Bug: refactor(tenant): use tenant id type



Refactor: Use tenant_id type instead of string for better type safety
diff --git a/crates/common_utils/src/id_type.rs b/crates/common_utils/src/id_type.rs
index 3d57a72376e..a8085564145 100644
--- a/crates/common_utils/src/id_type.rs
+++ b/crates/common_utils/src/id_type.rs
@@ -12,6 +12,7 @@ mod payment;
 mod profile;
 mod refunds;
 mod routing;
+mod tenant;
 
 #[cfg(feature = "v2")]
 mod global_id;
@@ -40,6 +41,7 @@ pub use profile::ProfileId;
 pub use refunds::RefundReferenceId;
 pub use routing::RoutingId;
 use serde::{Deserialize, Serialize};
+pub use tenant::TenantId;
 use thiserror::Error;
 
 use crate::{fp_utils::when, generate_id_with_default_len};
diff --git a/crates/common_utils/src/id_type/organization.rs b/crates/common_utils/src/id_type/organization.rs
index a83f35db1d8..2097fbb2450 100644
--- a/crates/common_utils/src/id_type/organization.rs
+++ b/crates/common_utils/src/id_type/organization.rs
@@ -18,7 +18,7 @@ crate::impl_to_sql_from_sql_id_type!(OrganizationId);
 
 impl OrganizationId {
     /// Get an organization id from String
-    pub fn wrap(org_id: String) -> CustomResult<Self, ValidationError> {
+    pub fn try_from_string(org_id: String) -> CustomResult<Self, ValidationError> {
         Self::try_from(std::borrow::Cow::from(org_id))
     }
 }
diff --git a/crates/common_utils/src/id_type/tenant.rs b/crates/common_utils/src/id_type/tenant.rs
new file mode 100644
index 00000000000..953bf82287a
--- /dev/null
+++ b/crates/common_utils/src/id_type/tenant.rs
@@ -0,0 +1,22 @@
+use crate::errors::{CustomResult, ValidationError};
+
+crate::id_type!(
+    TenantId,
+    "A type for tenant_id that can be used for unique identifier for a tenant"
+);
+crate::impl_id_type_methods!(TenantId, "tenant_id");
+
+// This is to display the `TenantId` as TenantId(abcd)
+crate::impl_debug_id_type!(TenantId);
+crate::impl_try_from_cow_str_id_type!(TenantId, "tenant_id");
+
+crate::impl_serializable_secret_id_type!(TenantId);
+crate::impl_queryable_id_type!(TenantId);
+crate::impl_to_sql_from_sql_id_type!(TenantId);
+
+impl TenantId {
+    /// Get tenant id from String
+    pub fn try_from_string(tenant_id: String) -> CustomResult<Self, ValidationError> {
+        Self::try_from(std::borrow::Cow::from(tenant_id))
+    }
+}
diff --git a/crates/common_utils/src/types/theme.rs b/crates/common_utils/src/types/theme.rs
index 03b4cf23a6c..9ad9206acce 100644
--- a/crates/common_utils/src/types/theme.rs
+++ b/crates/common_utils/src/types/theme.rs
@@ -12,15 +12,15 @@ pub enum ThemeLineage {
     // },
     /// Org lineage variant
     Organization {
-        /// tenant_id: String
-        tenant_id: String,
+        /// tenant_id: TenantId
+        tenant_id: id_type::TenantId,
         /// org_id: OrganizationId
         org_id: id_type::OrganizationId,
     },
     /// Merchant lineage variant
     Merchant {
-        /// tenant_id: String
-        tenant_id: String,
+        /// tenant_id: TenantId
+        tenant_id: id_type::TenantId,
         /// org_id: OrganizationId
         org_id: id_type::OrganizationId,
         /// merchant_id: MerchantId
@@ -28,8 +28,8 @@ pub enum ThemeLineage {
     },
     /// Profile lineage variant
     Profile {
-        /// tenant_id: String
-        tenant_id: String,
+        /// tenant_id: TenantId
+        tenant_id: id_type::TenantId,
         /// org_id: OrganizationId
         org_id: id_type::OrganizationId,
         /// merchant_id: MerchantId
diff --git a/crates/diesel_models/src/user/theme.rs b/crates/diesel_models/src/user/theme.rs
index 2f8152e419c..9841e21443c 100644
--- a/crates/diesel_models/src/user/theme.rs
+++ b/crates/diesel_models/src/user/theme.rs
@@ -9,7 +9,7 @@ use crate::schema::themes;
 #[diesel(table_name = themes, primary_key(theme_id), check_for_backend(diesel::pg::Pg))]
 pub struct Theme {
     pub theme_id: String,
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub org_id: Option<id_type::OrganizationId>,
     pub merchant_id: Option<id_type::MerchantId>,
     pub profile_id: Option<id_type::ProfileId>,
@@ -23,7 +23,7 @@ pub struct Theme {
 #[diesel(table_name = themes)]
 pub struct ThemeNew {
     pub theme_id: String,
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub org_id: Option<id_type::OrganizationId>,
     pub merchant_id: Option<id_type::MerchantId>,
     pub profile_id: Option<id_type::ProfileId>,
diff --git a/crates/diesel_models/src/user_role.rs b/crates/diesel_models/src/user_role.rs
index ceddbfd61e4..04f3264b45e 100644
--- a/crates/diesel_models/src/user_role.rs
+++ b/crates/diesel_models/src/user_role.rs
@@ -24,7 +24,7 @@ pub struct UserRole {
     pub entity_id: Option<String>,
     pub entity_type: Option<EntityType>,
     pub version: enums::UserRoleVersion,
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
 }
 
 impl UserRole {
@@ -88,7 +88,7 @@ pub struct UserRoleNew {
     pub entity_id: Option<String>,
     pub entity_type: Option<EntityType>,
     pub version: enums::UserRoleVersion,
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
 }
 
