diff --git a/crates/api_models/src/admin.rs b/crates/api_models/src/admin.rs
index 398888e140..084d8bf93d 100644
--- a/crates/api_models/src/admin.rs
+++ b/crates/api_models/src/admin.rs
@@ -24,6 +24,7 @@ pub struct CreateMerchantAccount {
     pub redirect_to_merchant_with_http_post: Option<bool>,
     pub metadata: Option<serde_json::Value>,
     pub publishable_key: Option<String>,
+    pub locker_id: Option<String>,
 }
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
diff --git a/crates/router/src/core/admin.rs b/crates/router/src/core/admin.rs
index 26b2f0a2f1..fdbb9b90d3 100644
--- a/crates/router/src/core/admin.rs
+++ b/crates/router/src/core/admin.rs
@@ -70,6 +70,7 @@ pub async fn create_merchant_account(
         payment_response_hash_key: req.payment_response_hash_key,
         redirect_to_merchant_with_http_post: req.redirect_to_merchant_with_http_post,
         publishable_key: Some(publishable_key.to_owned()),
+        locker_id: req.locker_id,
     };
 
     db.insert_merchant(merchant_account)
@@ -125,6 +126,7 @@ pub async fn get_merchant_account(
         ),
         metadata: None,
         publishable_key: merchant_account.publishable_key,
+        locker_id: merchant_account.locker_id,
     };
     Ok(service_api::BachResponse::Json(response))
 }
@@ -214,6 +216,9 @@ pub async fn merchant_account_update(
         publishable_key: req
             .publishable_key
             .or_else(|| merchant_account.publishable_key.clone()),
+        locker_id: req
+            .locker_id
+            .or_else(|| merchant_account.locker_id.to_owned()),
     };
     response.merchant_id = merchant_id.to_string();
     response.api_key = merchant_account.api_key.to_owned();
diff --git a/crates/router/src/core/mandate.rs b/crates/router/src/core/mandate.rs
index e1f5a4878a..501b99fb07 100644
--- a/crates/router/src/core/mandate.rs
+++ b/crates/router/src/core/mandate.rs
@@ -31,7 +31,7 @@ pub async fn get_mandate(
         .await
         .map_err(|error| error.to_not_found_response(errors::ApiErrorResponse::MandateNotFound))?;
     Ok(services::BachResponse::Json(
-        mandates::MandateResponse::from_db_mandate(state, mandate).await?,
+        mandates::MandateResponse::from_db_mandate(state, mandate, &merchant_account).await?,
     ))
 }
 
@@ -77,7 +77,10 @@ pub async fn get_customer_mandates(
     } else {
         let mut response_vec = Vec::with_capacity(mandates.len());
         for mandate in mandates {
-            response_vec.push(mandates::MandateResponse::from_db_mandate(state, mandate).await?);
+            response_vec.push(
+                mandates::MandateResponse::from_db_mandate(state, mandate, &merchant_account)
+                    .await?,
+            );
         }
         Ok(services::BachResponse::Json(response_vec))
     }
@@ -87,6 +90,7 @@ pub async fn mandate_procedure<F, FData>(
     state: &AppState,
     mut resp: types::RouterData<F, FData, types::PaymentsResponseData>,
     maybe_customer: &Option<storage::Customer>,
+    merchant_account: &storage::MerchantAccount,
 ) -> errors::RouterResult<types::RouterData<F, FData, types::PaymentsResponseData>>
 where
     FData: MandateBehaviour,
@@ -132,7 +136,7 @@ where
             if resp.request.get_setup_mandate_details().is_some() {
                 let payment_method_id = helpers::call_payment_method(
                     state,
-                    &resp.merchant_id,
+                    merchant_account,
                     Some(&resp.request.get_payment_method_data()),
                     Some(resp.payment_method),
                     maybe_customer,
diff --git a/crates/router/src/core/payment_methods/cards.rs b/crates/router/src/core/payment_methods/cards.rs
index 414d507675..873d64c771 100644
--- a/crates/router/src/core/payment_methods/cards.rs
+++ b/crates/router/src/core/payment_methods/cards.rs
@@ -50,13 +50,13 @@ pub async fn create_payment_method(
 pub async fn add_payment_method(
     state: &routes::AppState,
     req: api::CreatePaymentMethod,
-    merchant_id: String,
+    merchant_account: &storage::MerchantAccount,
 ) -> errors::RouterResponse<api::PaymentMethodResponse> {
     req.validate()?;
-
+    let merchant_id = &merchant_account.merchant_id;
     let customer_id = req.customer_id.clone().get_required_value("customer_id")?;
     match req.card.clone() {
-        Some(card) => add_card(state, req, card, customer_id, &merchant_id)
+        Some(card) => add_card(state, req, card, customer_id, merchant_account)
             .await
             .change_context(errors::ApiErrorResponse::InternalServerError)
             .attach_printable("Add Card Failed"),
@@ -67,14 +67,14 @@ pub async fn add_payment_method(
                 &req,
                 &customer_id,
                 &payment_method_id,
-                &merchant_id,
+                merchant_id,
             )
             .await
             .map_err(|error| {
                 error.to_duplicate_response(errors::ApiErrorResponse::DuplicatePaymentMethod)
             })?;
             Ok(api::PaymentMethodResponse {
-                merchant_id,
+                merchant_id: merchant_id.to_string(),
                 customer_id: Some(customer_id),
                 payment_method_id: payment_method_id.to_string(),
                 payment_method: req.payment_method,
@@ -124,7 +124,7 @@ pub async fn update_customer_payment_method(
         metadata: req.metadata,
         customer_id: Some(pm.customer_id),
     };
-    add_payment_method(state, new_pm, merchant_account.merchant_id).await
+    add_payment_method(state, new_pm, &merchant_account).await
 }
 
