Issue:
Bug: open router integration of success rate based routing



add an api integration with open-router service.
* decide-gateway
* update-gateway-score

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [x] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
This PR adds an api integration with open-router service.
* decide-gateway
* update-gateway-score

### 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
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
Create merchant_account, api_key, mca 
1. Enable SR for merchant
```
curl --location --request POST 'http://localhost:8080/account/merchant_1744368166/business_profile/pro_GrzjTHd5Pn5hAhwTZPRn/dynamic_routing/success_based/toggle?enable=dynamic_connector_selection' \
--header 'api-key: dev_a4XMpNXd3Yriz5DPsiwU6UbxEkiRkXdqHhwnJPolnVhssLaDEbOg6f5kE6B2hx1f'
```
2. Enable Volume split
```
curl --location --request POST 'http://localhost:8080/account/merchant_1744368166/business_profile/pro_GrzjTHd5Pn5hAhwTZPRn/dynamic_routing/set_volume_split?split=100' \
--header 'api-key: dev_a4XMpNXd3Yriz5DPsiwU6UbxEkiRkXdqHhwnJPolnVhssLaDEbOg6f5kE6B2hx1f'
```
3. Create a Payment
Search for the log "Open router gateway_priority_map response"
<img width="1360" alt="image" src="https://github.com/user-attachments/assets/b7c8e95e-3661-4097-bd25-3072148449ed" />
<img width="1364" alt="image" src="https://github.com/user-attachments/assets/be8ad1d1-38a8-408f-99c6-82816ae202fe" />



## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:

Create merchant_account, api_key, mca 
1. Enable SR for merchant
```
curl --location --request POST 'http://localhost:8080/account/merchant_1744368166/business_profile/pro_GrzjTHd5Pn5hAhwTZPRn/dynamic_routing/success_based/toggle?enable=dynamic_connector_selection' \
--header 'api-key: dev_a4XMpNXd3Yriz5DPsiwU6UbxEkiRkXdqHhwnJPolnVhssLaDEbOg6f5kE6B2hx1f'
```
2. Enable Volume split
```
curl --location --request POST 'http://localhost:8080/account/merchant_1744368166/business_profile/pro_GrzjTHd5Pn5hAhwTZPRn/dynamic_routing/set_volume_split?split=100' \
--header 'api-key: dev_a4XMpNXd3Yriz5DPsiwU6UbxEkiRkXdqHhwnJPolnVhssLaDEbOg6f5kE6B2hx1f'
```
3. Create a Payment
Search for the log "Open router gateway_priority_map response"
<img width="1360" alt="image" src="https://github.com/user-attachments/assets/b7c8e95e-3661-4097-bd25-3072148449ed" />
<img width="1364" alt="image" src="https://github.com/user-attachments/assets/be8ad1d1-38a8-408f-99c6-82816ae202fe" />

Patch:
diff --git a/config/config.example.toml b/config/config.example.toml
index 11d64093ab6..0ff30da45f4 100644
--- a/config/config.example.toml
+++ b/config/config.example.toml
@@ -969,4 +969,8 @@ primary_color = "#006DF9"
 background_color = "#FFFFFF"                                                     # Email background color
 
 [billing_connectors_payment_sync]
-billing_connectors_which_require_payment_sync = "stripebilling, recurly" # List of billing connectors which has payment sync api call
\ No newline at end of file
+billing_connectors_which_require_payment_sync = "stripebilling, recurly" # List of billing connectors which has payment sync api call
+
+[open_router]
+enabled = true                          # Enable or disable Open Router
+url = "http://localhost:8080"           # Open Router URL
diff --git a/config/development.toml b/config/development.toml
index 535850f0d9b..b2a9f7c7cbd 100644
--- a/config/development.toml
+++ b/config/development.toml
@@ -1033,3 +1033,7 @@ background_color = "#FFFFFF"
 
 [platform]
 enabled = true
+
+[open_router]
+enabled = false
+url = "http://localhost:8080"
diff --git a/config/docker_compose.toml b/config/docker_compose.toml
index c8d01502899..05685fcc5fc 100644
--- a/config/docker_compose.toml
+++ b/config/docker_compose.toml
@@ -788,9 +788,9 @@ enabled = false
 global_tenant = { tenant_id = "global", schema = "public", redis_key_prefix = "", clickhouse_database = "default" }
 