 #[derive(Clone, Debug, AsChangeset, router_derive::DebugAsDisplay)]
diff --git a/crates/drainer/src/handler.rs b/crates/drainer/src/handler.rs
index d8a8bff5afc..d0c26195453 100644
--- a/crates/drainer/src/handler.rs
+++ b/crates/drainer/src/handler.rs
@@ -3,6 +3,7 @@ use std::{
     sync::{atomic, Arc},
 };
 
+use common_utils::id_type;
 use router_env::tracing::Instrument;
 use tokio::{
     sync::{mpsc, oneshot},
@@ -34,12 +35,15 @@ pub struct HandlerInner {
     loop_interval: Duration,
     active_tasks: Arc<atomic::AtomicU64>,
     conf: DrainerSettings,
-    stores: HashMap<String, Arc<Store>>,
+    stores: HashMap<id_type::TenantId, Arc<Store>>,
     running: Arc<atomic::AtomicBool>,
 }
 
 impl Handler {
-    pub fn from_conf(conf: DrainerSettings, stores: HashMap<String, Arc<Store>>) -> Self {
+    pub fn from_conf(
+        conf: DrainerSettings,
+        stores: HashMap<id_type::TenantId, Arc<Store>>,
+    ) -> Self {
         let shutdown_interval = Duration::from_millis(conf.shutdown_interval.into());
         let loop_interval = Duration::from_millis(conf.loop_interval.into());
 
diff --git a/crates/drainer/src/health_check.rs b/crates/drainer/src/health_check.rs
index 48d5f311905..2ca2c1cc79c 100644
--- a/crates/drainer/src/health_check.rs
+++ b/crates/drainer/src/health_check.rs
@@ -2,7 +2,7 @@ use std::{collections::HashMap, sync::Arc};
 
 use actix_web::{web, Scope};
 use async_bb8_diesel::{AsyncConnection, AsyncRunQueryDsl};
-use common_utils::errors::CustomResult;
+use common_utils::{errors::CustomResult, id_type};
 use diesel_models::{Config, ConfigNew};
 use error_stack::ResultExt;
 use router_env::{instrument, logger, tracing};
@@ -20,7 +20,7 @@ pub const TEST_STREAM_DATA: &[(&str, &str)] = &[("data", "sample_data")];
 pub struct Health;
 
 impl Health {
-    pub fn server(conf: Settings, stores: HashMap<String, Arc<Store>>) -> Scope {
+    pub fn server(conf: Settings, stores: HashMap<id_type::TenantId, Arc<Store>>) -> Scope {
         web::scope("health")
             .app_data(web::Data::new(conf))
             .app_data(web::Data::new(stores))
diff --git a/crates/drainer/src/lib.rs b/crates/drainer/src/lib.rs
index 5b67640663c..6eb8c505e15 100644
--- a/crates/drainer/src/lib.rs
+++ b/crates/drainer/src/lib.rs
@@ -14,7 +14,7 @@ use std::{collections::HashMap, sync::Arc};
 mod secrets_transformers;
 
 use actix_web::dev::Server;
-use common_utils::signals::get_allowed_signals;
+use common_utils::{id_type, signals::get_allowed_signals};
 use diesel_models::kv;
 use error_stack::ResultExt;
 use hyperswitch_interfaces::secrets_interface::secret_state::RawSecret;
@@ -31,7 +31,7 @@ use crate::{
 };
 
 pub async fn start_drainer(
-    stores: HashMap<String, Arc<Store>>,
+    stores: HashMap<id_type::TenantId, Arc<Store>>,
     conf: DrainerSettings,
 ) -> errors::DrainerResult<()> {
     let drainer_handler = handler::Handler::from_conf(conf, stores);
@@ -62,7 +62,7 @@ pub async fn start_drainer(
 
 pub async fn start_web_server(
     conf: Settings,
-    stores: HashMap<String, Arc<Store>>,
+    stores: HashMap<id_type::TenantId, Arc<Store>>,
 ) -> Result<Server, errors::DrainerError> {
     let server = conf.server.clone();
     let web_server = actix_web::HttpServer::new(move || {
diff --git a/crates/drainer/src/settings.rs b/crates/drainer/src/settings.rs
index 5b391b492e0..9b6c88b3466 100644
--- a/crates/drainer/src/settings.rs
+++ b/crates/drainer/src/settings.rs
@@ -1,6 +1,6 @@
 use std::{collections::HashMap, path::PathBuf, sync::Arc};
 
-use common_utils::{ext_traits::ConfigExt, DbConnectionParams};
+use common_utils::{ext_traits::ConfigExt, id_type, DbConnectionParams};
 use config::{Environment, File};
 use external_services::managers::{
     encryption_management::EncryptionManagementConfig, secrets_management::SecretsManagementConfig,
@@ -122,23 +122,23 @@ pub struct Multitenancy {
     pub tenants: TenantConfig,
 }
 impl Multitenancy {
-    pub fn get_tenants(&self) -> &HashMap<String, Tenant> {
+    pub fn get_tenants(&self) -> &HashMap<id_type::TenantId, Tenant> {
         &self.tenants.0
     }
-    pub fn get_tenant_ids(&self) -> Vec<String> {
+    pub fn get_tenant_ids(&self) -> Vec<id_type::TenantId> {
         self.tenants
             .0
             .values()
             .map(|tenant| tenant.tenant_id.clone())
             .collect()
     }
-    pub fn get_tenant(&self, tenant_id: &str) -> Option<&Tenant> {
+    pub fn get_tenant(&self, tenant_id: &id_type::TenantId) -> Option<&Tenant> {
         self.tenants.0.get(tenant_id)
     }
 }
 
