diff --git a/crates/router/src/connector/gpayments.rs b/crates/router/src/connector/gpayments.rs
index 4d72788a2d2a..e628779cd97d 100644
--- a/crates/router/src/connector/gpayments.rs
+++ b/crates/router/src/connector/gpayments.rs
@@ -9,6 +9,7 @@ use transformers as gpayments;
 
 use crate::{
     configs::settings,
+    connector::{gpayments::gpayments_types::GpaymentsConnectorMetaData, utils::to_connector_meta},
     core::errors::{self, CustomResult},
     events::connector_api_logs::ConnectorEvent,
     headers, services,
@@ -214,8 +215,103 @@ impl
         types::authentication::AuthenticationResponseData,
     > for Gpayments
 {
-}
+    fn get_headers(
+        &self,
+        req: &types::authentication::ConnectorAuthenticationRouterData,
+        connectors: &settings::Connectors,
+    ) -> CustomResult<Vec<(String, request::Maskable<String>)>, errors::ConnectorError> {
+        self.build_headers(req, connectors)
+    }
+
+    fn get_content_type(&self) -> &'static str {
+        self.common_get_content_type()
+    }
+
+    fn get_url(
+        &self,
+        req: &types::authentication::ConnectorAuthenticationRouterData,
+        _connectors: &settings::Connectors,
+    ) -> CustomResult<String, errors::ConnectorError> {
+        let connector_metadata: GpaymentsConnectorMetaData = to_connector_meta(
+            req.request
+                .pre_authentication_data
+                .connector_metadata
+                .clone(),
+        )?;
+        Ok(connector_metadata.authentication_url)
+    }
+
+    fn get_request_body(
+        &self,
+        req: &types::authentication::ConnectorAuthenticationRouterData,
+        _connectors: &settings::Connectors,
+    ) -> CustomResult<RequestContent, errors::ConnectorError> {
+        let connector_router_data = gpayments::GpaymentsRouterData::try_from((0, req))?;
+        let req_obj =
+            gpayments_types::GpaymentsAuthenticationRequest::try_from(&connector_router_data)?;
+        Ok(RequestContent::Json(Box::new(req_obj)))
+    }
+    fn build_request(
+        &self,
+        req: &types::authentication::ConnectorAuthenticationRouterData,
+        connectors: &settings::Connectors,
+    ) -> CustomResult<Option<services::Request>, errors::ConnectorError> {
+        let gpayments_auth_type = gpayments::GpaymentsAuthType::try_from(&req.connector_auth_type)?;
+        Ok(Some(
+            services::RequestBuilder::new()
+                .method(services::Method::Post)
+                .url(
+                    &types::authentication::ConnectorAuthenticationType::get_url(
+                        self, req, connectors,
+                    )?,
+                )
+                .attach_default_headers()
+                .headers(
+                    types::authentication::ConnectorAuthenticationType::get_headers(
+                        self, req, connectors,
+                    )?,
+                )
+                .set_body(
+                    types::authentication::ConnectorAuthenticationType::get_request_body(
+                        self, req, connectors,
+                    )?,
+                )
+                .add_certificate(Some(gpayments_auth_type.certificate))
+                .add_certificate_key(Some(gpayments_auth_type.private_key))
+                .build(),
+        ))
+    }
+
+    fn handle_response(
+        &self,
+        data: &types::authentication::ConnectorAuthenticationRouterData,
+        event_builder: Option<&mut ConnectorEvent>,
+        res: Response,
+    ) -> CustomResult<
+        types::authentication::ConnectorAuthenticationRouterData,
+        errors::ConnectorError,
+    > {
+        let response: gpayments_types::GpaymentsAuthenticationSuccessResponse = res
+            .response
+            .parse_struct("gpayments GpaymentsAuthenticationResponse")
+            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
+        event_builder.map(|i| i.set_response_body(&response));
+        router_env::logger::info!(connector_response=?response);
+        types::RouterData::try_from(types::ResponseRouterData {
+            response,
+            data: data.clone(),
+            http_code: res.status_code,
+        })
+    }
 
+    fn get_error_response(
+        &self,
+        res: Response,
+        event_builder: Option<&mut ConnectorEvent>,
+    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
+        self.build_error_response(res, event_builder)
+    }
+}
 impl
     ConnectorIntegration<
         api::PostAuthentication,
@@ -223,6 +319,92 @@ impl