 [multitenancy.tenants.public]
-base_url = "http://localhost:8080" 
-schema = "public"    
-accounts_schema = "public" 
+base_url = "http://localhost:8080"
+schema = "public"
+accounts_schema = "public"
 redis_key_prefix = ""
 clickhouse_database = "default"
 
@@ -874,3 +874,6 @@ background_color = "#FFFFFF"
 
 [platform]
 enabled = true
+
+[open_router]
+enabled = false
diff --git a/crates/api_models/src/lib.rs b/crates/api_models/src/lib.rs
index 171bcb67753..1d5bfd58467 100644
--- a/crates/api_models/src/lib.rs
+++ b/crates/api_models/src/lib.rs
@@ -23,6 +23,8 @@ pub mod gsm;
 pub mod health_check;
 pub mod locker_migration;
 pub mod mandates;
+#[cfg(feature = "dynamic_routing")]
+pub mod open_router;
 pub mod organization;
 pub mod payment_methods;
 pub mod payments;
diff --git a/crates/api_models/src/open_router.rs b/crates/api_models/src/open_router.rs
new file mode 100644
index 00000000000..c33365df169
--- /dev/null
+++ b/crates/api_models/src/open_router.rs
@@ -0,0 +1,122 @@
+use std::{collections::HashMap, fmt::Debug};
+
+use common_utils::{id_type, types::MinorUnit};
+pub use euclid::{
+    dssa::types::EuclidAnalysable,
+    frontend::{
+        ast,
+        dir::{DirKeyKind, EuclidDirFilter},
+    },
+};
+use serde::{Deserialize, Serialize};
+
+use crate::enums::{Currency, PaymentMethod, RoutableConnectors};
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct OpenRouterDecideGatewayRequest {
+    pub payment_info: PaymentInfo,
+    pub merchant_id: id_type::ProfileId,
+    pub eligible_gateway_list: Option<Vec<RoutableConnectors>>,
+    pub ranking_algorithm: Option<RankingAlgorithm>,
+    pub elimination_enabled: Option<bool>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum RankingAlgorithm {
+    SrBasedRouting,
+    PlBasedRouting,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PaymentInfo {
+    pub payment_id: id_type::PaymentId,
+    pub amount: MinorUnit,
+    pub currency: Currency,
+    // customerId: Option<ETCu::CustomerId>,
+    // preferredGateway: Option<ETG::Gateway>,
+    pub payment_type: String,
+    // metadata: Option<String>,
+    // internalMetadata: Option<String>,
+    // isEmi: Option<bool>,
+    // emiBank: Option<String>,
+    // emiTenure: Option<i32>,
+    pub payment_method_type: String,
+    pub payment_method: PaymentMethod,
+    // paymentSource: Option<String>,
+    // authType: Option<ETCa::txn_card_info::AuthType>,
+    // cardIssuerBankName: Option<String>,
+    // cardIsin: Option<String>,
+    // cardType: Option<ETCa::card_type::CardType>,
+    // cardSwitchProvider: Option<Secret<String>>,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+pub struct DecidedGateway {
+    pub gateway_priority_map: Option<HashMap<String, f64>>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct ErrorResponse {
+    pub status: String,
+    pub error_code: String,
+    pub error_message: String,
+    pub priority_logic_tag: Option<String>,
+    pub filter_wise_gateways: Option<serde_json::Value>,
+    pub error_info: UnifiedError,
+    pub is_dynamic_mga_enabled: bool,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct UnifiedError {
+    pub code: String,
+    pub user_message: String,
+    pub developer_message: String,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct UpdateScorePayload {
+    pub merchant_id: id_type::ProfileId,
+    pub gateway: RoutableConnectors,
+    pub status: TxnStatus,
+    pub payment_id: id_type::PaymentId,
+}
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum TxnStatus {
+    Started,
+    AuthenticationFailed,
+    JuspayDeclined,
+    PendingVBV,
+    VBVSuccessful,
+    Authorized,
+    AuthorizationFailed,
+    Charged,
+    Authorizing,
+    CODInitiated,
+    Voided,
+    VoidInitiated,
+    Nop,
+    CaptureInitiated,
+    CaptureFailed,
+    VoidFailed,
+    AutoRefunded,
+    PartialCharged,
+    ToBeCharged,
+    Pending,
+    Failure,
+    Declined,
+}
+
+impl From<bool> for TxnStatus {
+    fn from(value: bool) -> Self {
+        match value {
+            true => Self::Charged,
+            _ => Self::Failure,
+        }
+    }
+}
diff --git a/crates/router/src/configs/secrets_transformers.rs b/crates/router/src/configs/secrets_transformers.rs
index 7cd4ce2d4bd..1dfaf1e84ac 100644
--- a/crates/router/src/configs/secrets_transformers.rs
+++ b/crates/router/src/configs/secrets_transformers.rs
@@ -550,5 +550,6 @@ pub(crate) async fn fetch_raw_secrets(
         network_tokenization_supported_connectors: conf.network_tokenization_supported_connectors,
         theme: conf.theme,
         platform: conf.platform,
+        open_router: conf.open_router,
     }
 }
diff --git a/crates/router/src/configs/settings.rs b/crates/router/src/configs/settings.rs
index 83591b15e36..de0bafcdd3d 100644
--- a/crates/router/src/configs/settings.rs
+++ b/crates/router/src/configs/settings.rs
@@ -139,8 +139,14 @@ pub struct Settings<S: SecretState> {
     pub network_tokenization_supported_connectors: NetworkTokenizationSupportedConnectors,
     pub theme: ThemeSettings,
     pub platform: Platform,
+    pub open_router: OpenRouter,
 }
 