 #[derive(Debug, Clone, Default)]
-pub struct TenantConfig(pub HashMap<String, Tenant>);
+pub struct TenantConfig(pub HashMap<id_type::TenantId, Tenant>);
 
 impl<'de> Deserialize<'de> for TenantConfig {
     fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
@@ -150,7 +150,7 @@ impl<'de> Deserialize<'de> for TenantConfig {
             clickhouse_database: String,
         }
 
-        let hashmap = <HashMap<String, Inner>>::deserialize(deserializer)?;
+        let hashmap = <HashMap<id_type::TenantId, Inner>>::deserialize(deserializer)?;
 
         Ok(Self(
             hashmap
@@ -172,9 +172,9 @@ impl<'de> Deserialize<'de> for TenantConfig {
     }
 }
 
-#[derive(Debug, Deserialize, Clone, Default)]
+#[derive(Debug, Deserialize, Clone)]
 pub struct Tenant {
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub base_url: String,
     pub schema: String,
     pub redis_key_prefix: String,
diff --git a/crates/router/src/configs/settings.rs b/crates/router/src/configs/settings.rs
index 76b58f5b67b..7b212ec6d1d 100644
--- a/crates/router/src/configs/settings.rs
+++ b/crates/router/src/configs/settings.rs
@@ -6,7 +6,7 @@ use std::{
 #[cfg(feature = "olap")]
 use analytics::{opensearch::OpenSearchConfig, ReportConfig};
 use api_models::{enums, payment_methods::RequiredFieldInfo};
-use common_utils::ext_traits::ConfigExt;
+use common_utils::{ext_traits::ConfigExt, id_type};
 use config::{Environment, File};
 use error_stack::ResultExt;
 #[cfg(feature = "email")]
@@ -138,17 +138,17 @@ pub struct Multitenancy {
 }
 
 impl Multitenancy {
-    pub fn get_tenants(&self) -> &HashMap<String, Tenant> {
+    pub fn get_tenants(&self) -> &HashMap<id_type::TenantId, Tenant> {
         &self.tenants.0
     }
-    pub fn get_tenant_ids(&self) -> Vec<String> {
+    pub fn get_tenant_ids(&self) -> Vec<id_type::TenantId> {
         self.tenants
             .0
             .values()
             .map(|tenant| tenant.tenant_id.clone())
             .collect()
     }
-    pub fn get_tenant(&self, tenant_id: &str) -> Option<&Tenant> {
+    pub fn get_tenant(&self, tenant_id: &id_type::TenantId) -> Option<&Tenant> {
         self.tenants.0.get(tenant_id)
     }
 }
@@ -159,11 +159,11 @@ pub struct DecisionConfig {
 }
 
 #[derive(Debug, Clone, Default)]
-pub struct TenantConfig(pub HashMap<String, Tenant>);
+pub struct TenantConfig(pub HashMap<id_type::TenantId, Tenant>);
 
-#[derive(Debug, Clone, Default)]
+#[derive(Debug, Clone)]
 pub struct Tenant {
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub base_url: String,
     pub schema: String,
     pub redis_key_prefix: String,
@@ -743,8 +743,7 @@ pub struct LockerBasedRecipientConnectorList {
 
 #[derive(Debug, Deserialize, Clone, Default)]
 pub struct ConnectorRequestReferenceIdConfig {
-    pub merchant_ids_send_payment_id_as_connector_request_id:
-        HashSet<common_utils::id_type::MerchantId>,
+    pub merchant_ids_send_payment_id_as_connector_request_id: HashSet<id_type::MerchantId>,
 }
 
 #[derive(Debug, Deserialize, Clone, Default)]
@@ -970,7 +969,7 @@ pub struct ServerTls {
 #[cfg(feature = "v2")]
 #[derive(Debug, Clone, Deserialize, PartialEq, Eq)]
 pub struct CellInformation {
-    pub id: common_utils::id_type::CellId,
+    pub id: id_type::CellId,
 }
 
 #[cfg(feature = "v2")]
@@ -981,8 +980,8 @@ impl Default for CellInformation {
         // around the time of deserializing application settings.
         // And a panic at application startup is considered acceptable.
         #[allow(clippy::expect_used)]
-        let cell_id = common_utils::id_type::CellId::from_string("defid")
-            .expect("Failed to create a default for Cell Id");
+        let cell_id =
+            id_type::CellId::from_string("defid").expect("Failed to create a default for Cell Id");
         Self { id: cell_id }
     }
 }
@@ -1120,7 +1119,7 @@ impl<'de> Deserialize<'de> for TenantConfig {
             clickhouse_database: String,
         }
 
-        let hashmap = <HashMap<String, Inner>>::deserialize(deserializer)?;
+        let hashmap = <HashMap<id_type::TenantId, Inner>>::deserialize(deserializer)?;
 