 #[instrument(skip_all)]
@@ -133,11 +133,25 @@ pub async fn add_card(
     req: api::CreatePaymentMethod,
     card: api::CardDetail,
     customer_id: String,
-    merchant_id: &str,
+    merchant_account: &storage::MerchantAccount,
 ) -> errors::CustomResult<api::PaymentMethodResponse, errors::CardVaultError> {
     let locker = &state.conf.locker;
     let db = &*state.store;
-    let request = payment_methods::mk_add_card_request(locker, &card, &customer_id, &req)?;
+    let merchant_id = &merchant_account.merchant_id;
+    let locker_id = merchant_account
+        .locker_id
+        .to_owned()
+        .get_required_value("locker_id")
+        .change_context(errors::CardVaultError::SaveCardFailed)?;
+
+    let request = payment_methods::mk_add_card_request(
+        locker,
+        &card,
+        &customer_id,
+        &req,
+        &locker_id,
+        merchant_id,
+    )?;
     let response = if !locker.mock_locker {
         let response = services::call_connector_api(state, request)
             .await
@@ -278,11 +292,11 @@ pub async fn mock_delete_card<'a>(
 #[instrument(skip_all)]
 pub async fn get_card_from_legacy_locker<'a>(
     state: &'a routes::AppState,
-    merchant_id: &'a str,
+    locker_id: &'a str,
     card_id: &'a str,
 ) -> errors::RouterResult<payment_methods::GetCardResponse> {
     let locker = &state.conf.locker;
-    let request = payment_methods::mk_get_card_request(locker, merchant_id, card_id)
+    let request = payment_methods::mk_get_card_request(locker, locker_id, card_id)
         .change_context(errors::ApiErrorResponse::InternalServerError)
         .attach_printable("Making get card request failed")?;
     let get_card_result = if !locker.mock_locker {
@@ -519,7 +533,11 @@ pub async fn list_customer_payment_method(
     for pm in resp.into_iter() {
         let payment_token = generate_id(consts::ID_LENGTH, "token");
         let card = if pm.payment_method == enums::PaymentMethodType::Card {
-            Some(get_lookup_key_from_locker(state, &payment_token, &pm).await?)
+            let locker_id = merchant_account
+                .locker_id
+                .to_owned()
+                .get_required_value("locker_id")?;
+            Some(get_lookup_key_from_locker(state, &payment_token, &pm, &locker_id).await?)
         } else {
             None
         };
@@ -557,13 +575,10 @@ pub async fn get_lookup_key_from_locker(
     state: &routes::AppState,
     payment_token: &str,
     pm: &storage::PaymentMethod,
+    locker_id: &str,
 ) -> errors::RouterResult<api::CardDetailFromLocker> {
-    let get_card_resp = get_card_from_legacy_locker(
-        state,
-        pm.merchant_id.as_str(),
-        pm.payment_method_id.as_str(),
-    )
-    .await?;
+    let get_card_resp =
+        get_card_from_legacy_locker(state, locker_id, pm.payment_method_id.as_str()).await?;
     let card_detail = payment_methods::get_card_detail(pm, get_card_resp.card)
         .change_context(errors::ApiErrorResponse::InternalServerError)
         .attach_printable("Get Card Details Failed")?;
@@ -717,6 +732,7 @@ pub async fn get_card_info_from_value(
 pub async fn retrieve_payment_method(
     state: &routes::AppState,
     pm: api::PaymentMethodId,
+    merchant_account: storage::MerchantAccount,
 ) -> errors::RouterResponse<api::PaymentMethodResponse> {
     let db = &*state.store;
     let pm = db
@@ -726,8 +742,9 @@ pub async fn retrieve_payment_method(
             error.to_not_found_response(errors::ApiErrorResponse::PaymentMethodNotFound)
         })?;
     let card = if pm.payment_method == enums::PaymentMethodType::Card {
+        let locker_id = merchant_account.locker_id.get_required_value("locker_id")?;
         let get_card_resp =
-            get_card_from_legacy_locker(state, &pm.merchant_id, &pm.payment_method_id).await?;
+            get_card_from_legacy_locker(state, &locker_id, &pm.payment_method_id).await?;
         let card_detail = payment_methods::get_card_detail(&pm, get_card_resp.card)
             .change_context(errors::ApiErrorResponse::InternalServerError)?;
         Some(card_detail)
diff --git a/crates/router/src/core/payment_methods/transformers.rs b/crates/router/src/core/payment_methods/transformers.rs
index 40f5caea93..46377c3c1e 100644
--- a/crates/router/src/core/payment_methods/transformers.rs
+++ b/crates/router/src/core/payment_methods/transformers.rs
@@ -68,16 +68,20 @@ pub fn mk_add_card_request(
     card: &api::CardDetail,
     customer_id: &str,
     _req: &api::CreatePaymentMethod,
+    locker_id: &str,
+    _merchant_id: &str,
 ) -> CustomResult<services::Request, errors::CardVaultError> {
+    #[cfg(feature = "sandbox")]
+    let customer_id = format!("{}::{}", customer_id, _merchant_id);
     let add_card_req = AddCardRequest {
         card_number: card.card_number.clone(),
-        customer_id,
+        customer_id: &customer_id,
         card_exp_month: card.card_exp_month.clone(),
         card_exp_year: card.card_exp_year.clone(),
-        merchant_id: "m0010", // [#253]: Need mapping for application mid to lockeId
+        merchant_id: locker_id,
         email_address: Some("dummy@gmail.com".to_string().into()), //
-        name_on_card: Some("juspay".to_string().into()), // [#256]
-        nickname: Some("router".to_string()), //
+        name_on_card: Some("juspay".to_string().into()),           // [#256]
+        nickname: Some("router".to_string()),                      //
     };
     let body = utils::Encode::<AddCardRequest<'_>>::encode(&add_card_req)
         .change_context(errors::CardVaultError::RequestEncodingFailed)?;
@@ -128,11 +132,11 @@ pub fn mk_add_card_response(
 