+#[derive(Debug, Deserialize, Clone, Default)]
+pub struct OpenRouter {
+    pub enabled: bool,
+    pub url: String,
+}
 #[derive(Debug, Deserialize, Clone, Default)]
 pub struct Platform {
     pub enabled: bool,
diff --git a/crates/router/src/core/errors.rs b/crates/router/src/core/errors.rs
index a574d84fdcb..622802a5b0a 100644
--- a/crates/router/src/core/errors.rs
+++ b/crates/router/src/core/errors.rs
@@ -407,6 +407,10 @@ pub enum RoutingError {
     ContractRoutingClientInitializationError,
     #[error("Invalid contract based connector label received from dynamic routing service: '{0}'")]
     InvalidContractBasedConnectorLabel(String),
+    #[error("Failed to perform {algo} in open_router")]
+    OpenRouterCallFailed { algo: String },
+    #[error("Error from open_router: {0}")]
+    OpenRouterError(String),
 }
 
 #[derive(Debug, Clone, thiserror::Error)]
diff --git a/crates/router/src/core/payments.rs b/crates/router/src/core/payments.rs
index 38f4823e068..40b2e34d612 100644
--- a/crates/router/src/core/payments.rs
+++ b/crates/router/src/core/payments.rs
@@ -7268,6 +7268,9 @@ where
     .await
     .change_context(errors::ApiErrorResponse::InternalServerError)?;
 
+    #[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+    let payment_attempt = transaction_data.payment_attempt.clone();
+
     let connectors = routing::perform_eligibility_analysis_with_fallback(
         &state.clone(),
         key_store,
@@ -7282,33 +7285,42 @@ where
 
     // dynamic success based connector selection
     #[cfg(all(feature = "v1", feature = "dynamic_routing"))]
-    let connectors = {
-        if let Some(algo) = business_profile.dynamic_routing_algorithm.clone() {
-            let dynamic_routing_config: api_models::routing::DynamicRoutingAlgorithmRef = algo
-                .parse_value("DynamicRoutingAlgorithmRef")
-                .change_context(errors::ApiErrorResponse::InternalServerError)
-                .attach_printable("unable to deserialize DynamicRoutingAlgorithmRef from JSON")?;
-            let dynamic_split = api_models::routing::RoutingVolumeSplit {
-                routing_type: api_models::routing::RoutingType::Dynamic,
-                split: dynamic_routing_config
-                    .dynamic_routing_volume_split
-                    .unwrap_or_default(),
+    let connectors = if let Some(algo) = business_profile.dynamic_routing_algorithm.clone() {
+        let dynamic_routing_config: api_models::routing::DynamicRoutingAlgorithmRef = algo
+            .parse_value("DynamicRoutingAlgorithmRef")
+            .change_context(errors::ApiErrorResponse::InternalServerError)
+            .attach_printable("unable to deserialize DynamicRoutingAlgorithmRef from JSON")?;
+        let dynamic_split = api_models::routing::RoutingVolumeSplit {
+            routing_type: api_models::routing::RoutingType::Dynamic,
+            split: dynamic_routing_config
+                .dynamic_routing_volume_split
+                .unwrap_or_default(),
+        };
+        let static_split: api_models::routing::RoutingVolumeSplit =
+            api_models::routing::RoutingVolumeSplit {
+                routing_type: api_models::routing::RoutingType::Static,
+                split: consts::DYNAMIC_ROUTING_MAX_VOLUME
+                    - dynamic_routing_config
+                        .dynamic_routing_volume_split
+                        .unwrap_or_default(),
             };
-            let static_split: api_models::routing::RoutingVolumeSplit =
-                api_models::routing::RoutingVolumeSplit {
-                    routing_type: api_models::routing::RoutingType::Static,
-                    split: consts::DYNAMIC_ROUTING_MAX_VOLUME
-                        - dynamic_routing_config
-                            .dynamic_routing_volume_split
-                            .unwrap_or_default(),
-                };
-            let volume_split_vec = vec![dynamic_split, static_split];
-            let routing_choice =
-                routing::perform_dynamic_routing_volume_split(volume_split_vec, None)
-                    .change_context(errors::ApiErrorResponse::InternalServerError)
-                    .attach_printable("failed to perform volume split on routing type")?;
+        let volume_split_vec = vec![dynamic_split, static_split];
+        let routing_choice = routing::perform_dynamic_routing_volume_split(volume_split_vec, None)
+            .change_context(errors::ApiErrorResponse::InternalServerError)
+            .attach_printable("failed to perform volume split on routing type")?;
 