         Ok(Self(
             hashmap
diff --git a/crates/router/src/core/payment_methods/transformers.rs b/crates/router/src/core/payment_methods/transformers.rs
index c0f54a30f3f..c3fbfd8afbf 100644
--- a/crates/router/src/core/payment_methods/transformers.rs
+++ b/crates/router/src/core/payment_methods/transformers.rs
@@ -389,7 +389,7 @@ pub async fn mk_add_locker_request_hs(
     locker: &settings::Locker,
     payload: &StoreLockerReq,
     locker_choice: api_enums::LockerChoice,
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     request_id: Option<RequestId>,
 ) -> CustomResult<services::Request, errors::VaultError> {
     let payload = payload
@@ -409,7 +409,10 @@ pub async fn mk_add_locker_request_hs(
     url.push_str("/cards/add");
     let mut request = services::Request::new(services::Method::Post, &url);
     request.add_header(headers::CONTENT_TYPE, "application/json".into());
-    request.add_header(headers::X_TENANT_ID, tenant_id.into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        tenant_id.get_string_repr().to_owned().into(),
+    );
     if let Some(req_id) = request_id {
         request.add_header(
             headers::X_REQUEST_ID,
@@ -584,7 +587,7 @@ pub async fn mk_get_card_request_hs(
     merchant_id: &id_type::MerchantId,
     card_reference: &str,
     locker_choice: Option<api_enums::LockerChoice>,
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     request_id: Option<RequestId>,
 ) -> CustomResult<services::Request, errors::VaultError> {
     let merchant_customer_id = customer_id.to_owned();
@@ -612,7 +615,10 @@ pub async fn mk_get_card_request_hs(
     url.push_str("/cards/retrieve");
     let mut request = services::Request::new(services::Method::Post, &url);
     request.add_header(headers::CONTENT_TYPE, "application/json".into());
-    request.add_header(headers::X_TENANT_ID, tenant_id.into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        tenant_id.get_string_repr().to_owned().into(),
+    );
     if let Some(req_id) = request_id {
         request.add_header(
             headers::X_REQUEST_ID,
@@ -665,7 +671,7 @@ pub async fn mk_delete_card_request_hs(
     customer_id: &id_type::CustomerId,
     merchant_id: &id_type::MerchantId,
     card_reference: &str,
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     request_id: Option<RequestId>,
 ) -> CustomResult<services::Request, errors::VaultError> {
     let merchant_customer_id = customer_id.to_owned();
@@ -691,7 +697,10 @@ pub async fn mk_delete_card_request_hs(
     url.push_str("/cards/delete");
     let mut request = services::Request::new(services::Method::Post, &url);
     request.add_header(headers::CONTENT_TYPE, "application/json".into());
-    request.add_header(headers::X_TENANT_ID, tenant_id.into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        tenant_id.get_string_repr().to_owned().into(),
+    );
     if let Some(req_id) = request_id {
         request.add_header(
             headers::X_REQUEST_ID,
@@ -711,7 +720,7 @@ pub async fn mk_delete_card_request_hs_by_id(
     id: &String,
     merchant_id: &id_type::MerchantId,
     card_reference: &str,
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     request_id: Option<RequestId>,
 ) -> CustomResult<services::Request, errors::VaultError> {
     let merchant_customer_id = id.to_owned();
@@ -737,7 +746,10 @@ pub async fn mk_delete_card_request_hs_by_id(
     url.push_str("/cards/delete");
     let mut request = services::Request::new(services::Method::Post, &url);
     request.add_header(headers::CONTENT_TYPE, "application/json".into());
-    request.add_header(headers::X_TENANT_ID, tenant_id.into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        tenant_id.get_string_repr().to_owned().into(),
+    );
     if let Some(req_id) = request_id {
         request.add_header(
             headers::X_REQUEST_ID,
@@ -832,7 +844,7 @@ pub fn mk_crud_locker_request(
     locker: &settings::Locker,
     path: &str,
     req: api::TokenizePayloadEncrypted,
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     request_id: Option<RequestId>,
 ) -> CustomResult<services::Request, errors::VaultError> {
     let mut url = locker.basilisk_host.to_owned();
@@ -840,7 +852,10 @@ pub fn mk_crud_locker_request(
     let mut request = services::Request::new(services::Method::Post, &url);
     request.add_default_headers();
     request.add_header(headers::CONTENT_TYPE, "application/json".into());
-    request.add_header(headers::X_TENANT_ID, tenant_id.into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        tenant_id.get_string_repr().to_owned().into(),
+    );
     if let Some(req_id) = request_id {
         request.add_header(
             headers::X_REQUEST_ID,
diff --git a/crates/router/src/core/routing/helpers.rs b/crates/router/src/core/routing/helpers.rs
index aef89ea8ed9..264328796c8 100644
--- a/crates/router/src/core/routing/helpers.rs
+++ b/crates/router/src/core/routing/helpers.rs
@@ -751,7 +751,10 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
             &metrics::CONTEXT,
             1,
             &add_attributes([
-                ("tenant", state.tenant.tenant_id.clone()),
+                (
+                    "tenant",
+                    state.tenant.tenant_id.get_string_repr().to_owned(),
+                ),
                 (
                     "merchant_profile_id",
                     format!(
diff --git a/crates/router/src/core/user.rs b/crates/router/src/core/user.rs
index bff6205f5db..78f5682fd7f 100644
--- a/crates/router/src/core/user.rs
+++ b/crates/router/src/core/user.rs
@@ -1105,11 +1105,15 @@ pub async fn create_internal_user(
             }
         })?;
 
-    let default_tenant_id = common_utils::consts::DEFAULT_TENANT.to_string();
+    let default_tenant_id = common_utils::id_type::TenantId::try_from_string(
+        common_utils::consts::DEFAULT_TENANT.to_owned(),
+    )
+    .change_context(UserErrors::InternalServerError)
+    .attach_printable("Unable to parse default tenant id")?;
 
     if state.tenant.tenant_id != default_tenant_id {
         return Err(UserErrors::ForbiddenTenantId)
-            .attach_printable("Operation allowed only for the default tenant.");
+            .attach_printable("Operation allowed only for the default tenant");
     }
 