         types::authentication::AuthenticationResponseData,
     > for Gpayments
 {
+    fn get_headers(
+        &self,
+        req: &types::authentication::ConnectorPostAuthenticationRouterData,
+        connectors: &settings::Connectors,
+    ) -> CustomResult<Vec<(String, request::Maskable<String>)>, errors::ConnectorError> {
+        self.build_headers(req, connectors)
+    }
+
+    fn get_content_type(&self) -> &'static str {
+        self.common_get_content_type()
+    }
+
+    fn get_url(
+        &self,
+        req: &types::authentication::ConnectorPostAuthenticationRouterData,
+        connectors: &settings::Connectors,
+    ) -> CustomResult<String, errors::ConnectorError> {
+        let base_url = build_endpoint(self.base_url(connectors), &req.connector_meta_data)?;
+        Ok(format!(
+            "{}/api/v2/auth/brw/result?threeDSServerTransID={}",
+            base_url, req.request.threeds_server_transaction_id,
+        ))
+    }
+
+    fn build_request(
+        &self,
+        req: &types::authentication::ConnectorPostAuthenticationRouterData,
+        connectors: &settings::Connectors,
+    ) -> CustomResult<Option<services::Request>, errors::ConnectorError> {
+        let gpayments_auth_type = gpayments::GpaymentsAuthType::try_from(&req.connector_auth_type)?;
+        Ok(Some(
+            services::RequestBuilder::new()
+                .method(services::Method::Get)
+                .url(
+                    &types::authentication::ConnectorPostAuthenticationType::get_url(
+                        self, req, connectors,
+                    )?,
+                )
+                .attach_default_headers()
+                .headers(
+                    types::authentication::ConnectorPostAuthenticationType::get_headers(
+                        self, req, connectors,
+                    )?,
+                )
+                .add_certificate(Some(gpayments_auth_type.certificate))
+                .add_certificate_key(Some(gpayments_auth_type.private_key))
+                .build(),
+        ))
+    }
+
+    fn handle_response(
+        &self,
+        data: &types::authentication::ConnectorPostAuthenticationRouterData,
+        event_builder: Option<&mut ConnectorEvent>,
+        res: Response,
+    ) -> CustomResult<
+        types::authentication::ConnectorPostAuthenticationRouterData,
+        errors::ConnectorError,
+    > {
+        let response: gpayments_types::GpaymentsPostAuthenticationResponse = res
+            .response
+            .parse_struct("gpayments PaymentsSyncResponse")
+            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
+        event_builder.map(|i| i.set_response_body(&response));
+        router_env::logger::info!(connector_response=?response);
+        Ok(
+            types::authentication::ConnectorPostAuthenticationRouterData {
+                response: Ok(
+                    types::authentication::AuthenticationResponseData::PostAuthNResponse {
+                        trans_status: response.trans_status.into(),
+                        authentication_value: response.authentication_value,
+                        eci: response.eci,
+                    },
+                ),
+                ..data.clone()
+            },
+        )
+    }
+
+    fn get_error_response(
+        &self,
+        res: Response,
+        event_builder: Option<&mut ConnectorEvent>,
+    ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
+        self.build_error_response(res, event_builder)
+    }
 }
 
 impl
diff --git a/crates/router/src/connector/gpayments/gpayments_types.rs b/crates/router/src/connector/gpayments/gpayments_types.rs
index c95e778bcbe5..cb436fe8830f 100644
--- a/crates/router/src/connector/gpayments/gpayments_types.rs
+++ b/crates/router/src/connector/gpayments/gpayments_types.rs
@@ -1,13 +1,13 @@
+use api_models::payments::ThreeDsCompletionIndicator;
 use cards::CardNumber;
 use common_utils::types;
-use masking::{Deserialize, Serialize};
+use masking::{Deserialize, Secret, Serialize};
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct GpaymentsConnectorMetaData {
     pub authentication_url: String,
     pub three_ds_requestor_trans_id: Option<String>,
 }
-
 #[derive(Serialize, Deserialize, Debug, Clone)]
 #[serde(rename_all = "camelCase")]
 pub struct GpaymentsPreAuthVersionCallRequest {
@@ -38,6 +38,9 @@ pub struct TDS2ApiError {
     pub error_description: String,
     pub error_detail: Option<String>,
     pub error_message_type: Option<String>,
+    /// Always returns 'Error' to indicate that this message is an error.
