Issue:
Bug: [FEATURE] : [Nuvei] mask pii information in connector request and response



### Feature Description

Mask pii information passed and received in the connector request and response

### Possible Implementation

Refactor all sensitive response and request fields secret

### Have you spent some time checking if this feature request has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [x] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Mask pii information passed and received in the connector request and response for Nuvie.

## 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)?
-->
1. Create a card payment 
```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key:{{api_key}}' \
--data-raw '{
    "amount": 20000,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "StripeCustomer",
    "email": "abcdef123@gmail.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+65",
    "description": "Its my first payment request",
    "authentication_type": "three_ds",
    "return_url": "https://google.com",
    
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "John",
            "last_name": "Doe"
        }
    },
    "browser_info": {
        "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36",
        "accept_header": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
        "language": "nl-NL",
        "color_depth": 24,
        "screen_height": 723,
        "screen_width": 1536,
        "time_zone": 0,
        "java_enabled": true,
        "java_script_enabled": true,
        "ip_address": "127.0.0.1"
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "John",
            "last_name": "Doe"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    },
    "payment_method": "card",
    "payment_method_data": {
        "card": {
            "card_number": "4000027891380961",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_holder_name": "Joseph Doe",
            "card_cvc": "123"
        }
    }
}'
```

2. Check if `subscription_data.identifier`  in the `masked_response` is masked

```
curl --location '{{base_url}}/analytics/v1/connector_event_logs?type=Payment&payment_id={{payment_id}}' \
--header 'sec-ch-ua: "Not A(Brand";v="99", "Google Chrome";v="121", "Chromium";v="121"' \
--header 'sec-ch-ua-mobile: ?0' \
--header 'authorization: Bearer JWT_token' \
--header 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36' \
--header 'Content-Type: application/json' \
--header 'Referer: https://integ.hyperswitch.io/' \
--header 'api-key: {{api-key}}' \
--header 'sec-ch-ua-platform: "macOS"'
```

Response
```
masked_response\":\"{\\\"orderId\\\":\\\"425682678\\\",\\\"userTokenId\\\":null,\\\"paymentOption\\\":{\\\"card\\\":{\\\"threeD\\\":{\\\"version\\\":\\\"\\\",\\\"cReq\\\":\\\"*** alloc::string::String ***\\\"},\\\"ccCardNumber\\\":\\\"*** alloc::string::String ***\\\",\\\"bin\\\":\\\"*** alloc::string::String ***\\\",\\\"last4Digits\\\":\\\"*** alloc::string::String ***\\\",\\\"ccExpMonth\\\":\\\"*** alloc::string::String ***\\\",\\\"ccExpYear\\\":\\\"*** alloc::string::String ***\\\",\\\"acquirerId\\\":\\\"*** alloc::string::String ***\\\",\\\"cvv2Reply\\\":\\\"\\\",\\\"avsCode\\\":\\\"\\\",\\\"cardType\\\":\\\"Credit\\\",\\\"cardBrand\\\":\\\"VISA\\\",\\\"issuerBankName\\\":\\\"River Valley Credit Union\\\",\\\"issuerCountry\\\":\\\"GB\\\",\\\"isPrepaid\\\":\\\"false\\\"},\\\"userPaymentOptionId\\\":\\\"\\\"},\\\"transactionStatus\\\":\\\"ERROR\\\",\\\"gwErrorCode\\\":-1,\\\"gwErrorReason\\\":\\\"UNEXPECTED SYSTEM ERROR - PLEASE RETRY LATER\\\",\\\"gwExtendedErrorCode\\\":-1,\\\"issuerDeclineCode\\\":\\\"\\\",\\\"issuerDeclineReason\\\":\\\"\\\",\\\"transactionType\\\":\\\"Auth3D\\\",\\\"transactionId\\\":\\\"711000000033006423\\\",\\\"externalTransactionId\\\":\\\"\\\",\\\"authCode\\\":\\\"\\\",\\\"customData\\\":\\\"\\\",\\\"fraudDetails\\\":null,\\\"externalSchemeTransactionId\\\":\\\"*** alloc::string::String ***\\\",\\\"sessionToken\\\":\\\"*** alloc::string::String ***\\\",\\\"clientUniqueId\\\":\\\"\\\",\\\"internalRequestId\\\":944545618,\\\"status\\\":\\\"SUCCESS\\\",\\\"errCode\\\":0,\\\"reason\\\":\\\"\\\",\\\"merchantId\\\":\\\"*** alloc::string::String ***\\\",\\\"merchantSiteId\\\":\\\"*** alloc::string::String ***\\\",\\\"version\\\":\\\"1.0\\\",\\\"clientRequestId\\\":\\\"pay_oVLDU95Hwm0D4tjm6CH6_1\\\"}
```