     let internal_merchant_id = common_utils::id_type::MerchantId::get_internal_user_merchant_id(
diff --git a/crates/router/src/db/events.rs b/crates/router/src/db/events.rs
index 651c2ece610..6bb7de1b7d9 100644
--- a/crates/router/src/db/events.rs
+++ b/crates/router/src/db/events.rs
@@ -732,7 +732,10 @@ mod tests {
         ))
         .await;
         let state = &Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let merchant_id =
             common_utils::id_type::MerchantId::try_from(std::borrow::Cow::from("merchant_1"))
diff --git a/crates/router/src/db/merchant_connector_account.rs b/crates/router/src/db/merchant_connector_account.rs
index be2c25d4767..687f6e8fea2 100644
--- a/crates/router/src/db/merchant_connector_account.rs
+++ b/crates/router/src/db/merchant_connector_account.rs
@@ -1502,8 +1502,12 @@ mod merchant_connector_account_cache_tests {
             Box::new(services::MockApiClient),
         ))
         .await;
+
         let state = &Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         #[allow(clippy::expect_used)]
         let db = MockDb::new(&redis_interface::RedisSettings::default())
@@ -1685,7 +1689,10 @@ mod merchant_connector_account_cache_tests {
         ))
         .await;
         let state = &Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         #[allow(clippy::expect_used)]
         let db = MockDb::new(&redis_interface::RedisSettings::default())
diff --git a/crates/router/src/db/merchant_key_store.rs b/crates/router/src/db/merchant_key_store.rs
index 65a5515a391..9f12ec8e8fd 100644
--- a/crates/router/src/db/merchant_key_store.rs
+++ b/crates/router/src/db/merchant_key_store.rs
@@ -348,7 +348,10 @@ mod tests {
         ))
         .await;
         let state = &Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         #[allow(clippy::expect_used)]
         let mock_db = MockDb::new(&redis_interface::RedisSettings::default())
diff --git a/crates/router/src/routes/app.rs b/crates/router/src/routes/app.rs
index baa2ba4ae15..1584cfae2b9 100644
--- a/crates/router/src/routes/app.rs
+++ b/crates/router/src/routes/app.rs
@@ -7,6 +7,7 @@ use api_models::routing::RoutingRetrieveQuery;
 use common_enums::TransactionType;
 #[cfg(feature = "partial-auth")]
 use common_utils::crypto::Blake3;
+use common_utils::id_type;
 #[cfg(feature = "email")]
 use external_services::email::{
     no_email::NoEmailClient, ses::AwsSes, smtp::SmtpServer, EmailClientConfigs, EmailService,
@@ -193,14 +194,14 @@ impl SessionStateInfo for SessionState {
 pub struct AppState {
     pub flow_name: String,
     pub global_store: Box<dyn GlobalStorageInterface>,
-    pub stores: HashMap<String, Box<dyn StorageInterface>>,
+    pub stores: HashMap<id_type::TenantId, Box<dyn StorageInterface>>,
     pub conf: Arc<settings::Settings<RawSecret>>,
     pub event_handler: EventsHandler,
     #[cfg(feature = "email")]
     pub email_client: Arc<Box<dyn EmailService>>,
     pub api_client: Box<dyn crate::services::ApiClient>,
     #[cfg(feature = "olap")]
-    pub pools: HashMap<String, AnalyticsProvider>,
+    pub pools: HashMap<id_type::TenantId, AnalyticsProvider>,
     #[cfg(feature = "olap")]
     pub opensearch_client: Arc<OpenSearchClient>,
     pub request_id: Option<RequestId>,
@@ -209,7 +210,7 @@ pub struct AppState {
     pub grpc_client: Arc<GrpcClients>,
 }
 impl scheduler::SchedulerAppState for AppState {
-    fn get_tenants(&self) -> Vec<String> {
+    fn get_tenants(&self) -> Vec<id_type::TenantId> {
         self.conf.multitenancy.get_tenant_ids()
     }
 }
@@ -328,7 +329,7 @@ impl AppState {
             );
 
             #[cfg(feature = "olap")]
-            let mut pools: HashMap<String, AnalyticsProvider> = HashMap::new();
+            let mut pools: HashMap<id_type::TenantId, AnalyticsProvider> = HashMap::new();
             let mut stores = HashMap::new();
             #[allow(clippy::expect_used)]
             let cache_store = get_cache_store(&conf.clone(), shut_down_signal, testable)
@@ -443,7 +444,11 @@ impl AppState {
         .await
     }
 
-    pub fn get_session_state<E, F>(self: Arc<Self>, tenant: &str, err: F) -> Result<SessionState, E>
+    pub fn get_session_state<E, F>(
+        self: Arc<Self>,
+        tenant: &id_type::TenantId,
+        err: F,
+    ) -> Result<SessionState, E>
     where
         F: FnOnce() -> E + Copy,
     {
diff --git a/crates/router/src/services/api.rs b/crates/router/src/services/api.rs
index bdd650389a7..9416ff175a8 100644
--- a/crates/router/src/services/api.rs
+++ b/crates/router/src/services/api.rs
@@ -68,7 +68,7 @@ use crate::{
         api_logs::{ApiEvent, ApiEventMetric, ApiEventsType},
         connector_api_logs::ConnectorEvent,
     },
-    logger,
+    headers, logger,
     routes::{
         app::{AppStateInfo, ReqState, SessionStateInfo},
         metrics, AppState, SessionState,
@@ -722,33 +722,44 @@ where
 
     let mut event_type = payload.get_api_event_type();
     let tenant_id = if !state.conf.multitenancy.enabled {
-        DEFAULT_TENANT.to_string()
+        common_utils::id_type::TenantId::try_from_string(DEFAULT_TENANT.to_owned())
+            .attach_printable("Unable to get default tenant id")
+            .change_context(errors::ApiErrorResponse::InternalServerError.switch())?
     } else {
         let request_tenant_id = incoming_request_header
             .get(TENANT_HEADER)
             .and_then(|value| value.to_str().ok())
-            .ok_or_else(|| errors::ApiErrorResponse::MissingTenantId.switch())?;
+            .ok_or_else(|| errors::ApiErrorResponse::MissingTenantId.switch())
+            .and_then(|header_value| {
+                common_utils::id_type::TenantId::try_from_string(header_value.to_string()).map_err(
+                    |_| {
+                        errors::ApiErrorResponse::InvalidRequestData {
+                            message: format!("`{}` header is invalid", headers::X_TENANT_ID),
+                        }
+                        .switch()
+                    },
+                )
+            })?;
 
         state
             .conf
             .multitenancy
-            .get_tenant(request_tenant_id)
+            .get_tenant(&request_tenant_id)
             .map(|tenant| tenant.tenant_id.clone())
             .ok_or(
                 errors::ApiErrorResponse::InvalidTenant {
-                    tenant_id: request_tenant_id.to_string(),
+                    tenant_id: request_tenant_id.get_string_repr().to_string(),
                 }
                 .switch(),
             )?
     };
 
