptions(ListSubscriptionsRequest) returns (ListSubscriptionsResponse) {
+    option (google.api.http) = {get: "/v1beta1/billing/customers/{customer_id}/subscriptions"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Subscription";
+      summary: "List subscriptions";
+      description: "List subscriptions of a billing customer.";
+    };
+  }
+
+  rpc UpdateSubscription(UpdateSubscriptionRequest) returns (UpdateSubscriptionResponse) {
+    option (google.api.http) = {
+      put: "/v1beta1/billing/customers/{customer_id}/subscriptions/{id}",
+      body: "*"
+    };
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Subscription";
+      summary: "Update subscription";
+      description: "Update a subscription by ID.";
+    };
+  }
+
+  // Plans
+  rpc ListPlans(ListPlansRequest) returns (ListPlansResponse) {
+    option (google.api.http) = {get: "/v1beta1/billing/plans"};
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Plan";
+      summary: "List plans";
+      description: "List all plans.";
+    };
+  }
+
+  // Billing Entitlements
+  rpc CheckFeatureEntitlement(CheckFeatureEntitlementRequest) returns (CheckFeatureEntitlementResponse) {
+    option (google.api.http) = {
+      post: "/v1beta1/billing/check",
+      body: "*"
+    };
+    option (grpc.gateway.protoc_gen_openapiv2.options.openapiv2_operation) = {
+      tags: "Entitlement";
+      summary: "Check entitlement";
+      description: "Check if a billing customer is entitled to a feature.";
+    };
+  }
+}
+
+// Billing
+
+message BillingCustomerRequestBody {
+  string name = 1;
+  string email = 2;
+  string phone = 3;
+  BillingCustomer.Address address = 4;
+  string currency = 5;
+
+  google.protobuf.Struct metadata = 10;
+}
+
+message CreateBillingCustomerRequest {
+  // ID of the organization to create the billing customer for
+  string org_id = 1 [(validate.rules).string.min_len = 1];
+  // Billing customer to create.
+  BillingCustomerRequestBody body = 2;
+}
+
+message CreateBillingCustomerResponse {
+  // Created billing customer
+  BillingCustomer billing_customer = 1;
+}
+
+message GetBillingCustomerRequest {
+  // ID of the billing customer to get
+  string id = 1 [(validate.rules).string.min_len = 1];
+
+  string org_id = 2 [(validate.rules).string.min_len = 1];
+}
+
+message GetBillingCustomerResponse {
+  // Billing customer
+  BillingCustomer billing_customer = 1;
+}
+
+message UpdateBillingCustomerRequest {
+  // ID of the billing customer to update
+  string id = 1 [(validate.rules).string.min_len = 1];
+
+  string org_id = 2 [(validate.rules).string.min_len = 1];
+
+  // Billing customer to update.
+  BillingCustomerRequestBody body = 3;
+}
+
+message UpdateBillingCustomerResponse {
+  // Updated billing customer
+  BillingCustomer billing_customer = 1;
+}
+
+message ListBillingCustomersRequest {
+  // ID of the organization to list billing customers for
+  string org_id = 1 [(validate.rules).string.min_len = 1];
+}
+
+message ListBillingCustomersResponse {
+  // List of billing customers
+  repeated BillingCustomer billing_customers = 1;
+}
+
+message DeleteBillingCustomerRequest {
+  // ID of the billing customer to delete
+  string id = 1 [(validate.rules).string.min_len = 1];
+
+  string org_id = 2 [(validate.rules).string.min_len = 1];
+}
+
+message DeleteBillingCustomerResponse {}
+
+message SubscriptionRequestBody {
+  string plan = 1;
+  string success_url = 2;
+  string cancel_url = 3;
+  int32 trail_days = 4;
+}
+
+message CreateSubscriptionRequest {
+  // ID of the billing customer to create the subscription for
+  string customer_id = 1 [(validate.rules).string.min_len = 1];
+  // Subscription to create
+  SubscriptionRequestBody body = 2;
+}
+
+message CreateSubscriptionResponse {
+  // Created subscription
+  Subscription subscription = 1;
+}
+
+message GetSubscriptionRequest {
+  // ID of the billing customer to get the subscription for
+  string customer_id = 1 [(validate.rules).string.min_len = 1];
+  // ID of the subscription to get
+  string id = 2 [(validate.rules).string.min_len = 1];
+}
+
+message GetSubscriptionResponse {
+  Subscription subscription = 1;
+}
+
+message ListSubscriptionsRequest {
+  // ID of the billing customer to list subscriptions for
+  string customer_id = 1 [(validate.rules).string.min_len = 1];
+}
+
+message ListSubscriptionsResponse {
+  // List of subscriptions
+  repeated Subscription subscriptions = 1;
+}
+
+message UpdateSubscriptionRequest {
+  // ID of the billing customer to update the subscription for
+  string customer_id = 1 [(validate.rules).string.min_len = 1];
+  // ID of the subscription to update
+  string id = 2 [(validate.rules).string.min_len = 1];
+  // Subscription to update
+  SubscriptionRequestBody body = 3;
+}
+
+message UpdateSubscriptionResponse {
+  // Updated subscription
+  Subscription subscription = 1;
+}
+
+message ListPlansRequest {}
+
+message ListPlansResponse {
+  // List of plans
+  repeated Plan plans = 1;
+}
+
+message CheckFeatureEntitlementRequest {
+  string customer_id = 1 [(validate.rules).string.min_len = 1];
+  string feature = 2 [(validate.rules).string.min_len = 1];
+}
+
+message CheckFeatureEntitlementResponse {
+  bool status = 1;
 }
 