 pub fn mk_get_card_request<'a>(
     locker: &Locker,
-    _mid: &'a str,
+    locker_id: &'a str,
     card_id: &'a str,
 ) -> CustomResult<services::Request, errors::CardVaultError> {
     let get_card_req = GetCard {
-        merchant_id: "m0010", // [#253]: need to assign locker id to every merchant
+        merchant_id: locker_id,
         card_id,
     };
 
diff --git a/crates/router/src/core/payments.rs b/crates/router/src/core/payments.rs
index bd6bd7b467..5c36a499c9 100644
--- a/crates/router/src/core/payments.rs
+++ b/crates/router/src/core/payments.rs
@@ -74,10 +74,9 @@ where
         .get_trackers(
             state,
             &validate_result.payment_id,
-            validate_result.merchant_id,
             &req,
             validate_result.mandate_type,
-            validate_result.storage_scheme,
+            &merchant_account,
         )
         .await?;
 
@@ -323,7 +322,7 @@ where
             &connector,
             customer,
             call_connector_action,
-            merchant_account.storage_scheme,
+            merchant_account,
         )
         .await;
 
@@ -387,7 +386,7 @@ where
             connector,
             customer,
             CallConnectorAction::Trigger,
-            merchant_account.storage_scheme,
+            merchant_account,
         );
 
         join_handlers.push(res);
diff --git a/crates/router/src/core/payments/flows.rs b/crates/router/src/core/payments/flows.rs
index 63e29ecf8c..d685daa34a 100644
--- a/crates/router/src/core/payments/flows.rs
+++ b/crates/router/src/core/payments/flows.rs
@@ -11,10 +11,7 @@ use crate::{
     core::{errors::RouterResult, payments},
     routes::AppState,
     services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -35,7 +32,7 @@ pub trait Feature<F, T> {
         connector: &api::ConnectorData,
         maybe_customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self>
     where
         Self: Sized,
diff --git a/crates/router/src/core/payments/flows/authorize_flow.rs b/crates/router/src/core/payments/flows/authorize_flow.rs
index e36007772d..dc7fe558aa 100644
--- a/crates/router/src/core/payments/flows/authorize_flow.rs
+++ b/crates/router/src/core/payments/flows/authorize_flow.rs
@@ -10,10 +10,7 @@ use crate::{
     routes::AppState,
     scheduler::metrics,
     services,
-    types::{
-        self, api,
-        storage::{self, enums as storage_enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -54,7 +51,7 @@ impl Feature<api::Authorize, types::PaymentsAuthorizeData> for types::PaymentsAu
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        storage_scheme: storage_enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         let resp = self
             .decide_flow(
@@ -63,7 +60,7 @@ impl Feature<api::Authorize, types::PaymentsAuthorizeData> for types::PaymentsAu
                 customer,
                 Some(true),
                 call_connector_action,
-                storage_scheme,
+                merchant_account,
             )
             .await;
 
@@ -81,7 +78,7 @@ impl types::PaymentsAuthorizeRouterData {
         maybe_customer: &Option<storage::Customer>,
         confirm: Option<bool>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_scheme: storage_enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         match confirm {
             Some(true) => {
@@ -100,7 +97,10 @@ impl types::PaymentsAuthorizeRouterData {
                 .await
                 .map_err(|error| error.to_payment_failed_response())?;
 