+    ///
+    /// Example: "Error"
     pub message_type: String,
     pub message_version: Option<String>,
     #[serde(rename = "sdkTransID")]
@@ -122,3 +125,112 @@ pub struct GpaymentsPreAuthenticationResponse {
     #[serde(rename = "threeDSServerTransID")]
     pub three_ds_server_trans_id: String,
 }
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct GpaymentsAuthenticationRequest {
+    pub acct_number: CardNumber,
+    pub authentication_ind: String,
+    pub browser_info_collected: BrowserInfoCollected,
+    pub card_expiry_date: String,
+    #[serde(rename = "notificationURL")]
+    pub notification_url: String,
+    pub merchant_id: String,
+    #[serde(rename = "threeDSCompInd")]
+    pub three_ds_comp_ind: ThreeDsCompletionIndicator,
+    pub message_category: String,
+    pub purchase_amount: String,
+    pub purchase_date: String,
+    #[serde(rename = "threeDSServerTransID")]
+    pub three_ds_server_trans_id: String,
+}
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct BrowserInfoCollected {
+    pub browser_accept_header: Option<String>,
+    pub browser_color_depth: Option<String>,
+    #[serde(rename = "browserIP")]
+    pub browser_ip: Option<Secret<String, common_utils::pii::IpAddress>>,
+    pub browser_javascript_enabled: Option<bool>,
+    pub browser_java_enabled: Option<bool>,
+    pub browser_language: Option<String>,
+    pub browser_screen_height: Option<String>,
+    pub browser_screen_width: Option<String>,
+    #[serde(rename = "browserTZ")]
+    pub browser_tz: Option<String>,
+    pub browser_user_agent: Option<String>,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+pub enum AuthenticationInd {
+    #[serde(rename = "01")]
+    PaymentTransaction,
+    #[serde(rename = "02")]
+    RecurringTransaction,
+    #[serde(rename = "03")]
+    InstalmentTransaction,
+    #[serde(rename = "04")]
+    AddCard,
+    #[serde(rename = "05")]
+    MaintainCard,
+    #[serde(rename = "06")]
+    CardholderVerification,
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone)]
+#[serde(rename_all = "camelCase")]
+pub struct GpaymentsAuthenticationSuccessResponse {
+    #[serde(rename = "dsReferenceNumber")]
+    pub ds_reference_number: String,
+    #[serde(rename = "dsTransID")]
+    pub ds_trans_id: String,
+    #[serde(rename = "threeDSServerTransID")]
+    pub three_ds_server_trans_id: String,
+    #[serde(rename = "messageVersion")]
+    pub message_version: String,
+    #[serde(rename = "transStatus")]
+    pub trans_status: AuthStatus,
+    #[serde(rename = "acsTransID")]
+    pub acs_trans_id: String,
+    #[serde(rename = "challengeUrl")]
+    pub acs_url: Option<url::Url>,
+    #[serde(rename = "acsReferenceNumber")]
+    pub acs_reference_number: String,
+    pub authentication_value: Option<String>,
+}
+
+#[derive(Deserialize, Debug, Clone, Serialize, PartialEq)]
+pub enum AuthStatus {
+    /// Authentication/ Account Verification Successful
+    Y,
+    /// Not Authenticated /Account Not Verified; Transaction denied
+    N,
+    /// Authentication/ Account Verification Could Not Be Performed; Technical or other problem, as indicated in ARes or RReq
+    U,
+    /// Attempts Processing Performed; Not Authenticated/Verified , but a proof of attempted authentication/verification is provided
+    A,
+    /// Authentication/ Account Verification Rejected; Issuer is rejecting authentication/verification and request that authorisation not be attempted.