-    let mut session_state =
-        Arc::new(app_state.clone()).get_session_state(tenant_id.as_str(), || {
-            errors::ApiErrorResponse::InvalidTenant {
-                tenant_id: tenant_id.clone(),
-            }
-            .switch()
-        })?;
+    let mut session_state = Arc::new(app_state.clone()).get_session_state(&tenant_id, || {
+        errors::ApiErrorResponse::InvalidTenant {
+            tenant_id: tenant_id.get_string_repr().to_string(),
+        }
+        .switch()
+    })?;
     session_state.add_request_id(request_id);
     let mut request_state = session_state.get_req_state();
 
@@ -757,9 +768,10 @@ where
         .event_context
         .record_info(("flow".to_string(), flow.to_string()));
 
-    request_state
-        .event_context
-        .record_info(("tenant_id".to_string(), tenant_id.to_string()));
+    request_state.event_context.record_info((
+        "tenant_id".to_string(),
+        tenant_id.get_string_repr().to_string(),
+    ));
 
     // Currently auth failures are not recorded as API events
     let (auth_out, auth_type) = api_auth
diff --git a/crates/router/src/services/authentication.rs b/crates/router/src/services/authentication.rs
index 2541a5dc7d4..2f5f55b8434 100644
--- a/crates/router/src/services/authentication.rs
+++ b/crates/router/src/services/authentication.rs
@@ -185,7 +185,7 @@ pub struct UserFromSinglePurposeToken {
     pub user_id: String,
     pub origin: domain::Origin,
     pub path: Vec<TokenPurpose>,
-    pub tenant_id: Option<String>,
+    pub tenant_id: Option<id_type::TenantId>,
 }
 
 #[cfg(feature = "olap")]
@@ -196,7 +196,7 @@ pub struct SinglePurposeToken {
     pub origin: domain::Origin,
     pub path: Vec<TokenPurpose>,
     pub exp: u64,
-    pub tenant_id: Option<String>,
+    pub tenant_id: Option<id_type::TenantId>,
 }
 
 #[cfg(feature = "olap")]
@@ -207,7 +207,7 @@ impl SinglePurposeToken {
         origin: domain::Origin,
         settings: &Settings,
         path: Vec<TokenPurpose>,
-        tenant_id: Option<String>,
+        tenant_id: Option<id_type::TenantId>,
     ) -> UserResult<String> {
         let exp_duration =
             std::time::Duration::from_secs(consts::SINGLE_PURPOSE_TOKEN_TIME_IN_SECS);
@@ -232,7 +232,7 @@ pub struct AuthToken {
     pub exp: u64,
     pub org_id: id_type::OrganizationId,
     pub profile_id: id_type::ProfileId,
-    pub tenant_id: Option<String>,
+    pub tenant_id: Option<id_type::TenantId>,
 }
 
 #[cfg(feature = "olap")]
@@ -244,7 +244,7 @@ impl AuthToken {
         settings: &Settings,
         org_id: id_type::OrganizationId,
         profile_id: id_type::ProfileId,
-        tenant_id: Option<String>,
+        tenant_id: Option<id_type::TenantId>,
     ) -> UserResult<String> {
         let exp_duration = std::time::Duration::from_secs(consts::JWT_TOKEN_TIME_IN_SECS);
         let exp = jwt::generate_exp(exp_duration)?.as_secs();
@@ -268,7 +268,7 @@ pub struct UserFromToken {
     pub role_id: String,
     pub org_id: id_type::OrganizationId,
     pub profile_id: id_type::ProfileId,
-    pub tenant_id: Option<String>,
+    pub tenant_id: Option<id_type::TenantId>,
 }
 
 pub struct UserIdFromAuth {
@@ -282,7 +282,7 @@ pub struct SinglePurposeOrLoginToken {
     pub role_id: Option<String>,
     pub purpose: Option<TokenPurpose>,
     pub exp: u64,
-    pub tenant_id: Option<String>,
+    pub tenant_id: Option<id_type::TenantId>,
 }
 
 pub trait AuthInfo {
@@ -1110,7 +1110,7 @@ impl<'a> HeaderMapStruct<'a> {
         self.get_mandatory_header_value_by_key(headers::X_ORGANIZATION_ID)
             .map(|val| val.to_owned())
             .and_then(|organization_id| {
-                id_type::OrganizationId::wrap(organization_id).change_context(
+                id_type::OrganizationId::try_from_string(organization_id).change_context(
                     errors::ApiErrorResponse::InvalidRequestData {
                         message: format!("`{}` header is invalid", headers::X_ORGANIZATION_ID),
                     },
diff --git a/crates/router/src/services/authorization.rs b/crates/router/src/services/authorization.rs
index 35a0b159ab2..87ff9f6abd5 100644
--- a/crates/router/src/services/authorization.rs
+++ b/crates/router/src/services/authorization.rs
@@ -112,12 +112,16 @@ pub fn check_permission(
         )
 }
 