-                Ok(mandate::mandate_procedure(state, resp, maybe_customer).await?)
+                Ok(
+                    mandate::mandate_procedure(state, resp, maybe_customer, merchant_account)
+                        .await?,
+                )
             }
             _ => Ok(self.clone()),
         }
diff --git a/crates/router/src/core/payments/flows/cancel_flow.rs b/crates/router/src/core/payments/flows/cancel_flow.rs
index e54f5a970b..2dfb74505c 100644
--- a/crates/router/src/core/payments/flows/cancel_flow.rs
+++ b/crates/router/src/core/payments/flows/cancel_flow.rs
@@ -8,10 +8,7 @@ use crate::{
     },
     routes::AppState,
     services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -44,7 +41,7 @@ impl Feature<api::Void, types::PaymentsCancelData>
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_scheme: enums::MerchantStorageScheme,
+        _merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         self.decide_flow(
             state,
diff --git a/crates/router/src/core/payments/flows/capture_flow.rs b/crates/router/src/core/payments/flows/capture_flow.rs
index 1fc736bccc..7b84d8f502 100644
--- a/crates/router/src/core/payments/flows/capture_flow.rs
+++ b/crates/router/src/core/payments/flows/capture_flow.rs
@@ -8,10 +8,7 @@ use crate::{
     },
     routes::AppState,
     services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -45,7 +42,7 @@ impl Feature<api::Capture, types::PaymentsCaptureData>
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_scheme: enums::MerchantStorageScheme,
+        _merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         self.decide_flow(
             state,
diff --git a/crates/router/src/core/payments/flows/psync_flow.rs b/crates/router/src/core/payments/flows/psync_flow.rs
index 1e471b593b..fafc0d6d03 100644
--- a/crates/router/src/core/payments/flows/psync_flow.rs
+++ b/crates/router/src/core/payments/flows/psync_flow.rs
@@ -8,10 +8,7 @@ use crate::{
     },
     routes::AppState,
     services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -46,7 +43,7 @@ impl Feature<api::PSync, types::PaymentsSyncData>
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_scheme: enums::MerchantStorageScheme,
+        _merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         self.decide_flow(
             state,
diff --git a/crates/router/src/core/payments/flows/session_flow.rs b/crates/router/src/core/payments/flows/session_flow.rs
index e76eb518a3..c0cdaffefc 100644
--- a/crates/router/src/core/payments/flows/session_flow.rs
+++ b/crates/router/src/core/payments/flows/session_flow.rs
@@ -9,10 +9,7 @@ use crate::{
         payments::{self, transformers, PaymentData},
     },
     routes, services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
     utils::OptionExt,
 };
 
@@ -45,7 +42,7 @@ impl Feature<api::Session, types::PaymentsSessionData> for types::PaymentsSessio
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_schema: enums::MerchantStorageScheme,
+        _merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         self.decide_flow(
             state,
diff --git a/crates/router/src/core/payments/flows/verfiy_flow.rs b/crates/router/src/core/payments/flows/verfiy_flow.rs
index ef019350d4..284f2cd464 100644
--- a/crates/router/src/core/payments/flows/verfiy_flow.rs
+++ b/crates/router/src/core/payments/flows/verfiy_flow.rs
@@ -9,10 +9,7 @@ use crate::{
     },
     routes::AppState,
     services,
-    types::{
-        self, api,
-        storage::{self, enums},
-    },
+    types::{self, api, storage},
 };
 