## 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
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

1. Create a card payment 
```
curl --location 'http://localhost:8080/payments' \
--header 'Content-Type: application/json' \
--header 'Accept: application/json' \
--header 'api-key:{{api_key}}' \
--data-raw '{
    "amount": 20000,
    "currency": "USD",
    "confirm": true,
    "capture_method": "automatic",
    "capture_on": "2022-09-10T10:11:12Z",
    "customer_id": "StripeCustomer",
    "email": "abcdef123@gmail.com",
    "name": "John Doe",
    "phone": "999999999",
    "phone_country_code": "+65",
    "description": "Its my first payment request",
    "authentication_type": "three_ds",
    "return_url": "https://google.com",
    
    "billing": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "John",
            "last_name": "Doe"
        }
    },
    "browser_info": {
        "user_agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36",
        "accept_header": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",
        "language": "nl-NL",
        "color_depth": 24,
        "screen_height": 723,
        "screen_width": 1536,
        "time_zone": 0,
        "java_enabled": true,
        "java_script_enabled": true,
        "ip_address": "127.0.0.1"
    },
    "shipping": {
        "address": {
            "line1": "1467",
            "line2": "Harrison Street",
            "line3": "Harrison Street",
            "city": "San Fransico",
            "state": "California",
            "zip": "94122",
            "country": "US",
            "first_name": "John",
            "last_name": "Doe"
        }
    },
    "statement_descriptor_name": "joseph",
    "statement_descriptor_suffix": "JS",
    "metadata": {
        "udf1": "value1",
        "new_customer": "true",
        "login_date": "2019-09-10T10:11:12Z"
    },
    "payment_method": "card",
    "payment_method_data": {
        "card": {
            "card_number": "4000027891380961",
            "card_exp_month": "10",
            "card_exp_year": "25",
            "card_holder_name": "Joseph Doe",
            "card_cvc": "123"
        }
    }
}'
```

2. Check if `subscription_data.identifier`  in the `masked_response` is masked

```
curl --location '{{base_url}}/analytics/v1/connector_event_logs?type=Payment&payment_id={{payment_id}}' \
--header 'sec-ch-ua: "Not A(Brand";v="99", "Google Chrome";v="121", "Chromium";v="121"' \
--header 'sec-ch-ua-mobile: ?0' \
--header 'authorization: Bearer JWT_token' \
--header 'User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36' \
--header 'Content-Type: application/json' \
--header 'Referer: https://integ.hyperswitch.io/' \
--header 'api-key: {{api-key}}' \
--header 'sec-ch-ua-platform: "macOS"'
```

