diff --git a/crates/router/src/core/payments.rs b/crates/router/src/core/payments.rs
index 1082c85ad3..80958f641b 100644
--- a/crates/router/src/core/payments.rs
+++ b/crates/router/src/core/payments.rs
@@ -49,6 +49,7 @@ pub async fn payments_operation_core<F, Req, Op, FData>(
     operation: Op,
     req: Req,
     call_connector_action: CallConnectorAction,
+    auth_flow: services::AuthFlow,
 ) -> RouterResult<(PaymentData<F>, Req, Option<domain::Customer>)>
 where
     F: Send + Clone + Sync,
@@ -70,7 +71,6 @@ where
     let operation: BoxedOperation<'_, F, Req> = Box::new(operation);
 
     tracing::Span::current().record("merchant_id", merchant_account.merchant_id.as_str());
-
     let (operation, validate_result) = operation
         .to_validate_request()?
         .validate_request(&req, &merchant_account)?;
@@ -85,6 +85,7 @@ where
             validate_result.mandate_type.to_owned(),
             &merchant_account,
             &key_store,
+            auth_flow,
         )
         .await?;
 
@@ -246,6 +247,7 @@ where
         operation.clone(),
         req,
         call_connector_action,
+        auth_flow,
     )
     .await?;
 
diff --git a/crates/router/src/core/payments/helpers.rs b/crates/router/src/core/payments/helpers.rs
index ba3d0432b5..8fd6321049 100644
--- a/crates/router/src/core/payments/helpers.rs
+++ b/crates/router/src/core/payments/helpers.rs
@@ -2550,3 +2550,28 @@ pub async fn get_additional_payment_data(
         }
     }
 }
+
+pub fn validate_customer_access(
+    payment_intent: &storage::PaymentIntent,
+    auth_flow: services::AuthFlow,
+    request: &api::PaymentsRequest,
+) -> Result<(), errors::ApiErrorResponse> {
+    if auth_flow == services::AuthFlow::Client && request.customer_id.is_some() {
+        let is_not_same_customer = request
+            .clone()
+            .customer_id
+            .and_then(|customer| {
+                payment_intent
+                    .clone()
+                    .customer_id
+                    .map(|payment_customer| payment_customer != customer)
+            })
+            .unwrap_or(false);
+        if is_not_same_customer {
+            Err(errors::ApiErrorResponse::GenericUnauthorized {
+                message: "Unauthorised access to update customer".to_string(),
+            })?;
+        }
+    }
+    Ok(())
+}
diff --git a/crates/router/src/core/payments/operations.rs b/crates/router/src/core/payments/operations.rs
index 21d4846a7c..bbbebfa8ef 100644
--- a/crates/router/src/core/payments/operations.rs
+++ b/crates/router/src/core/payments/operations.rs
@@ -26,6 +26,7 @@ use crate::{
     core::errors::{self, CustomResult, RouterResult},
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         self, api, domain,
         storage::{self, enums},
@@ -94,6 +95,7 @@ pub trait GetTracker<F, D, R>: Send {
         mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         mechant_key_store: &domain::MerchantKeyStore,
+        auth_flow: services::AuthFlow,
     ) -> 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 c21b545737..8256de6982 100644
--- a/crates/router/src/core/payments/operations/payment_cancel.rs
+++ b/crates/router/src/core/payments/operations/payment_cancel.rs
@@ -14,6 +14,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api::{self, PaymentIdTypeExt},
         domain,
@@ -37,6 +38,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsCancelRequest>
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsCancelRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_capture.rs b/crates/router/src/core/payments/operations/payment_capture.rs
index 16002726ca..4984dbd0f0 100644
--- a/crates/router/src/core/payments/operations/payment_capture.rs
+++ b/crates/router/src/core/payments/operations/payment_capture.rs
@@ -13,6 +13,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api::{self, PaymentIdTypeExt},
         domain,
@@ -38,6 +39,7 @@ impl<F: Send + Clone> GetTracker<F, payments::PaymentData<F>, api::PaymentsCaptu
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsCaptureRequest>,
         payments::PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_complete_authorize.rs b/crates/router/src/core/payments/operations/payment_complete_authorize.rs
index 8c4c1688c0..6c16eb85de 100644
--- a/crates/router/src/core/payments/operations/payment_complete_authorize.rs
+++ b/crates/router/src/core/payments/operations/payment_complete_authorize.rs
@@ -14,6 +14,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         self,
         api::{self, PaymentIdTypeExt},
@@ -39,6 +40,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Co
         mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_confirm.rs b/crates/router/src/core/payments/operations/payment_confirm.rs
index 434b9444ac..301fd23006 100644
--- a/crates/router/src/core/payments/operations/payment_confirm.rs
+++ b/crates/router/src/core/payments/operations/payment_confirm.rs
@@ -15,6 +15,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         self,
         api::{self, PaymentIdTypeExt},
@@ -28,7 +29,6 @@ use crate::{
 #[derive(Debug, Clone, Copy, PaymentOperation)]
 #[operation(ops = "all", flow = "authorize")]
 pub struct PaymentConfirm;
-
 #[async_trait]
 impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for PaymentConfirm {
     #[instrument(skip_all)]
@@ -40,6 +40,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
@@ -59,6 +60,8 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
             .await
             .to_not_found_response(errors::ApiErrorResponse::PaymentNotFound)?;
 