 #[async_trait]
@@ -43,7 +40,7 @@ impl Feature<api::Verify, types::VerifyRequestData> for types::VerifyRouterData
         connector: &api::ConnectorData,
         customer: &Option<storage::Customer>,
         call_connector_action: payments::CallConnectorAction,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         self.decide_flow(
             state,
@@ -51,7 +48,7 @@ impl Feature<api::Verify, types::VerifyRequestData> for types::VerifyRouterData
             customer,
             Some(true),
             call_connector_action,
-            storage_scheme,
+            merchant_account,
         )
         .await
     }
@@ -65,7 +62,7 @@ impl types::VerifyRouterData {
         maybe_customer: &Option<storage::Customer>,
         confirm: Option<bool>,
         call_connector_action: payments::CallConnectorAction,
-        _storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<Self> {
         match confirm {
             Some(true) => {
@@ -83,7 +80,10 @@ impl types::VerifyRouterData {
                 )
                 .await
                 .map_err(|err| err.to_verify_failed_response())?;
-                Ok(mandate::mandate_procedure(state, resp, maybe_customer).await?)
+                Ok(
+                    mandate::mandate_procedure(state, resp, maybe_customer, merchant_account)
+                        .await?,
+                )
             }
             _ => Ok(self.clone()),
         }
diff --git a/crates/router/src/core/payments/helpers.rs b/crates/router/src/core/payments/helpers.rs
index 85e817434b..fec8d8a51f 100644
--- a/crates/router/src/core/payments/helpers.rs
+++ b/crates/router/src/core/payments/helpers.rs
@@ -101,7 +101,7 @@ pub async fn get_token_pm_type_mandate_details(
     state: &AppState,
     request: &api::PaymentsRequest,
     mandate_type: Option<api::MandateTxnType>,
-    merchant_id: &str,
+    merchant_account: &storage::MerchantAccount,
 ) -> RouterResult<(
     Option<String>,
     Option<storage_enums::PaymentMethodType>,
@@ -121,7 +121,7 @@ pub async fn get_token_pm_type_mandate_details(
         }
         Some(api::MandateTxnType::RecurringMandateTxn) => {
             let (token_, payment_method_type_) =
-                get_token_for_recurring_mandate(state, request, merchant_id).await?;
+                get_token_for_recurring_mandate(state, request, merchant_account).await?;
             Ok((token_, payment_method_type_, None))
         }
         None => Ok((
@@ -135,13 +135,13 @@ pub async fn get_token_pm_type_mandate_details(
 pub async fn get_token_for_recurring_mandate(
     state: &AppState,
     req: &api::PaymentsRequest,
-    merchant_id: &str,
+    merchant_account: &storage::MerchantAccount,
 ) -> RouterResult<(Option<String>, Option<storage_enums::PaymentMethodType>)> {
     let db = &*state.store;
     let mandate_id = req.mandate_id.clone().get_required_value("mandate_id")?;
 
     let mandate = db
-        .find_mandate_by_merchant_id_mandate_id(merchant_id, mandate_id.as_str())
+        .find_mandate_by_merchant_id_mandate_id(&merchant_account.merchant_id, mandate_id.as_str())
         .await
         .map_err(|error| error.to_not_found_response(errors::ApiErrorResponse::MandateNotFound))?;
 
@@ -176,8 +176,11 @@ pub async fn get_token_for_recurring_mandate(
         })?;
 
     let token = Uuid::new_v4().to_string();
-
-    let _ = cards::get_lookup_key_from_locker(state, &token, &payment_method).await?;
+    let locker_id = merchant_account
+        .locker_id
+        .to_owned()
+        .get_required_value("locker_id")?;
+    let _ = cards::get_lookup_key_from_locker(state, &token, &payment_method, &locker_id).await?;
 
     if let Some(payment_method_from_request) = req.payment_method {
         let pm: storage_enums::PaymentMethodType = payment_method_from_request.foreign_into();
@@ -509,7 +512,7 @@ where
 #[instrument(skip_all)]
 pub(crate) async fn call_payment_method(
     state: &AppState,
-    merchant_id: &str,
+    merchant_account: &storage::MerchantAccount,
     payment_method: Option<&api::PaymentMethod>,
     payment_method_type: Option<storage_enums::PaymentMethodType>,
     maybe_customer: &Option<storage::Customer>,
@@ -539,7 +542,7 @@ pub(crate) async fn call_payment_method(
                             let resp = cards::add_payment_method(
                                 state,
                                 payment_method_request,
-                                merchant_id.to_string(),
+                                merchant_account,
                             )
                             .await
                             .attach_printable("Error on adding payment method")?;
@@ -567,13 +570,10 @@ pub(crate) async fn call_payment_method(
                         metadata: None,
                         customer_id: None,
                     };
-                    let resp = cards::add_payment_method(
-                        state,
-                        payment_method_request,
-                        merchant_id.to_string(),
-                    )
-                    .await
-                    .attach_printable("Error on adding payment method")?;
+                    let resp =
+                        cards::add_payment_method(state, payment_method_request, merchant_account)
+                            .await
+                            .attach_printable("Error on adding payment method")?;
                     match resp {
                         crate::services::BachResponse::Json(payment_method) => Ok(payment_method),
                         _ => Err(report!(errors::ApiErrorResponse::InternalServerError)
diff --git a/crates/router/src/core/payments/operations.rs b/crates/router/src/core/payments/operations.rs
index 5d127c205a..33000465ea 100644
--- a/crates/router/src/core/payments/operations.rs
+++ b/crates/router/src/core/payments/operations.rs
@@ -88,10 +88,9 @@ pub trait GetTracker<F, D, R>: Send {
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &R,
         mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(BoxedOperation<'a, F, R>, D, Option<CustomerDetails>)>;
 }
 