+    R,
+    /// Challenge required
+    C,
+}
+
+impl From<AuthStatus> for common_enums::TransactionStatus {
+    fn from(value: AuthStatus) -> Self {
+        match value {
+            AuthStatus::Y => Self::Success,
+            AuthStatus::N => Self::Failure,
+            AuthStatus::U => Self::VerificationNotPerformed,
+            AuthStatus::A => Self::NotVerified,
+            AuthStatus::R => Self::Rejected,
+            AuthStatus::C => Self::ChallengeRequired,
+        }
+    }
+}
+#[derive(Debug, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GpaymentsPostAuthenticationResponse {
+    pub authentication_value: Option<String>,
+    pub trans_status: AuthStatus,
+    pub eci: Option<String>,
+}
diff --git a/crates/router/src/connector/gpayments/transformers.rs b/crates/router/src/connector/gpayments/transformers.rs
index ee98d26e388f..c6bce775e8f1 100644
--- a/crates/router/src/connector/gpayments/transformers.rs
+++ b/crates/router/src/connector/gpayments/transformers.rs
@@ -1,16 +1,25 @@
+use api_models::payments::DeviceChannel;
+use base64::Engine;
+use common_utils::date_time;
 use error_stack::ResultExt;
-use masking::Secret;
-use serde::{Deserialize, Serialize};
+use masking::{ExposeInterface, Secret};
+use serde::Deserialize;
+use serde_json::to_string;
 
 use super::gpayments_types;
 use crate::{
-    connector::utils,
-    consts,
+    connector::{
+        gpayments::gpayments_types::{
+            AuthStatus, BrowserInfoCollected, GpaymentsAuthenticationSuccessResponse,
+        },
+        utils,
+        utils::{get_card_details, CardData},
+    },
+    consts::BASE64_ENGINE,
     core::errors,
-    types::{self, api},
+    types::{self, api, api::MessageCategory, authentication::ChallengeParams},
 };
 
-//TODO: Fill the struct with respective fields
 pub struct GpaymentsRouterData<T> {
     pub amount: i64, // The type of amount that a connector accepts, for example, String, i64, f64, etc.
     pub router_data: T,
@@ -26,7 +35,6 @@ impl<T> TryFrom<(i64, T)> for GpaymentsRouterData<T> {
     }
 }
 
-//TODO: Fill the struct with respective fields
 // Auth Struct
 pub struct GpaymentsAuthType {
     /// base64 encoded certificate
@@ -68,15 +76,6 @@ impl TryFrom<&GpaymentsRouterData<&types::authentication::PreAuthNVersionCallRou
     }
 }
 
-//TODO: Fill the struct with respective fields
-#[derive(Default, Debug, Serialize, Deserialize, PartialEq)]
-pub struct GpaymentsErrorResponse {
-    pub status_code: u16,
-    pub code: String,
-    pub message: String,
-    pub reason: Option<String>,
-}
-
 #[derive(Deserialize, PartialEq)]
 pub struct GpaymentsMetaData {
     pub endpoint_prefix: String,
@@ -146,11 +145,9 @@ impl TryFrom<&GpaymentsRouterData<&types::authentication::PreAuthNRouterData>>
             acct_number: router_data.request.card_holder_account_number.clone(),
             card_scheme: None,
             challenge_window_size: Some(gpayments_types::ChallengeWindowSize::FullScreen),
-            // This is a required field but we don't listen to event callbacks
             event_callback_url: "https://webhook.site/55e3db24-7c4e-4432-9941-d806f68d210b"
                 .to_string(),
             merchant_id: metadata.merchant_id,
-            // Since this feature is not in our favour, hard coded it to true
             skip_auto_browser_info_collect: Some(true),
             // should auto generate this id.