-pub fn check_tenant(token_tenant_id: Option<String>, header_tenant_id: &str) -> RouterResult<()> {
+pub fn check_tenant(
+    token_tenant_id: Option<id_type::TenantId>,
+    header_tenant_id: &id_type::TenantId,
+) -> RouterResult<()> {
     if let Some(tenant_id) = token_tenant_id {
-        if tenant_id != header_tenant_id {
+        if tenant_id != *header_tenant_id {
             return Err(ApiErrorResponse::InvalidJwtToken).attach_printable(format!(
                 "Token tenant ID: '{}' does not match Header tenant ID: '{}'",
-                tenant_id, header_tenant_id
+                tenant_id.get_string_repr().to_owned(),
+                header_tenant_id.get_string_repr().to_owned()
             ));
         }
     }
diff --git a/crates/router/src/types/domain/user.rs b/crates/router/src/types/domain/user.rs
index 4cb69e68ed8..6d0d2a4ea07 100644
--- a/crates/router/src/types/domain/user.rs
+++ b/crates/router/src/types/domain/user.rs
@@ -1106,20 +1106,20 @@ pub struct NoLevel;
 
 #[derive(Clone)]
 pub struct OrganizationLevel {
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub org_id: id_type::OrganizationId,
 }
 
 #[derive(Clone)]
 pub struct MerchantLevel {
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub org_id: id_type::OrganizationId,
     pub merchant_id: id_type::MerchantId,
 }
 
 #[derive(Clone)]
 pub struct ProfileLevel {
-    pub tenant_id: String,
+    pub tenant_id: id_type::TenantId,
     pub org_id: id_type::OrganizationId,
     pub merchant_id: id_type::MerchantId,
     pub profile_id: id_type::ProfileId,
@@ -1156,7 +1156,7 @@ impl NewUserRole<NoLevel> {
 }
 
 pub struct EntityInfo {
-    tenant_id: String,
+    tenant_id: id_type::TenantId,
     org_id: id_type::OrganizationId,
     merchant_id: Option<id_type::MerchantId>,
     profile_id: Option<id_type::ProfileId>,
diff --git a/crates/router/src/utils/user.rs b/crates/router/src/utils/user.rs
index 8a9daefb287..f115a16c062 100644
--- a/crates/router/src/utils/user.rs
+++ b/crates/router/src/utils/user.rs
@@ -92,7 +92,7 @@ pub async fn generate_jwt_auth_token_with_attributes(
     org_id: id_type::OrganizationId,
     role_id: String,
     profile_id: id_type::ProfileId,
-    tenant_id: Option<String>,
+    tenant_id: Option<id_type::TenantId>,
 ) -> UserResult<Secret<String>> {
     let token = AuthToken::new_token(
         user_id,
diff --git a/crates/router/tests/cache.rs b/crates/router/tests/cache.rs
index 8c3f34cd1e1..55b92b4aace 100644
--- a/crates/router/tests/cache.rs
+++ b/crates/router/tests/cache.rs
@@ -18,7 +18,10 @@ async fn invalidate_existing_cache_success() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     let cache_key = "cacheKey".to_string();
     let cache_key_value = "val".to_string();
diff --git a/crates/router/tests/connectors/aci.rs b/crates/router/tests/connectors/aci.rs
index 6f4855d1e22..9dfd331b72a 100644
--- a/crates/router/tests/connectors/aci.rs
+++ b/crates/router/tests/connectors/aci.rs
@@ -216,7 +216,10 @@ async fn payments_create_success() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
 
     use router::connector::Aci;
@@ -263,7 +266,10 @@ async fn payments_create_failure() {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let connector = utils::construct_connector_data_old(
             Box::new(Aci::new()),
@@ -326,7 +332,10 @@ async fn refund_for_successful_payments() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     let connector_integration: services::BoxedPaymentConnectorIntegrationInterface<
         types::api::Authorize,
@@ -396,7 +405,10 @@ async fn refunds_create_failure() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     let connector_integration: services::BoxedRefundConnectorIntegrationInterface<
         types::api::Execute,
diff --git a/crates/router/tests/connectors/utils.rs b/crates/router/tests/connectors/utils.rs
index 52218b211ac..383b4db358c 100644
--- a/crates/router/tests/connectors/utils.rs
+++ b/crates/router/tests/connectors/utils.rs
@@ -599,7 +599,10 @@ pub trait ConnectorActions: Connector {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let res = services::api::execute_connector_processing_step(
             &state,
@@ -639,7 +642,10 @@ pub trait ConnectorActions: Connector {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let res = services::api::execute_connector_processing_step(
             &state,
@@ -680,7 +686,10 @@ pub trait ConnectorActions: Connector {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let res = services::api::execute_connector_processing_step(
             &state,
@@ -720,7 +729,10 @@ pub trait ConnectorActions: Connector {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let res = services::api::execute_connector_processing_step(
             &state,
@@ -811,7 +823,10 @@ pub trait ConnectorActions: Connector {
         ))
         .await;
         let state = Arc::new(app_state)
-            .get_session_state("public", || {})
+            .get_session_state(
+                &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+                || {},
+            )
             .unwrap();
         let res = services::api::execute_connector_processing_step(
             &state,
@@ -848,7 +863,10 @@ async fn call_connector<
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     services::api::execute_connector_processing_step(
         &state,
diff --git a/crates/router/tests/payments.rs b/crates/router/tests/payments.rs
index df4340a353e..68ca08c8bd3 100644
--- a/crates/router/tests/payments.rs
+++ b/crates/router/tests/payments.rs
@@ -295,7 +295,10 @@ async fn payments_create_core() {
     let merchant_id = id_type::MerchantId::try_from(Cow::from("juspay_merchant")).unwrap();
 
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     let key_manager_state = &(&state).into();
     let key_store = state
@@ -552,7 +555,10 @@ async fn payments_create_core_adyen_no_redirect() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
 
     let payment_id =
diff --git a/crates/router/tests/payments2.rs b/crates/router/tests/payments2.rs
index b5962d454fa..90fe3a1f847 100644
--- a/crates/router/tests/payments2.rs
+++ b/crates/router/tests/payments2.rs
@@ -56,7 +56,10 @@ async fn payments_create_core() {
     let merchant_id = id_type::MerchantId::try_from(Cow::from("juspay_merchant")).unwrap();
 