diff --git a/crates/router/src/core/payments/operations/payment_cancel.rs b/crates/router/src/core/payments/operations/payment_cancel.rs
index 6377231744..ca13a66298 100644
--- a/crates/router/src/core/payments/operations/payment_cancel.rs
+++ b/crates/router/src/core/payments/operations/payment_cancel.rs
@@ -32,16 +32,17 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsCancelRequest>
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsCancelRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsCancelRequest>,
         PaymentData<F>,
         Option<CustomerDetails>,
     )> {
         let db = &*state.store;
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
         let payment_id = payment_id
             .get_payment_intent_id()
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
diff --git a/crates/router/src/core/payments/operations/payment_capture.rs b/crates/router/src/core/payments/operations/payment_capture.rs
index ef8d6aad42..e0d9b5ef26 100644
--- a/crates/router/src/core/payments/operations/payment_capture.rs
+++ b/crates/router/src/core/payments/operations/payment_capture.rs
@@ -33,16 +33,17 @@ impl<F: Send + Clone> GetTracker<F, payments::PaymentData<F>, api::PaymentsCaptu
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsCaptureRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsCaptureRequest>,
         payments::PaymentData<F>,
         Option<payments::CustomerDetails>,
     )> {
         let db = &*state.store;
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
         let (payment_intent, mut payment_attempt, currency, amount);
 
         let payment_id = payment_id
diff --git a/crates/router/src/core/payments/operations/payment_confirm.rs b/crates/router/src/core/payments/operations/payment_confirm.rs
index af0c1cc330..f58c98e411 100644
--- a/crates/router/src/core/payments/operations/payment_confirm.rs
+++ b/crates/router/src/core/payments/operations/payment_confirm.rs
@@ -34,16 +34,17 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsRequest,
         mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
         Option<CustomerDetails>,
     )> {
         let db = &*state.store;
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
         let (mut payment_intent, mut payment_attempt, currency, amount, connector_response);
 
         let payment_id = payment_id
@@ -51,8 +52,13 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
 
         let (token, payment_method_type, setup_mandate) =
-            helpers::get_token_pm_type_mandate_details(state, request, mandate_type, merchant_id)
-                .await?;
+            helpers::get_token_pm_type_mandate_details(
+                state,
+                request,
+                mandate_type,
+                merchant_account,
+            )
+            .await?;
 
         payment_intent = db
             .find_payment_intent_by_payment_id_merchant_id(&payment_id, merchant_id, storage_scheme)
diff --git a/crates/router/src/core/payments/operations/payment_create.rs b/crates/router/src/core/payments/operations/payment_create.rs
index eb1cf1d533..86ef9aa31b 100644
--- a/crates/router/src/core/payments/operations/payment_create.rs
+++ b/crates/router/src/core/payments/operations/payment_create.rs
@@ -39,10 +39,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsRequest,
         mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
@@ -50,6 +49,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
     )> {
         let db = &*state.store;
 
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
+
         let (payment_intent, payment_attempt, connector_response);
 
         let money @ (amount, currency) = payments_create_request_validation(request)?;
@@ -61,8 +63,13 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
 
         let (token, payment_method_type, setup_mandate) =
-            helpers::get_token_pm_type_mandate_details(state, request, mandate_type, merchant_id)
-                .await?;
+            helpers::get_token_pm_type_mandate_details(
+                state,
+                request,
+                mandate_type,
+                merchant_account,
+            )
+            .await?;
 
         let shipping_address = helpers::get_address_for_payment_request(
             db,
diff --git a/crates/router/src/core/payments/operations/payment_method_validate.rs b/crates/router/src/core/payments/operations/payment_method_validate.rs
index c57b499ff2..cb7c9276b3 100644
--- a/crates/router/src/core/payments/operations/payment_method_validate.rs
+++ b/crates/router/src/core/payments/operations/payment_method_validate.rs
@@ -66,16 +66,19 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::VerifyRequest> for Paym
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::VerifyRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: storage_enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::VerifyRequest>,
         PaymentData<F>,
         Option<payments::CustomerDetails>,
     )> {
         let db = &state.store;
+
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
+
         let (payment_intent, payment_attempt, connector_response);
 
         let payment_id = payment_id
diff --git a/crates/router/src/core/payments/operations/payment_session.rs b/crates/router/src/core/payments/operations/payment_session.rs
index d104eead10..2ce4b16976 100644
--- a/crates/router/src/core/payments/operations/payment_session.rs
+++ b/crates/router/src/core/payments/operations/payment_session.rs
@@ -37,10 +37,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsSessionRequest>
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsSessionRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsSessionRequest>,
         PaymentData<F>,
@@ -51,6 +50,8 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsSessionRequest>
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
 
         let db = &*state.store;
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
 
         let mut payment_attempt = db
             .find_payment_attempt_by_payment_id_merchant_id(
diff --git a/crates/router/src/core/payments/operations/payment_start.rs b/crates/router/src/core/payments/operations/payment_start.rs
index 6ffb441de2..76d710aada 100644
--- a/crates/router/src/core/payments/operations/payment_start.rs
+++ b/crates/router/src/core/payments/operations/payment_start.rs
@@ -34,10 +34,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsStartRequest> f
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         _request: &api::PaymentsStartRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsStartRequest>,
         PaymentData<F>,
@@ -46,6 +45,8 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsStartRequest> f
         let (mut payment_intent, payment_attempt, currency, amount);
         let db = &*state.store;
 