Response
```
masked_response\":\"{\\\"orderId\\\":\\\"425682678\\\",\\\"userTokenId\\\":null,\\\"paymentOption\\\":{\\\"card\\\":{\\\"threeD\\\":{\\\"version\\\":\\\"\\\",\\\"cReq\\\":\\\"*** alloc::string::String ***\\\"},\\\"ccCardNumber\\\":\\\"*** alloc::string::String ***\\\",\\\"bin\\\":\\\"*** alloc::string::String ***\\\",\\\"last4Digits\\\":\\\"*** alloc::string::String ***\\\",\\\"ccExpMonth\\\":\\\"*** alloc::string::String ***\\\",\\\"ccExpYear\\\":\\\"*** alloc::string::String ***\\\",\\\"acquirerId\\\":\\\"*** alloc::string::String ***\\\",\\\"cvv2Reply\\\":\\\"\\\",\\\"avsCode\\\":\\\"\\\",\\\"cardType\\\":\\\"Credit\\\",\\\"cardBrand\\\":\\\"VISA\\\",\\\"issuerBankName\\\":\\\"River Valley Credit Union\\\",\\\"issuerCountry\\\":\\\"GB\\\",\\\"isPrepaid\\\":\\\"false\\\"},\\\"userPaymentOptionId\\\":\\\"\\\"},\\\"transactionStatus\\\":\\\"ERROR\\\",\\\"gwErrorCode\\\":-1,\\\"gwErrorReason\\\":\\\"UNEXPECTED SYSTEM ERROR - PLEASE RETRY LATER\\\",\\\"gwExtendedErrorCode\\\":-1,\\\"issuerDeclineCode\\\":\\\"\\\",\\\"issuerDeclineReason\\\":\\\"\\\",\\\"transactionType\\\":\\\"Auth3D\\\",\\\"transactionId\\\":\\\"711000000033006423\\\",\\\"externalTransactionId\\\":\\\"\\\",\\\"authCode\\\":\\\"\\\",\\\"customData\\\":\\\"\\\",\\\"fraudDetails\\\":null,\\\"externalSchemeTransactionId\\\":\\\"*** alloc::string::String ***\\\",\\\"sessionToken\\\":\\\"*** alloc::string::String ***\\\",\\\"clientUniqueId\\\":\\\"\\\",\\\"internalRequestId\\\":944545618,\\\"status\\\":\\\"SUCCESS\\\",\\\"errCode\\\":0,\\\"reason\\\":\\\"\\\",\\\"merchantId\\\":\\\"*** alloc::string::String ***\\\",\\\"merchantSiteId\\\":\\\"*** alloc::string::String ***\\\",\\\"version\\\":\\\"1.0\\\",\\\"clientRequestId\\\":\\\"pay_oVLDU95Hwm0D4tjm6CH6_1\\\"}
```

Patch:
diff --git a/crates/router/src/connector/nuvei.rs b/crates/router/src/connector/nuvei.rs
index 8d3be455d49..0e9a9634402 100644
--- a/crates/router/src/connector/nuvei.rs
+++ b/crates/router/src/connector/nuvei.rs
@@ -9,6 +9,7 @@ use ::common_utils::{
     request::RequestContent,
 };
 use error_stack::{IntoReport, ResultExt};
+use masking::ExposeInterface;
 use transformers as nuvei;
 
 use super::utils::{self, RouterData};
@@ -1010,7 +1011,7 @@ impl services::ConnectorRedirectResponse for Nuvei {
                     let redirect_response: nuvei::NuveiRedirectionResponse =
                         payload.parse_value("NuveiRedirectionResponse").switch()?;
                     let acs_response: nuvei::NuveiACSResponse =
-                        utils::base64_decode(redirect_response.cres)?
+                        utils::base64_decode(redirect_response.cres.expose())?
                             .as_slice()
                             .parse_struct("NuveiACSResponse")
                             .switch()?;
diff --git a/crates/router/src/connector/nuvei/transformers.rs b/crates/router/src/connector/nuvei/transformers.rs
index 1312eadadf7..6c99536109b 100644
--- a/crates/router/src/connector/nuvei/transformers.rs
+++ b/crates/router/src/connector/nuvei/transformers.rs
@@ -3,12 +3,12 @@ use common_utils::{
     crypto::{self, GenerateDigest},
     date_time,
     ext_traits::Encode,
-    fp_utils, pii,
-    pii::Email,
+    fp_utils,
+    pii::{Email, IpAddress},
 };
 use data_models::mandates::MandateDataType;
 use error_stack::{IntoReport, ResultExt};
-use masking::{PeekInterface, Secret};
+use masking::{ExposeInterface, PeekInterface, Secret};
 use reqwest::Url;
 use serde::{Deserialize, Serialize};
 
@@ -26,7 +26,7 @@ use crate::{
 
 #[derive(Debug, Serialize, Default, Deserialize)]
 pub struct NuveiMeta {
-    pub session_token: String,
+    pub session_token: Secret<String>,
 }
 