 // Authentication
diff --git a/raystack/frontier/v1beta1/models.proto b/raystack/frontier/v1beta1/models.proto
index 12e8d262..3a8e03e4 100644
--- a/raystack/frontier/v1beta1/models.proto
+++ b/raystack/frontier/v1beta1/models.proto
@@ -531,6 +531,97 @@ message Preference {
   }];
 }
 
+message BillingCustomer {
+  message Address {
+    string line1 = 1;
+    string line2 = 2;
+    string city = 3;
+    string state = 4;
+    string postal_code = 5;
+    string country = 6;
+  }
+
+  string id = 1;
+  string org_id = 2;
+  
+  string name = 3;
+  string email = 4;
+  string phone = 5;
+  Address address = 6;
+  string provider_id = 7;
+  string provider = 8;
+  string currency = 9;
+  string state = 10;
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+  google.protobuf.Timestamp updated_at = 22;
+}
+
+message Subscription {
+  string id = 1;
+  string customer_id = 2;
+  string provider_id = 3;
+  string plan_id = 4;
+
+  string state = 5;
+  string success_url = 6;
+  string cancel_url = 7;
+  string checkout_url = 8;
+  int32 trial_days = 9;
+
+  google.protobuf.Struct metadata = 10;
+  google.protobuf.Timestamp created_at = 11;
+  google.protobuf.Timestamp updated_at = 12;
+  google.protobuf.Timestamp canceled_at = 13;
+}
+
+message Plan {
+  string id = 1;
+  string name = 2;
+  string title = 3;
+  string description = 4;
+  repeated Feature features = 5;
+  string interval = 6; // known intervals are "day", "week", "month", and "year"
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+  google.protobuf.Timestamp updated_at = 22;
+}
+
+message Feature {
+  string id = 1;
+  string name = 2;
+  string title = 3;
+  string description = 4;
+  string plan_id = 5;
+  string state = 6;
+
+  Price price = 7;
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+  google.protobuf.Timestamp updated_at = 22;
+}
+
+message Price {
+  string id = 1;
+  string feature_id = 2;
+  string provider_id = 3;
+  string name = 4;
+  string usage_type = 7; // known types are "licensed" and "metered"
+  string billing_scheme = 8; // known schemes are "tiered" and "flat"
+  string state = 9;
+  string currency = 10; // like "usd", "eur", "gbp"
+  int64 amount = 11;
+  string metered_aggregate = 13; // known aggregations are "sum", "last_during_period" and "max"
+  string tier_mode = 14; // known modes are "graduated" and "volume"
+
+  google.protobuf.Struct metadata = 20;
+  google.protobuf.Timestamp created_at = 21;
+  google.protobuf.Timestamp updated_at = 22;
+}
+
 // Model crud body
 
 message RoleRequestBody {