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
         let payment_id = payment_id
             .get_payment_intent_id()
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
diff --git a/crates/router/src/core/payments/operations/payment_status.rs b/crates/router/src/core/payments/operations/payment_status.rs
index 7736ffdf87..aa514323f1 100644
--- a/crates/router/src/core/payments/operations/payment_status.rs
+++ b/crates/router/src/core/payments/operations/payment_status.rs
@@ -152,10 +152,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRetrieveRequest
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsRetrieveRequest,
         _mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRetrieveRequest>,
         PaymentData<F>,
@@ -163,11 +162,11 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRetrieveRequest
     )> {
         get_tracker_for_sync(
             payment_id,
-            merchant_id,
+            &merchant_account.merchant_id,
             &*state.store,
             request,
             self,
-            storage_scheme,
+            merchant_account.storage_scheme,
         )
         .await
     }
diff --git a/crates/router/src/core/payments/operations/payment_update.rs b/crates/router/src/core/payments/operations/payment_update.rs
index 5641f13670..0e1e6646ae 100644
--- a/crates/router/src/core/payments/operations/payment_update.rs
+++ b/crates/router/src/core/payments/operations/payment_update.rs
@@ -33,10 +33,9 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         &'a self,
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
-        merchant_id: &str,
         request: &api::PaymentsRequest,
         mandate_type: Option<api::MandateTxnType>,
-        storage_scheme: enums::MerchantStorageScheme,
+        merchant_account: &storage::MerchantAccount,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
@@ -47,11 +46,18 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         let payment_id = payment_id
             .get_payment_intent_id()
             .change_context(errors::ApiErrorResponse::PaymentNotFound)?;
+        let merchant_id = &merchant_account.merchant_id;
+        let storage_scheme = merchant_account.storage_scheme;
 
         let db = &*state.store;
         let (token, payment_method_type, setup_mandate) =
-            helpers::get_token_pm_type_mandate_details(state, request, mandate_type, merchant_id)
-                .await?;
+            helpers::get_token_pm_type_mandate_details(
+                state,
+                request,
+                mandate_type,
+                merchant_account,
+            )
+            .await?;
 
         payment_attempt = db
             .find_payment_attempt_by_payment_id_merchant_id(
diff --git a/crates/router/src/db/merchant_account.rs b/crates/router/src/db/merchant_account.rs
index d0e48d114e..dfeeb4ea6e 100644
--- a/crates/router/src/db/merchant_account.rs
+++ b/crates/router/src/db/merchant_account.rs
@@ -143,6 +143,7 @@ impl MerchantAccountInterface for MockDb {
             parent_merchant_id: merchant_account.parent_merchant_id,
             publishable_key: merchant_account.publishable_key,
             storage_scheme: enums::MerchantStorageScheme::PostgresOnly,
+            locker_id: merchant_account.locker_id,
         };
         accounts.push(account.clone());
         Ok(account)
diff --git a/crates/router/src/routes/payment_methods.rs b/crates/router/src/routes/payment_methods.rs
index 410f6d69d1..7d98bac58d 100644
--- a/crates/router/src/routes/payment_methods.rs
+++ b/crates/router/src/routes/payment_methods.rs
@@ -21,9 +21,7 @@ pub async fn create_payment_method_api(
         &req,
         json_payload.into_inner(),
         |state, merchant_account, req| async move {
-            let merchant_id = merchant_account.merchant_id.clone();
-
-            cards::add_payment_method(state, req, merchant_id).await
+            cards::add_payment_method(state, req, &merchant_account).await
         },
         api::MerchantAuthentication::ApiKey,
     )
@@ -101,7 +99,7 @@ pub async fn payment_method_retrieve_api(
         &state,
         &req,
         payload,
-        |state, _, pm| cards::retrieve_payment_method(state, pm),
+        |state, merchant_account, pm| cards::retrieve_payment_method(state, pm, merchant_account),
         api::MerchantAuthentication::ApiKey,
     )
     .await
diff --git a/crates/router/src/services/api.rs b/crates/router/src/services/api.rs
index 9d8b3e4a45..d48bce9168 100644
--- a/crates/router/src/services/api.rs
+++ b/crates/router/src/services/api.rs
@@ -562,6 +562,7 @@ pub async fn authenticate_merchant<'a>(
                 redirect_to_merchant_with_http_post: false,
                 publishable_key: None,
                 storage_scheme: enums::MerchantStorageScheme::PostgresOnly,
+                locker_id: None,
             })
         }
 
diff --git a/crates/router/src/types/api/mandates.rs b/crates/router/src/types/api/mandates.rs
index f38b96e06f..68dadc8d8d 100644
--- a/crates/router/src/types/api/mandates.rs
+++ b/crates/router/src/types/api/mandates.rs
@@ -15,6 +15,7 @@ use crate::{
         storage::{self, enums as storage_enums},
         transformers::ForeignInto,
     },
+    utils::OptionExt,
 };
 
 newtype!(
@@ -24,12 +25,20 @@ newtype!(
 
 #[async_trait::async_trait]
 pub(crate) trait MandateResponseExt: Sized {
-    async fn from_db_mandate(state: &AppState, mandate: storage::Mandate) -> RouterResult<Self>;
+    async fn from_db_mandate(
+        state: &AppState,
+        mandate: storage::Mandate,
+        merchant_account: &storage::MerchantAccount,
+    ) -> RouterResult<Self>;
 }
 