-            if routing_choice.routing_type.is_dynamic_routing() {
+        if routing_choice.routing_type.is_dynamic_routing() {
+            if state.conf.open_router.enabled {
+                routing::perform_open_routing(
+                    state,
+                    connectors.clone(),
+                    business_profile,
+                    payment_attempt,
+                )
+                .await
+                .map_err(|e| logger::error!(open_routing_error=?e))
+                .unwrap_or(connectors)
+            } else {
                 let dynamic_routing_config_params_interpolator =
                     routing_helpers::DynamicRoutingConfigParamsInterpolator::new(
                         payment_data.get_payment_attempt().payment_method,
@@ -7350,12 +7362,12 @@ where
                 .await
                 .map_err(|e| logger::error!(dynamic_routing_error=?e))
                 .unwrap_or(connectors)
-            } else {
-                connectors
             }
         } else {
             connectors
         }
+    } else {
+        connectors
     };
 
     let connector_data = connectors
diff --git a/crates/router/src/core/payments/routing.rs b/crates/router/src/core/payments/routing.rs
index 889525ec6d5..4db49e8d44f 100644
--- a/crates/router/src/core/payments/routing.rs
+++ b/crates/router/src/core/payments/routing.rs
@@ -6,15 +6,21 @@ use std::collections::hash_map;
 use std::hash::{Hash, Hasher};
 use std::{collections::HashMap, str::FromStr, sync::Arc};
 
-#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
-use api_models::routing as api_routing;
 use api_models::{
     admin as admin_api,
     enums::{self as api_enums, CountryAlpha2},
     routing::ConnectorSelection,
 };
-#[cfg(feature = "dynamic_routing")]
-use common_utils::ext_traits::AsyncExt;
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use api_models::{
+    open_router::{self as or_types, DecidedGateway, OpenRouterDecideGatewayRequest},
+    routing as api_routing,
+};
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use common_utils::{
+    ext_traits::{AsyncExt, BytesExt},
+    request,
+};
 use diesel_models::enums as storage_enums;
 use error_stack::ResultExt;
 use euclid::{
@@ -48,11 +54,10 @@ use storage_impl::redis::cache::{CacheKey, CGRAPH_CACHE, ROUTING_CACHE};
 use crate::core::admin;
 #[cfg(feature = "payouts")]
 use crate::core::payouts;
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use crate::{core::routing::transformers::OpenRouterDecideGatewayRequestExt, headers, services};
 use crate::{
-    core::{
-        errors, errors as oss_errors,
-        routing::{self},
-    },
+    core::{errors, errors as oss_errors, routing},
     logger,
     types::{
         api::{self, routing as routing_types},
@@ -1484,6 +1489,53 @@ pub fn make_dsl_input_for_surcharge(
     Ok(backend_input)
 }
 
