feat(payment_methods): pass required_billing_contact_fields field in /session call based on dynamic fields (#4601)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

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

@@ -538,6 +538,7 @@ impl TryFrom<types::PaymentsSessionResponseRouterData<BluesnapWalletTokenRespons
                             merchant_capabilities: Some(payment_request_data.merchant_capabilities),
                             supported_networks: Some(payment_request_data.supported_networks),
                             merchant_identifier: Some(session_token_data.merchant_identifier),
+                            required_billing_contact_fields: None,
                         }),
                         connector: "bluesnap".to_string(),
                         delayed_session_token: false,

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

@@ -550,6 +550,7 @@ impl<F>
                                     merchant_capabilities: None,
                                     supported_networks: None,
                                     merchant_identifier: None,
+                                    required_billing_contact_fields: None,
                                 },
                             ),
                             connector: "payme".to_string(),

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

@@ -1223,6 +1223,7 @@ pub fn get_apple_pay_session<F, T>(
                         ),
                         total: apple_pay_init_result.total.into(),
                         merchant_identifier: None,
+                        required_billing_contact_fields: None,
                     }),
                     connector: "trustpay".to_string(),
                     delayed_session_token: true,
@@ -1326,6 +1327,8 @@ impl From<GpayAllowedMethodsParameters> for api_models::payments::GpayAllowedMet
         Self {
             allowed_auth_methods: value.allowed_auth_methods,
             allowed_card_networks: value.allowed_card_networks,
+            billing_address_required: None,
+            billing_address_parameters: None,
         }
     }
 }

crates/router/src/core/payments/flows/session_flow.rs

@@ -11,9 +11,13 @@ use crate::{
         payments::{self, access_token, helpers, transformers, PaymentData},
     },
     headers, logger,
-    routes::{self, metrics},
+    routes::{self, app::settings, metrics},
     services,
-    types::{self, api, domain},
+    types::{
+        self,
+        api::{self, enums},
+        domain,
+    },
     utils::OptionExt,
 };
 
@@ -78,6 +82,39 @@ impl Feature<api::Session, types::PaymentsSessionData> for types::PaymentsSessio
     }
 }
 
+/// This function checks if for a given connector, payment_method and payment_method_type,
+/// the list of required_field_type is present in dynamic fields
+fn is_dynamic_fields_required(
+    required_fields: &settings::RequiredFields,
+    payment_method: enums::PaymentMethod,
+    payment_method_type: enums::PaymentMethodType,
+    connector: &types::Connector,
+    required_field_type: Vec<enums::FieldType>,
+) -> bool {
+    required_fields
+        .0
+        .get(&payment_method)
+        .and_then(|pm_type| pm_type.0.get(&payment_method_type))
+        .and_then(|required_fields_for_connector| {
+            required_fields_for_connector.fields.get(connector)
+        })
+        .map(|required_fields_final| {
+            required_fields_final
+                .non_mandate
+                .iter()
+                .any(|(_, val)| required_field_type.contains(&val.field_type))
+                || required_fields_final
+                    .mandate
+                    .iter()
+                    .any(|(_, val)| required_field_type.contains(&val.field_type))
+                || required_fields_final
+                    .common
+                    .iter()
+                    .any(|(_, val)| required_field_type.contains(&val.field_type))
+        })
+        .unwrap_or(false)
+}
+
 fn get_applepay_metadata(
     connector_metadata: Option<common_utils::pii::SecretSerdeValue>,
 ) -> RouterResult<payment_types::ApplepaySessionTokenMetadata> {
@@ -247,6 +284,20 @@ async fn create_applepay_session_token(
             router_data.request.to_owned(),
         )?;
 
+        let billing_variants = enums::FieldType::get_billing_variants();
+
+        let required_billing_contact_fields = if is_dynamic_fields_required(
+            &state.conf.required_fields,
+            enums::PaymentMethod::Wallet,
+            enums::PaymentMethodType::ApplePay,
+            &connector.connector_name,
+            billing_variants,
+        ) {
+            Some(vec!["postalAddress".to_string()])
+        } else {
+            None
+        };
+
         // Get apple pay payment request
         let applepay_payment_request = get_apple_pay_payment_request(
             amount_info,
@@ -254,6 +305,7 @@ async fn create_applepay_session_token(
             router_data.request.to_owned(),
             apple_pay_session_request.merchant_identifier.as_str(),
             merchant_business_country,
+            required_billing_contact_fields,
         )?;
 
         let applepay_session_request = build_apple_pay_session_request(
@@ -354,6 +406,7 @@ fn get_apple_pay_payment_request(
     session_data: types::PaymentsSessionData,
     merchant_identifier: &str,
     merchant_business_country: Option<api_models::enums::CountryAlpha2>,
+    required_billing_contact_fields: Option<Vec<String>>,
 ) -> RouterResult<payment_types::ApplePayPaymentRequest> {
     let applepay_payment_request = payment_types::ApplePayPaymentRequest {
         country_code: merchant_business_country.or(session_data.country).ok_or(
@@ -366,6 +419,7 @@ fn get_apple_pay_payment_request(
         merchant_capabilities: Some(payment_request_data.merchant_capabilities),
         supported_networks: Some(payment_request_data.supported_networks),
         merchant_identifier: Some(merchant_identifier.to_string()),
+        required_billing_contact_fields,
     };
     Ok(applepay_payment_request)
 }
@@ -443,6 +497,38 @@ fn create_gpay_session_token(
                 expected_format: "gpay_metadata_format".to_string(),
             })?;
 
+        let billing_variants = enums::FieldType::get_billing_variants();
+
+        let is_billing_details_required = is_dynamic_fields_required(
+            &state.conf.required_fields,
+            enums::PaymentMethod::Wallet,
+            enums::PaymentMethodType::GooglePay,
+            &connector.connector_name,
+            billing_variants,
+        );
+
+        let billing_address_parameters =
+            is_billing_details_required.then_some(payment_types::GpayBillingAddressParameters {
+                phone_number_required: is_billing_details_required,
+                format: payment_types::GpayBillingAddressFormat::FULL,
+            });
+
+        let gpay_allowed_payment_methods = gpay_data
+            .data
+            .allowed_payment_methods
+            .into_iter()
+            .map(
+                |allowed_payment_methods| payment_types::GpayAllowedPaymentMethods {
+                    parameters: payment_types::GpayAllowedMethodsParameters {
+                        billing_address_required: Some(is_billing_details_required),
+                        billing_address_parameters: billing_address_parameters.clone(),
+                        ..allowed_payment_methods.parameters
+                    },
+                    ..allowed_payment_methods
+                },
+            )
+            .collect();
+
         let session_data = router_data.request.clone();
         let transaction_info = payment_types::GpayTransactionInfo {
             country_code: session_data.country.unwrap_or_default(),
@@ -466,7 +552,7 @@ fn create_gpay_session_token(
                     payment_types::GpaySessionTokenResponse::GooglePaySession(
                         payment_types::GooglePaySessionResponse {
                             merchant_info: gpay_data.data.merchant_info,
-                            allowed_payment_methods: gpay_data.data.allowed_payment_methods,
+                            allowed_payment_methods: gpay_allowed_payment_methods,
                             transaction_info,
                             connector: connector.connector_name.to_string(),
                             sdk_next_action: payment_types::SdkNextAction {