 #[derive(Debug, Serialize, Default, Deserialize)]
@@ -41,19 +41,19 @@ pub struct NuveiSessionRequest {
     pub merchant_site_id: Secret<String>,
     pub client_request_id: String,
     pub time_stamp: date_time::DateTime<date_time::YYYYMMDDHHmmss>,
-    pub checksum: String,
+    pub checksum: Secret<String>,
 }
 
 #[derive(Debug, Serialize, Default, Clone, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct NuveiSessionResponse {
-    pub session_token: String,
+    pub session_token: Secret<String>,
     pub internal_request_id: i64,
     pub status: String,
     pub err_code: i64,
     pub reason: String,
-    pub merchant_id: String,
-    pub merchant_site_id: String,
+    pub merchant_id: Secret<String>,
+    pub merchant_site_id: Secret<String>,
     pub version: String,
     pub client_request_id: String,
 }
@@ -63,7 +63,7 @@ pub struct NuveiSessionResponse {
 #[serde(rename_all = "camelCase")]
 pub struct NuveiPaymentsRequest {
     pub time_stamp: String,
-    pub session_token: String,
+    pub session_token: Secret<String>,
     pub merchant_id: Secret<String>,
     pub merchant_site_id: Secret<String>,
     pub client_request_id: Secret<String>,
@@ -76,7 +76,7 @@ pub struct NuveiPaymentsRequest {
     pub is_rebilling: Option<String>,
     pub payment_option: PaymentOption,
     pub device_details: Option<DeviceDetails>,
-    pub checksum: String,
+    pub checksum: Secret<String>,
     pub billing_address: Option<BillingAddress>,
     pub related_transaction_id: Option<String>,
     pub url_details: Option<UrlDetails>,
@@ -92,14 +92,14 @@ pub struct UrlDetails {
 
 #[derive(Debug, Serialize, Default)]
 pub struct NuveiInitPaymentRequest {
-    pub session_token: String,
-    pub merchant_id: String,
-    pub merchant_site_id: String,
+    pub session_token: Secret<String>,
+    pub merchant_id: Secret<String>,
+    pub merchant_site_id: Secret<String>,
     pub client_request_id: String,
     pub amount: String,
     pub currency: String,
     pub payment_option: PaymentOption,
-    pub checksum: String,
+    pub checksum: Secret<String>,
 }
 
 /// Handles payment request for capture, void and refund flows
@@ -113,13 +113,13 @@ pub struct NuveiPaymentFlowRequest {
     pub amount: String,
     pub currency: diesel_models::enums::Currency,
     pub related_transaction_id: Option<String>,
-    pub checksum: String,
+    pub checksum: Secret<String>,
 }
 
 #[derive(Debug, Serialize, Default)]
 #[serde(rename_all = "camelCase")]
 pub struct NuveiPaymentSyncRequest {
-    pub session_token: String,
+    pub session_token: Secret<String>,
 }
 
 #[derive(Debug, Default, Serialize, Deserialize)]
@@ -217,12 +217,12 @@ pub struct Card {
     #[serde(rename = "CVV")]
     pub cvv: Option<Secret<String>>,
     pub three_d: Option<ThreeD>,
-    pub cc_card_number: Option<String>,
-    pub bin: Option<String>,
-    pub last4_digits: Option<String>,
-    pub cc_exp_month: Option<String>,
-    pub cc_exp_year: Option<String>,
-    pub acquirer_id: Option<String>,
+    pub cc_card_number: Option<Secret<String>>,
+    pub bin: Option<Secret<String>>,
+    pub last4_digits: Option<Secret<String>>,
+    pub cc_exp_month: Option<Secret<String>>,
+    pub cc_exp_year: Option<Secret<String>>,
+    pub acquirer_id: Option<Secret<String>>,
     pub cvv2_reply: Option<String>,
     pub avs_code: Option<String>,
     pub card_type: Option<String>,
@@ -260,7 +260,7 @@ pub struct ThreeD {
     #[serde(rename = "merchantURL")]
     pub merchant_url: Option<String>,
     pub acs_url: Option<String>,
-    pub c_req: Option<String>,
+    pub c_req: Option<Secret<String>>,
     pub platform_type: Option<PlatformType>,
     pub v2supported: Option<String>,
     pub v2_additional_params: Option<V2AdditionalParams>,
@@ -291,7 +291,7 @@ pub enum PlatformType {
 #[serde(rename_all = "camelCase")]
 pub struct BrowserDetails {
     pub accept_header: String,
-    pub ip: Secret<String, pii::IpAddress>,
+    pub ip: Secret<String, IpAddress>,
     pub java_enabled: String,
     pub java_script_enabled: String,
     pub language: String,
@@ -315,7 +315,7 @@ pub struct V2AdditionalParams {
 #[derive(Debug, Clone, Default, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct DeviceDetails {
-    pub ip_address: Secret<String, pii::IpAddress>,
+    pub ip_address: Secret<String, IpAddress>,
 }
 