 #[async_trait::async_trait]
 impl MandateResponseExt for MandateResponse {
-    async fn from_db_mandate(state: &AppState, mandate: storage::Mandate) -> RouterResult<Self> {
+    async fn from_db_mandate(
+        state: &AppState,
+        mandate: storage::Mandate,
+        merchant_account: &storage::MerchantAccount,
+    ) -> RouterResult<Self> {
         let db = &*state.store;
         let payment_method = db
             .find_payment_method(&mandate.payment_method_id)
@@ -39,9 +48,13 @@ impl MandateResponseExt for MandateResponse {
             })?;
 
         let card = if payment_method.payment_method == storage_enums::PaymentMethodType::Card {
+            let locker_id = merchant_account
+                .locker_id
+                .to_owned()
+                .get_required_value("locker_id")?;
             let get_card_resp = payment_methods::cards::get_card_from_legacy_locker(
                 state,
-                &payment_method.merchant_id,
+                &locker_id,
                 &payment_method.payment_method_id,
             )
             .await?;
diff --git a/crates/storage_models/src/merchant_account.rs b/crates/storage_models/src/merchant_account.rs
index 3f72800dcf..6fca810056 100644
--- a/crates/storage_models/src/merchant_account.rs
+++ b/crates/storage_models/src/merchant_account.rs
@@ -22,6 +22,7 @@ pub struct MerchantAccount {
     pub parent_merchant_id: Option<String>,
     pub publishable_key: Option<String>,
     pub storage_scheme: storage_enums::MerchantStorageScheme,
+    pub locker_id: Option<String>,
 }
 
 #[derive(Clone, Debug, Default, Insertable, router_derive::DebugAsDisplay)]
@@ -41,6 +42,7 @@ pub struct MerchantAccountNew {
     pub payment_response_hash_key: Option<String>,
     pub redirect_to_merchant_with_http_post: Option<bool>,
     pub publishable_key: Option<String>,
+    pub locker_id: Option<String>,
 }
 
 #[derive(Debug)]
@@ -60,6 +62,7 @@ pub enum MerchantAccountUpdate {
         payment_response_hash_key: Option<String>,
         redirect_to_merchant_with_http_post: Option<bool>,
         publishable_key: Option<String>,
+        locker_id: Option<String>,
     },
 }
 
@@ -80,6 +83,7 @@ pub struct MerchantAccountUpdateInternal {
     payment_response_hash_key: Option<String>,
     redirect_to_merchant_with_http_post: Option<bool>,
     publishable_key: Option<String>,
+    locker_id: Option<String>,
 }
 
 impl From<MerchantAccountUpdate> for MerchantAccountUpdateInternal {
@@ -100,6 +104,7 @@ impl From<MerchantAccountUpdate> for MerchantAccountUpdateInternal {
                 payment_response_hash_key,
                 redirect_to_merchant_with_http_post,
                 publishable_key,
+                locker_id,
             } => Self {
                 merchant_id: Some(merchant_id),
                 merchant_name,
@@ -115,6 +120,7 @@ impl From<MerchantAccountUpdate> for MerchantAccountUpdateInternal {
                 payment_response_hash_key,
                 redirect_to_merchant_with_http_post,
                 publishable_key,
+                locker_id,
             },
         }
     }
diff --git a/crates/storage_models/src/schema.rs b/crates/storage_models/src/schema.rs
index 88adb01fb8..298a995614 100644
--- a/crates/storage_models/src/schema.rs
+++ b/crates/storage_models/src/schema.rs
@@ -159,6 +159,7 @@ diesel::table! {
         parent_merchant_id -> Nullable<Varchar>,
         publishable_key -> Nullable<Varchar>,
         storage_scheme -> MerchantStorageScheme,
+        locker_id -> Nullable<Varchar>,
     }
 }
 
diff --git a/migrations/2023-01-03-122401_update_merchant_account/down.sql b/migrations/2023-01-03-122401_update_merchant_account/down.sql
new file mode 100644
index 0000000000..581e025dc7
--- /dev/null
+++ b/migrations/2023-01-03-122401_update_merchant_account/down.sql
@@ -0,0 +1,3 @@
+-- This file should undo anything in `up.sql`
+ALTER TABLE merchant_account
+DROP COLUMN locker_id;
\ No newline at end of file
diff --git a/migrations/2023-01-03-122401_update_merchant_account/up.sql b/migrations/2023-01-03-122401_update_merchant_account/up.sql
new file mode 100644
index 0000000000..1c7ce757be
--- /dev/null
+++ b/migrations/2023-01-03-122401_update_merchant_account/up.sql
@@ -0,0 +1,3 @@
+-- Your SQL goes here
+ALTER TABLE merchant_account
+ADD COLUMN locker_id VARCHAR(64);
\ No newline at end of file