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+pub async fn perform_open_routing(
+    state: &SessionState,
+    routable_connectors: Vec<api_routing::RoutableConnectorChoice>,
+    profile: &domain::Profile,
+    payment_data: oss_storage::PaymentAttempt,
+) -> RoutingResult<Vec<api_routing::RoutableConnectorChoice>> {
+    let dynamic_routing_algo_ref: api_routing::DynamicRoutingAlgorithmRef = profile
+        .dynamic_routing_algorithm
+        .clone()
+        .map(|val| val.parse_value("DynamicRoutingAlgorithmRef"))
+        .transpose()
+        .change_context(errors::RoutingError::DeserializationError {
+            from: "JSON".to_string(),
+            to: "DynamicRoutingAlgorithmRef".to_string(),
+        })
+        .attach_printable("unable to deserialize DynamicRoutingAlgorithmRef from JSON")?
+        .ok_or(errors::RoutingError::GenericNotFoundError {
+            field: "dynamic_routing_algorithm".to_string(),
+        })?;
+
+    logger::debug!(
+        "performing dynamic_routing with open_router for profile {}",
+        profile.get_id().get_string_repr()
+    );
+
+    let connectors = dynamic_routing_algo_ref
+        .success_based_algorithm
+        .async_map(|algo| {
+            perform_success_based_routing_with_open_router(
+                state,
+                routable_connectors.clone(),
+                profile.get_id(),
+                algo,
+                payment_data,
+            )
+        })
+        .await
+        .transpose()
+        .inspect_err(|e| logger::error!(dynamic_routing_error=?e))
+        .ok()
+        .flatten()
+        .unwrap_or(routable_connectors);
+
+    Ok(connectors)
+}
+
 #[cfg(all(feature = "v1", feature = "dynamic_routing"))]
 pub async fn perform_dynamic_routing(
     state: &SessionState,
@@ -1555,6 +1607,165 @@ pub async fn perform_dynamic_routing(
     Ok(connector_list)
 }
 