 impl From<enums::CaptureMethod> for TransactionType {
@@ -329,15 +329,15 @@ impl From<enums::CaptureMethod> for TransactionType {
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct NuveiRedirectionResponse {
-    pub cres: String,
+    pub cres: Secret<String>,
 }
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct NuveiACSResponse {
     #[serde(rename = "threeDSServerTransID")]
-    pub three_ds_server_trans_id: String,
+    pub three_ds_server_trans_id: Secret<String>,
     #[serde(rename = "acsTransID")]
-    pub acs_trans_id: String,
+    pub acs_trans_id: Secret<String>,
     pub message_type: String,
     pub message_version: String,
     pub trans_status: Option<LiabilityShift>,
@@ -394,13 +394,13 @@ impl TryFrom<&types::PaymentsAuthorizeSessionTokenRouterData> for NuveiSessionRe
             merchant_site_id: merchant_site_id.clone(),
             client_request_id: client_request_id.clone(),
             time_stamp: time_stamp.clone(),
-            checksum: encode_payload(&[
+            checksum: Secret::new(encode_payload(&[
                 merchant_id.peek(),
                 merchant_site_id.peek(),
                 &client_request_id,
                 &time_stamp.to_string(),
                 merchant_secret.peek(),
-            ])?,
+            ])?),
         })
     }
 }
@@ -415,9 +415,9 @@ impl<F, T>
     ) -> Result<Self, Self::Error> {
         Ok(Self {
             status: enums::AttemptStatus::Pending,
-            session_token: Some(item.response.session_token.clone()),
+            session_token: Some(item.response.session_token.clone().expose()),
             response: Ok(types::PaymentsResponseData::SessionTokenResponse {
-                session_token: item.response.session_token,
+                session_token: item.response.session_token.expose(),
             }),
             ..item.data
         })
@@ -866,7 +866,7 @@ impl<F>
             currency: item.request.currency,
             connector_auth_type: item.connector_auth_type.clone(),
             client_request_id: item.connector_request_reference_id.clone(),
-            session_token: data.1,
+            session_token: Secret::new(data.1),
             capture_method: item.request.capture_method,
             ..Default::default()
         })?;
@@ -1015,10 +1015,12 @@ impl From<NuveiCardDetails> for PaymentOption {
     }
 }
 
