add email in authn flow

crates/router/src/connector/threedsecureio/transformers.rs

@@ -503,6 +503,7 @@ impl TryFrom<&ThreedsecureioRouterData<&types::ConnectorAuthenticationRouterData
                 DeviceChannel::BRW => None,
             },
             cardholder_name: card_details.card_holder_name,
+            email: request.email.clone(),
         })
     }
 }
@@ -580,7 +581,7 @@ pub struct ThreedsecureioAuthenticationRequest {
     pub bill_addr_line1: String,
     pub bill_addr_post_code: String,
     pub bill_addr_state: String,
-    // pub email: Email,
+    pub email: Option<common_utils::pii::Email>,
     pub three_dsrequestor_authentication_ind: String,
     pub cardholder_name: Option<Secret<String>>,
     pub device_channel: String,

crates/router/src/core/authentication.rs

@@ -35,6 +35,7 @@ pub async fn perform_authentication(
     authentication_data: (types::AuthenticationData, storage::Authentication),
     return_url: Option<String>,
     sdk_information: Option<payments::SDKInformation>,
+    email: Option<common_utils::pii::Email>,
 ) -> CustomResult<core_types::api::authentication::AuthenticationResponse, ApiErrorResponse> {
     let router_data = transformers::construct_authentication_router_data(
         authentication_connector.clone(),
@@ -52,6 +53,7 @@ pub async fn perform_authentication(
         authentication_data.clone(),
         return_url,
         sdk_information,
+        email,
     )?;
     let response =
         utils::do_auth_connector_call(state, authentication_connector.clone(), router_data).await?;

crates/router/src/core/authentication/transformers.rs

@@ -37,6 +37,7 @@ pub fn construct_authentication_router_data(
     authentication_data: (super::types::AuthenticationData, storage::Authentication),
     return_url: Option<String>,
     sdk_information: Option<api_models::payments::SDKInformation>,
+    email: Option<common_utils::pii::Email>,
 ) -> RouterResult<types::ConnectorAuthenticationRouterData> {
     let router_request = types::ConnectorAuthenticationRequestData {
         payment_method_data,
@@ -50,6 +51,7 @@ pub fn construct_authentication_router_data(
         authentication_data,
         return_url,
         sdk_information,
+        email,
     };
     construct_router_data(
         authentication_connector,

crates/router/src/core/payments.rs

@@ -3082,6 +3082,23 @@ pub async fn payment_external_authentication(
         &[storage_enums::IntentStatus::RequiresCustomerAction],
         "authenticate",
     )?;
+    let optional_customer = match &payment_intent.customer_id {
+        Some(customer_id) => Some(
+            state
+                .store
+                .find_customer_by_customer_id_merchant_id(
+                    &customer_id,
+                    &merchant_account.merchant_id,
+                    &key_store,
+                )
+                .await
+                .change_context(errors::ApiErrorResponse::InternalServerError)
+                .attach_printable_lazy(|| {
+                    "error while finding customer with customer_id {customer_id}"
+                })?,
+        ),
+        None => None,
+    };
     let profile_id = payment_intent
         .profile_id
         .as_ref()
@@ -3198,6 +3215,7 @@ pub async fn payment_external_authentication(
         (authentication_data, authentication),
         return_url,
         req.sdk_information,
+        optional_customer.and_then(|customer| customer.email.map(common_utils::pii::Email::from)),
     )
     .await?;
     Ok(services::ApplicationResponse::Json(

crates/router/src/types.rs

@@ -1074,6 +1074,7 @@ pub struct ConnectorAuthenticationRequestData {
     ),
     pub return_url: Option<String>,
     pub sdk_information: Option<api_models::payments::SDKInformation>,
+    pub email: Option<Email>,
 }
 
 #[derive(Clone, Debug)]