+        helpers::validate_customer_access(&payment_intent, auth_flow, request)?;
+
         helpers::validate_payment_status_against_not_allowed_statuses(
             &payment_intent.status,
             &[
@@ -499,7 +502,6 @@ impl<F: Send + Clone> ValidateRequest<F, api::PaymentsRequest> for PaymentConfir
         operations::ValidateResult<'a>,
     )> {
         helpers::validate_customer_details_in_request(request)?;
-
         let given_payment_id = match &request.payment_id {
             Some(id_type) => Some(
                 id_type
diff --git a/crates/router/src/core/payments/operations/payment_create.rs b/crates/router/src/core/payments/operations/payment_create.rs
index f5fc016a1e..b621e59c9b 100644
--- a/crates/router/src/core/payments/operations/payment_create.rs
+++ b/crates/router/src/core/payments/operations/payment_create.rs
@@ -46,6 +46,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         merchant_key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
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 be6e5a1437..34f5b66c18 100644
--- a/crates/router/src/core/payments/operations/payment_method_validate.rs
+++ b/crates/router/src/core/payments/operations/payment_method_validate.rs
@@ -16,6 +16,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         self,
         api::{self, enums as api_enums, PaymentIdTypeExt},
@@ -71,6 +72,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::VerifyRequest> for Paym
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         _mechant_key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::VerifyRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_session.rs b/crates/router/src/core/payments/operations/payment_session.rs
index a2f014fac7..4aa523e0d2 100644
--- a/crates/router/src/core/payments/operations/payment_session.rs
+++ b/crates/router/src/core/payments/operations/payment_session.rs
@@ -15,6 +15,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api::{self, PaymentIdTypeExt},
         domain,
@@ -40,6 +41,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsSessionRequest>
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsSessionRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_start.rs b/crates/router/src/core/payments/operations/payment_start.rs
index cb9cc845ed..282b89edc2 100644
--- a/crates/router/src/core/payments/operations/payment_start.rs
+++ b/crates/router/src/core/payments/operations/payment_start.rs
@@ -13,6 +13,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api::{self, PaymentIdTypeExt},
         domain,
@@ -36,6 +37,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsStartRequest> f
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         mechant_key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsStartRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_status.rs b/crates/router/src/core/payments/operations/payment_status.rs
index 4e8ae9d21b..bcb268eb4a 100644
--- a/crates/router/src/core/payments/operations/payment_status.rs
+++ b/crates/router/src/core/payments/operations/payment_status.rs
@@ -14,6 +14,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api, domain,
         storage::{self, enums},
@@ -163,6 +164,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRetrieveRequest
         _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        _auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRetrieveRequest>,
         PaymentData<F>,
diff --git a/crates/router/src/core/payments/operations/payment_update.rs b/crates/router/src/core/payments/operations/payment_update.rs
index 17171c8438..daeaeb32d7 100644
--- a/crates/router/src/core/payments/operations/payment_update.rs
+++ b/crates/router/src/core/payments/operations/payment_update.rs
@@ -15,6 +15,7 @@ use crate::{
     },
     db::StorageInterface,
     routes::AppState,
+    services,
     types::{
         api::{self, PaymentIdTypeExt},
         domain,
@@ -39,6 +40,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
+        auth_flow: services::AuthFlow,
     ) -> RouterResult<(
         BoxedOperation<'a, F, api::PaymentsRequest>,
         PaymentData<F>,
@@ -63,6 +65,8 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
             .setup_future_usage
             .or(payment_intent.setup_future_usage);
 
+        helpers::validate_customer_access(&payment_intent, auth_flow, request)?;
+
         helpers::validate_card_data(request.payment_method_data.clone())?;
 
         helpers::validate_payment_status_against_not_allowed_statuses(
@@ -548,7 +552,6 @@ impl<F: Send + Clone> ValidateRequest<F, api::PaymentsRequest> for PaymentUpdate
         operations::ValidateResult<'a>,
     )> {
         helpers::validate_customer_details_in_request(request)?;
-
         let given_payment_id = match &request.payment_id {
             Some(id_type) => Some(
                 id_type
diff --git a/crates/router/src/scheduler/workflows/payment_sync.rs b/crates/router/src/scheduler/workflows/payment_sync.rs
index b14cd8bc1b..805aeef316 100644
--- a/crates/router/src/scheduler/workflows/payment_sync.rs
+++ b/crates/router/src/scheduler/workflows/payment_sync.rs
@@ -7,6 +7,7 @@ use crate::{
     errors,
     routes::AppState,
     scheduler::{consumer, process_data, utils},
+    services,
     types::{
         api,
         storage::{self, enums, ProcessTrackerExt},
@@ -54,6 +55,7 @@ impl ProcessTrackerWorkflow for PaymentsSyncWorkflow {
             operations::PaymentStatus,
             tracking_data.clone(),
             payment_flows::CallConnectorAction::Trigger,
+            services::AuthFlow::Client,
         )
         .await?;