-impl TryFrom<(&types::PaymentsCompleteAuthorizeRouterData, String)> for NuveiPaymentsRequest {
+impl TryFrom<(&types::PaymentsCompleteAuthorizeRouterData, Secret<String>)>
+    for NuveiPaymentsRequest
+{
     type Error = error_stack::Report<errors::ConnectorError>;
     fn try_from(
-        data: (&types::PaymentsCompleteAuthorizeRouterData, String),
+        data: (&types::PaymentsCompleteAuthorizeRouterData, Secret<String>),
     ) -> Result<Self, Self::Error> {
         let item = data.0;
         let request_data = match item.request.payment_method_data.clone() {
@@ -1067,7 +1069,7 @@ impl TryFrom<NuveiPaymentRequestData> for NuveiPaymentsRequest {
     type Error = error_stack::Report<errors::ConnectorError>;
     fn try_from(request: NuveiPaymentRequestData) -> Result<Self, Self::Error> {
         let session_token = request.session_token;
-        fp_utils::when(session_token.is_empty(), || {
+        fp_utils::when(session_token.clone().expose().is_empty(), || {
             Err(errors::ConnectorError::FailedToObtainAuthType)
         })?;
         let connector_meta: NuveiAuthType = NuveiAuthType::try_from(&request.connector_auth_type)?;
@@ -1089,7 +1091,7 @@ impl TryFrom<NuveiPaymentRequestData> for NuveiPaymentsRequest {
                 .capture_method
                 .map(TransactionType::from)
                 .unwrap_or_default(),
-            checksum: encode_payload(&[
+            checksum: Secret::new(encode_payload(&[
                 merchant_id.peek(),
                 merchant_site_id.peek(),
                 &client_request_id,
@@ -1097,7 +1099,7 @@ impl TryFrom<NuveiPaymentRequestData> for NuveiPaymentsRequest {
                 &request.currency.to_string(),
                 &time_stamp,
                 merchant_secret.peek(),
-            ])?,
+            ])?),
             amount: request.amount,
             currency: request.currency,
             ..Default::default()
@@ -1122,7 +1124,7 @@ impl TryFrom<NuveiPaymentRequestData> for NuveiPaymentFlowRequest {
             merchant_site_id: merchant_site_id.to_owned(),
             client_request_id: client_request_id.clone(),
             time_stamp: time_stamp.clone(),
-            checksum: encode_payload(&[
+            checksum: Secret::new(encode_payload(&[
                 merchant_id.peek(),
                 merchant_site_id.peek(),
                 &client_request_id,
@@ -1131,7 +1133,7 @@ impl TryFrom<NuveiPaymentRequestData> for NuveiPaymentFlowRequest {
                 &request.related_transaction_id.clone().unwrap_or_default(),
                 &time_stamp,
                 merchant_secret.peek(),
-            ])?,
+            ])?),
             amount: request.amount,
             currency: request.currency,
             related_transaction_id: request.related_transaction_id,
@@ -1146,7 +1148,7 @@ pub struct NuveiPaymentRequestData {
     pub related_transaction_id: Option<String>,
     pub client_request_id: String,
     pub connector_auth_type: types::ConnectorAuthType,
-    pub session_token: String,
+    pub session_token: Secret<String>,
     pub capture_method: Option<diesel_models::enums::CaptureMethod>,
 }
 
@@ -1273,7 +1275,7 @@ impl From<NuveiTransactionStatus> for enums::AttemptStatus {
 #[serde(rename_all = "camelCase")]
 pub struct NuveiPaymentsResponse {
     pub order_id: Option<String>,
-    pub user_token_id: Option<String>,
+    pub user_token_id: Option<Secret<String>>,
     pub payment_option: Option<PaymentOption>,
     pub transaction_status: Option<NuveiTransactionStatus>,
     pub gw_error_code: Option<i64>,
@@ -1287,15 +1289,16 @@ pub struct NuveiPaymentsResponse {
     pub auth_code: Option<String>,
     pub custom_data: Option<String>,
     pub fraud_details: Option<FraudDetails>,
-    pub external_scheme_transaction_id: Option<String>,
-    pub session_token: Option<String>,
+    pub external_scheme_transaction_id: Option<Secret<String>>,
+    pub session_token: Option<Secret<String>>,
+    //The ID of the transaction in the merchant’s system.
     pub client_unique_id: Option<String>,
     pub internal_request_id: Option<i64>,
     pub status: NuveiPaymentStatus,
     pub err_code: Option<i64>,
     pub reason: Option<String>,
-    pub merchant_id: Option<String>,
-    pub merchant_site_id: Option<String>,
+    pub merchant_id: Option<Secret<String>>,
+    pub merchant_site_id: Option<Secret<String>>,
     pub version: Option<String>,
     pub client_request_id: Option<String>,
 }
@@ -1417,7 +1420,10 @@ where
                 .map(|(base_url, creq)| services::RedirectForm::Form {
                     endpoint: base_url,
                     method: services::Method::Post,
-                    form_fields: std::collections::HashMap::from([("creq".to_string(), creq)]),
+                    form_fields: std::collections::HashMap::from([(
+                        "creq".to_string(),
+                        creq.expose(),
+                    )]),
                 }),
         };