             three_ds_requestor_trans_id: uuid::Uuid::new_v4().hyphenated().to_string(),
@@ -158,6 +155,151 @@ impl TryFrom<&GpaymentsRouterData<&types::authentication::PreAuthNRouterData>>
     }
 }
 
+impl TryFrom<&GpaymentsRouterData<&types::authentication::ConnectorAuthenticationRouterData>>
+    for gpayments_types::GpaymentsAuthenticationRequest
+{
+    type Error = error_stack::Report<errors::ConnectorError>;
+
+    fn try_from(
+        item: &GpaymentsRouterData<&types::authentication::ConnectorAuthenticationRouterData>,
+    ) -> Result<Self, Self::Error> {
+        let request = &item.router_data.request;
+        let browser_details = match request.browser_details.clone() {
+            Some(details) => Ok::<Option<types::BrowserInformation>, Self::Error>(Some(details)),
+            None => {
+                if request.device_channel == DeviceChannel::Browser {
+                    Err(errors::ConnectorError::MissingRequiredField {
+                        field_name: "browser_info",
+                    })?
+                } else {
+                    Ok(None)
+                }
+            }
+        }?;
+        let card_details = get_card_details(request.payment_method_data.clone(), "gpayments")?;
+
+        let metadata = GpaymentsMetaData::try_from(&item.router_data.connector_meta_data)?;
+
+        Ok(Self {
+            acct_number: card_details.card_number.clone(),
+            authentication_ind: "01".into(),
+            card_expiry_date: card_details.get_expiry_date_as_yymm()?.expose(),
+            merchant_id: metadata.merchant_id,
+            message_category: match item.router_data.request.message_category.clone() {
+                MessageCategory::Payment => "01".into(),
+                MessageCategory::NonPayment => "02".into(),
+            },
+            notification_url: request
+                .return_url
+                .clone()
+                .ok_or(errors::ConnectorError::RequestEncodingFailed)
+                .attach_printable("missing return_url")?,
+            three_ds_comp_ind: request.threeds_method_comp_ind.clone(),
+            purchase_amount: item.amount.to_string(),
+            purchase_date: date_time::DateTime::<date_time::YYYYMMDDHHmmss>::from(date_time::now())
+                .to_string(),
+            three_ds_server_trans_id: request
+                .pre_authentication_data
+                .threeds_server_transaction_id
+                .clone(),
+            browser_info_collected: BrowserInfoCollected {
+                browser_javascript_enabled: browser_details
+                    .as_ref()
+                    .and_then(|details| details.java_script_enabled),
+                browser_accept_header: browser_details
+                    .as_ref()
+                    .and_then(|details| details.accept_header.clone()),
+                browser_ip: browser_details
+                    .clone()
+                    .and_then(|details| details.ip_address.map(|ip| Secret::new(ip.to_string()))),
+                browser_java_enabled: browser_details
+                    .as_ref()
+                    .and_then(|details| details.java_enabled),
+                browser_language: browser_details
+                    .as_ref()
+                    .and_then(|details| details.language.clone()),
+                browser_color_depth: browser_details
+                    .as_ref()
+                    .and_then(|details| details.color_depth.map(|a| a.to_string())),
+                browser_screen_height: browser_details
+                    .as_ref()
+                    .and_then(|details| details.screen_height.map(|a| a.to_string())),
+                browser_screen_width: browser_details
+                    .as_ref()
+                    .and_then(|details| details.screen_width.map(|a| a.to_string())),
+                browser_tz: browser_details
+                    .as_ref()
+                    .and_then(|details| details.time_zone.map(|a| a.to_string())),