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+#[instrument(skip_all)]
+pub async fn perform_success_based_routing_with_open_router(
+    state: &SessionState,
+    mut routable_connectors: Vec<api_routing::RoutableConnectorChoice>,
+    profile_id: &common_utils::id_type::ProfileId,
+    success_based_algo_ref: api_routing::SuccessBasedAlgorithm,
+    payment_attempt: oss_storage::PaymentAttempt,
+) -> RoutingResult<Vec<api_routing::RoutableConnectorChoice>> {
+    if success_based_algo_ref.enabled_feature
+        == api_routing::DynamicRoutingFeatures::DynamicConnectorSelection
+    {
+        logger::debug!(
+            "performing success_based_routing with open_router for profile {}",
+            profile_id.get_string_repr()
+        );
+
+        let open_router_req_body = OpenRouterDecideGatewayRequest::construct_sr_request(
+            payment_attempt,
+            routable_connectors
+                .iter()
+                .map(|gateway| gateway.connector)
+                .collect::<Vec<_>>(),
+            Some(or_types::RankingAlgorithm::SrBasedRouting),
+        );
+
+        let url = format!("{}/{}", &state.conf.open_router.url, "decide-gateway");
+        let mut request = request::Request::new(services::Method::Post, &url);
+        request.add_header(headers::CONTENT_TYPE, "application/json".into());
+        request.add_header(
+            headers::X_TENANT_ID,
+            state.tenant.tenant_id.get_string_repr().to_owned().into(),
+        );
+        request.set_body(request::RequestContent::Json(Box::new(
+            open_router_req_body,
+        )));
+
+        let response = services::call_connector_api(state, request, "open_router_sr_call")
+            .await
+            .change_context(errors::RoutingError::OpenRouterCallFailed {
+                algo: "success_rate".into(),
+            })?;
+
+        let sr_sorted_connectors = match response {
+            Ok(resp) => {
+                let decided_gateway: DecidedGateway = resp
+                    .response
+                    .parse_struct("DecidedGateway")
+                    .change_context(errors::RoutingError::OpenRouterError(
+                        "Failed to parse the response from open_router".into(),
+                    ))?;
+
+                if let Some(gateway_priority_map) = decided_gateway.gateway_priority_map {
+                    logger::debug!(
+                        "Open router gateway_priority_map response: {:?}",
+                        gateway_priority_map
+                    );
+                    routable_connectors.sort_by(|connector_choice_a, connector_choice_b| {
+                        let connector_choice_a_score = gateway_priority_map
+                            .get(&connector_choice_a.connector.to_string())
+                            .copied()
+                            .unwrap_or(0.0);
+                        let connector_choice_b_score = gateway_priority_map
+                            .get(&connector_choice_b.connector.to_string())
+                            .copied()
+                            .unwrap_or(0.0);
+                        connector_choice_b_score
+                            .partial_cmp(&connector_choice_a_score)
+                            .unwrap_or(std::cmp::Ordering::Equal)
+                    });
+                }
+                Ok(routable_connectors)
+            }
+            Err(err) => {
+                let err_resp: or_types::ErrorResponse = err
+                    .response
+                    .parse_struct("ErrorResponse")
+                    .change_context(errors::RoutingError::OpenRouterError(
+                        "Failed to parse the response from open_router".into(),
+                    ))?;
+                logger::error!("open_router_error_response: {:?}", err_resp);
+                Err(errors::RoutingError::OpenRouterError(
+                    "Failed to perform success based routing in open router".into(),
+                ))
+            }
+        }?;
+
+        Ok(sr_sorted_connectors)
+    } else {
+        Ok(routable_connectors)
+    }
+}
+
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+#[instrument(skip_all)]
+pub async fn update_success_rate_score_with_open_router(
+    state: &SessionState,
+    payment_connector: common_enums::RoutableConnectors,
+    profile_id: &common_utils::id_type::ProfileId,
+    payment_id: &common_utils::id_type::PaymentId,
+    payment_status: bool,
+) -> RoutingResult<()> {
+    let open_router_req_body = or_types::UpdateScorePayload {
+        merchant_id: profile_id.clone(),
+        gateway: payment_connector,
+        status: payment_status.into(),
+        payment_id: payment_id.clone(),
+    };
+
+    let url = format!("{}/{}", &state.conf.open_router.url, "update-gateway-score");
+    let mut request = request::Request::new(services::Method::Post, &url);
+    request.add_header(headers::CONTENT_TYPE, "application/json".into());
+    request.add_header(
+        headers::X_TENANT_ID,
+        state.tenant.tenant_id.get_string_repr().to_owned().into(),
+    );
+    request.set_body(request::RequestContent::Json(Box::new(
+        open_router_req_body,
+    )));
+
+    let response =
+        services::call_connector_api(state, request, "open_router_update_gateway_score_call")
+            .await
+            .change_context(errors::RoutingError::OpenRouterCallFailed {
+                algo: "success_rate".into(),
+            })?;
+
+    match response {
+        Ok(resp) => {
+            let update_score_resp = String::from_utf8(resp.response.to_vec()).change_context(
+                errors::RoutingError::OpenRouterError(
+                    "Failed to parse the response from open_router".into(),
+                ),
+            )?;
+
+            logger::debug!(
+                "Open router update_gateway_score response: {:?}",
+                update_score_resp
+            );
+
+            Ok(())
+        }
+        Err(err) => {
+            let err_resp: or_types::ErrorResponse = err
+                .response
+                .parse_struct("ErrorResponse")
+                .change_context(errors::RoutingError::OpenRouterError(
+                    "Failed to parse the response from open_router".into(),
+                ))?;
+            logger::error!("open_router_error_response: {:?}", err_resp);
+            Err(errors::RoutingError::OpenRouterError(
+                "Failed to update gateway score for success based routing in open router".into(),
+            ))
+        }
+    }?;
+
+    Ok(())
+}
+
 /// success based dynamic routing
 #[cfg(all(feature = "v1", feature = "dynamic_routing"))]
 #[instrument(skip_all)]
diff --git a/crates/router/src/core/routing/helpers.rs b/crates/router/src/core/routing/helpers.rs
index ec86102eba0..6bb0ba5878f 100644
--- a/crates/router/src/core/routing/helpers.rs
+++ b/crates/router/src/core/routing/helpers.rs
@@ -46,7 +46,10 @@ use crate::{
     utils::StringExt,
 };
 #[cfg(all(feature = "dynamic_routing", feature = "v1"))]
-use crate::{core::metrics as core_metrics, types::transformers::ForeignInto};
+use crate::{
+    core::{metrics as core_metrics, routing},
+    types::transformers::ForeignInto,
+};
 pub const SUCCESS_BASED_DYNAMIC_ROUTING_ALGORITHM: &str =
     "Success rate based dynamic routing algorithm";
 pub const ELIMINATION_BASED_DYNAMIC_ROUTING_ALGORITHM: &str =
@@ -688,6 +691,28 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
                 },
             )?;
 