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
     let key_manager_state = &(&state).into();
     let key_store = state
@@ -321,7 +324,10 @@ async fn payments_create_core_adyen_no_redirect() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
 
     let customer_id = format!("cust_{}", Uuid::new_v4());
diff --git a/crates/router/tests/services.rs b/crates/router/tests/services.rs
index d907000cccd..c014370b24f 100644
--- a/crates/router/tests/services.rs
+++ b/crates/router/tests/services.rs
@@ -18,7 +18,10 @@ async fn get_redis_conn_failure() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
 
     let _ = state.store.get_redis_conn().map(|conn| {
@@ -46,7 +49,10 @@ async fn get_redis_conn_success() {
     ))
     .await;
     let state = Arc::new(app_state)
-        .get_session_state("public", || {})
+        .get_session_state(
+            &common_utils::id_type::TenantId::try_from_string("public".to_string()).unwrap(),
+            || {},
+        )
         .unwrap();
 
     // Act
diff --git a/crates/scheduler/src/consumer.rs b/crates/scheduler/src/consumer.rs
index 5791edd31b0..846f1137b12 100644
--- a/crates/scheduler/src/consumer.rs
+++ b/crates/scheduler/src/consumer.rs
@@ -7,7 +7,7 @@ use std::{
 pub mod types;
 pub mod workflows;
 
-use common_utils::{errors::CustomResult, signals::get_allowed_signals};
+use common_utils::{errors::CustomResult, id_type, signals::get_allowed_signals};
 use diesel_models::enums;
 pub use diesel_models::{self, process_tracker as storage};
 use error_stack::ResultExt;
@@ -42,7 +42,7 @@ pub async fn start_consumer<T: SchedulerAppState + 'static, U: SchedulerSessionS
     app_state_to_session_state: F,
 ) -> CustomResult<(), errors::ProcessTrackerError>
 where
-    F: Fn(&T, &str) -> CustomResult<U, errors::ProcessTrackerError>,
+    F: Fn(&T, &id_type::TenantId) -> CustomResult<U, errors::ProcessTrackerError>,
 {
     use std::time::Duration;
 
@@ -88,7 +88,7 @@ where
                 let start_time = std_time::Instant::now();
                 let tenants = state.get_tenants();
                 for tenant in tenants {
-                    let session_state = app_state_to_session_state(state, tenant.as_str())?;
+                    let session_state = app_state_to_session_state(state, &tenant)?;
                     pt_utils::consumer_operation_handler(
                         session_state.clone(),
                         settings.clone(),
diff --git a/crates/scheduler/src/producer.rs b/crates/scheduler/src/producer.rs
index 6f710f55a34..b91434fcbb0 100644
--- a/crates/scheduler/src/producer.rs
+++ b/crates/scheduler/src/producer.rs
@@ -1,6 +1,6 @@
 use std::sync::Arc;
 
-use common_utils::errors::CustomResult;
+use common_utils::{errors::CustomResult, id_type};
 use diesel_models::enums::ProcessTrackerStatus;
 use error_stack::{report, ResultExt};
 use router_env::{
@@ -27,7 +27,7 @@ pub async fn start_producer<T, U, F>(
     app_state_to_session_state: F,
 ) -> CustomResult<(), errors::ProcessTrackerError>
 where
-    F: Fn(&T, &str) -> CustomResult<U, errors::ProcessTrackerError>,
+    F: Fn(&T, &id_type::TenantId) -> CustomResult<U, errors::ProcessTrackerError>,
     T: SchedulerAppState,
     U: SchedulerSessionState,
 {
@@ -69,7 +69,7 @@ where
                 interval.tick().await;
                 let tenants = state.get_tenants();
                 for tenant in tenants {
-                    let session_state = app_state_to_session_state(state, tenant.as_str())?;
+                    let session_state = app_state_to_session_state(state, &tenant)?;
                     match run_producer_flow(&session_state, &scheduler_settings).await {
                         Ok(_) => (),
                         Err(error) => {
diff --git a/crates/scheduler/src/scheduler.rs b/crates/scheduler/src/scheduler.rs
index 39a45d02ba9..2685c6311ea 100644
--- a/crates/scheduler/src/scheduler.rs
+++ b/crates/scheduler/src/scheduler.rs
@@ -1,6 +1,6 @@
 use std::sync::Arc;
 
-use common_utils::errors::CustomResult;
+use common_utils::{errors::CustomResult, id_type};
 use storage_impl::mock_db::MockDb;
 #[cfg(feature = "kv_store")]
 use storage_impl::KVRouterStore;
@@ -52,7 +52,7 @@ impl SchedulerInterface for MockDb {}
 
 #[async_trait::async_trait]
 pub trait SchedulerAppState: Send + Sync + Clone {
-    fn get_tenants(&self) -> Vec<String>;
+    fn get_tenants(&self) -> Vec<id_type::TenantId>;
 }
 #[async_trait::async_trait]
 pub trait SchedulerSessionState: Send + Sync + Clone {
@@ -71,7 +71,7 @@ pub async fn start_process_tracker<
     app_state_to_session_state: F,
 ) -> CustomResult<(), errors::ProcessTrackerError>
 where
-    F: Fn(&T, &str) -> CustomResult<U, errors::ProcessTrackerError>,
+    F: Fn(&T, &id_type::TenantId) -> CustomResult<U, errors::ProcessTrackerError>,
 {
     match scheduler_flow {
         SchedulerFlow::Producer => {

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
Use tenant_id type for better type safety


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
Closes [#6642](https://github.com/juspay/hyperswitch/issues/6642)


## How did you test it?
It refactoring PR, its compiling and checks are passing
Tested flows like signup/signin with tenancy featue flag enabled and disabled in local


## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