+                browser_user_agent: browser_details
+                    .as_ref()
+                    .and_then(|details| details.user_agent.clone().map(|a| a.to_string())),
+            },
+        })
+    }
+}
+impl
+    TryFrom<
+        types::ResponseRouterData<
+            api::Authentication,
+            GpaymentsAuthenticationSuccessResponse,
+            types::authentication::ConnectorAuthenticationRequestData,
+            types::authentication::AuthenticationResponseData,
+        >,
+    > for types::authentication::ConnectorAuthenticationRouterData
+{
+    type Error = error_stack::Report<errors::ConnectorError>;
+    fn try_from(
+        item: types::ResponseRouterData<
+            api::Authentication,
+            GpaymentsAuthenticationSuccessResponse,
+            types::authentication::ConnectorAuthenticationRequestData,
+            types::authentication::AuthenticationResponseData,
+        >,
+    ) -> Result<Self, Self::Error> {
+        let response_auth = item.response;
+        let creq = serde_json::json!({
+            "threeDSServerTransID": response_auth.three_ds_server_trans_id,
+            "acsTransID": response_auth.acs_trans_id,
+            "messageVersion": response_auth.message_version,
+            "messageType": "CReq",
+            "challengeWindowSize": "01",
+        });
+        let creq_str = to_string(&creq)
+            .change_context(errors::ConnectorError::ResponseDeserializationFailed)
+            .attach_printable("error while constructing creq_str")?;
+        let creq_base64 = Engine::encode(&BASE64_ENGINE, creq_str)
+            .trim_end_matches('=')
+            .to_owned();
+        let response: Result<
+            types::authentication::AuthenticationResponseData,
+            types::ErrorResponse,
+        > = Ok(
+            types::authentication::AuthenticationResponseData::AuthNResponse {
+                trans_status: response_auth.trans_status.clone().into(),
+                authn_flow_type: if response_auth.trans_status == AuthStatus::C {
+                    types::authentication::AuthNFlowType::Challenge(Box::new(ChallengeParams {
+                        acs_url: response_auth.acs_url,
+                        challenge_request: Some(creq_base64),
+                        acs_reference_number: Some(response_auth.acs_reference_number.clone()),
+                        acs_trans_id: Some(response_auth.acs_trans_id.clone()),
+                        three_dsserver_trans_id: Some(response_auth.three_ds_server_trans_id),
+                        acs_signed_content: None,
+                    }))
+                } else {
+                    types::authentication::AuthNFlowType::Frictionless
+                },
+                authentication_value: response_auth.authentication_value,
+                ds_trans_id: Some(response_auth.ds_trans_id),
+                connector_metadata: None,
+            },
+        );
+        Ok(Self {
+            response,
+            ..item.data.clone()
+        })
+    }
+}
+
 impl
     TryFrom<
         types::ResponseRouterData<
@@ -186,11 +328,11 @@ impl
                     "threeDSServerTransID": threeds_method_response.three_ds_server_trans_id,
                     "threeDSMethodNotificationURL": "https://webhook.site/bd06863d-82c2-42ea-b35b-5ffd5ecece71"
                 });
-                serde_json::to_string(&three_ds_method_data_json)
+                to_string(&three_ds_method_data_json)
                     .change_context(errors::ConnectorError::ResponseDeserializationFailed)
                     .attach_printable("error while constructing three_ds_method_data_str")
                     .map(|three_ds_method_data_string| {
-                        base64::Engine::encode(&consts::BASE64_ENGINE, three_ds_method_data_string)
+                        Engine::encode(&BASE64_ENGINE, three_ds_method_data_string)
                     })
             })
             .transpose()?;