+            let payment_status_attribute =
+                get_desired_payment_status_for_dynamic_routing_metrics(payment_attempt.status);
+
+            let should_route_to_open_router = state.conf.open_router.enabled;
+
+            if should_route_to_open_router {
+                routing::payments_routing::update_success_rate_score_with_open_router(
+                    state,
+                    common_enums::RoutableConnectors::from_str(payment_connector.as_str())
+                        .change_context(errors::ApiErrorResponse::InternalServerError)
+                        .attach_printable("unable to infer routable_connector from connector")?,
+                    profile_id,
+                    &payment_attempt.payment_id,
+                    payment_status_attribute == common_enums::AttemptStatus::Charged,
+                )
+                .await
+                .change_context(errors::ApiErrorResponse::InternalServerError)
+                .attach_printable("failed to update gateway score in open router service")?;
+
+                return Ok(());
+            }
+
             let success_based_routing_configs = fetch_dynamic_routing_configs::<
                 routing_types::SuccessBasedRoutingConfig,
             >(
@@ -732,9 +757,6 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
                     "unable to calculate/fetch success rate from dynamic routing service",
                 )?;
 
-            let payment_status_attribute =
-                get_desired_payment_status_for_dynamic_routing_metrics(payment_attempt.status);
-
             let first_merchant_success_based_connector = &success_based_connectors
                 .entity_scores_with_labels
                 .first()
@@ -932,6 +954,7 @@ pub async fn push_metrics_with_update_window_for_success_based_routing(
                 .attach_printable(
                     "unable to update success based routing window in dynamic routing service",
                 )?;
+
             Ok(())
         } else {
             Ok(())
diff --git a/crates/router/src/core/routing/transformers.rs b/crates/router/src/core/routing/transformers.rs
index 652422086b7..d73e0d28671 100644
--- a/crates/router/src/core/routing/transformers.rs
+++ b/crates/router/src/core/routing/transformers.rs
@@ -1,12 +1,18 @@
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use api_models::open_router::{OpenRouterDecideGatewayRequest, PaymentInfo, RankingAlgorithm};
 use api_models::routing::{
     MerchantRoutingAlgorithm, RoutingAlgorithm as Algorithm, RoutingAlgorithmKind,
     RoutingDictionaryRecord,
 };
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use common_enums::RoutableConnectors;
 use common_utils::ext_traits::ValueExt;
 use diesel_models::{
     enums as storage_enums,
     routing_algorithm::{RoutingAlgorithm, RoutingProfileMetadata},
 };
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+use hyperswitch_domain_models::payments::payment_attempt::PaymentAttempt;
 
 use crate::{
     core::{errors, routing},
@@ -98,3 +104,39 @@ impl From<&routing::TransactionData<'_>> for storage_enums::TransactionType {
         }
     }
 }
+
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+pub trait OpenRouterDecideGatewayRequestExt {
+    fn construct_sr_request(
+        attempt: PaymentAttempt,
+        eligible_gateway_list: Vec<RoutableConnectors>,
+        ranking_algorithm: Option<RankingAlgorithm>,
+    ) -> Self
+    where
+        Self: Sized;
+}
+
+#[cfg(all(feature = "v1", feature = "dynamic_routing"))]
+impl OpenRouterDecideGatewayRequestExt for OpenRouterDecideGatewayRequest {
+    fn construct_sr_request(
+        attempt: PaymentAttempt,
+        eligible_gateway_list: Vec<RoutableConnectors>,
+        ranking_algorithm: Option<RankingAlgorithm>,
+    ) -> Self {
+        Self {
+            payment_info: PaymentInfo {
+                payment_id: attempt.payment_id,
+                amount: attempt.net_amount.get_order_amount(),
+                currency: attempt.currency.unwrap_or(storage_enums::Currency::USD),
+                payment_type: "ORDER_PAYMENT".to_string(),
+                // payment_method_type: attempt.payment_method_type.clone().unwrap(),
+                payment_method_type: "UPI".into(), // TODO: once open-router makes this field string, we can send from attempt
+                payment_method: attempt.payment_method.unwrap_or_default(),
+            },
+            merchant_id: attempt.profile_id,
+            eligible_gateway_list: Some(eligible_gateway_list),
+            ranking_algorithm,
+            elimination_enabled: None,
+        }
+    }
+}