Issue:
Bug: Change type name from `MandateTxnType` to `MandateTransactionType`



              Would be preferable if we could avoid the `Txn` and use `Transaction` instead. I'm okay with taking this up on a separate PR.

_Originally posted by @SanchithHegde in https://github.com/juspay/hyperswitch/pull/1188#discussion_r1198567741_
            

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Change type name from MandateTxnType to MandateTransactionType, as we avoid abbreviations like `transaction -> txn` as much as possible in our code, and use verbose names instead.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

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1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
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If it fixes an open issue, please link to the issue here.

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## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
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This does not affect any apis
<img width="869" alt="Screenshot 2023-06-05 at 11 32 52 AM" src="https://github.com/juspay/hyperswitch/assets/83439957/e4f080b1-6f36-4b5a-83b1-7ebf69ce96ff">



## 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 submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

This does not affect any apis
<img width="869" alt="Screenshot 2023-06-05 at 11 32 52 AM" src="https://github.com/juspay/hyperswitch/assets/83439957/e4f080b1-6f36-4b5a-83b1-7ebf69ce96ff">

Patch:
diff --git a/crates/api_models/src/payments.rs b/crates/api_models/src/payments.rs
index bcdb75824c1..c5e0e6977ca 100644
--- a/crates/api_models/src/payments.rs
+++ b/crates/api_models/src/payments.rs
@@ -341,9 +341,9 @@ pub struct VerifyRequest {
 
 #[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
 #[serde(rename_all = "snake_case")]
-pub enum MandateTxnType {
-    NewMandateTxn,
-    RecurringMandateTxn,
+pub enum MandateTransactionType {
+    NewMandateTransaction,
+    RecurringMandateTransaction,
 }
 
 #[derive(Default, Eq, PartialEq, Debug, serde::Deserialize, serde::Serialize, Clone)]
diff --git a/crates/router/src/core/payments/helpers.rs b/crates/router/src/core/payments/helpers.rs
index c32f710cf80..8e7240bcc88 100644
--- a/crates/router/src/core/payments/helpers.rs
+++ b/crates/router/src/core/payments/helpers.rs
@@ -267,7 +267,7 @@ pub async fn get_address_by_id(
 pub async fn get_token_pm_type_mandate_details(
     state: &AppState,
     request: &api::PaymentsRequest,
-    mandate_type: Option<api::MandateTxnType>,
+    mandate_type: Option<api::MandateTransactionType>,
     merchant_account: &domain::MerchantAccount,
 ) -> RouterResult<(
     Option<String>,
@@ -277,7 +277,7 @@ pub async fn get_token_pm_type_mandate_details(
     Option<String>,
 )> {
     match mandate_type {
-        Some(api::MandateTxnType::NewMandateTxn) => {
+        Some(api::MandateTransactionType::NewMandateTransaction) => {
             let setup_mandate = request
                 .mandate_data
                 .clone()
@@ -290,7 +290,7 @@ pub async fn get_token_pm_type_mandate_details(
                 None,
             ))
         }
-        Some(api::MandateTxnType::RecurringMandateTxn) => {
+        Some(api::MandateTransactionType::RecurringMandateTransaction) => {
             let (token_, payment_method_, payment_method_type_, mandate_connector) =
                 get_token_for_recurring_mandate(state, request, merchant_account).await?;
             Ok((
@@ -515,20 +515,22 @@ pub fn validate_card_data(
 pub fn validate_mandate(
     req: impl Into<api::MandateValidationFields>,
     is_confirm_operation: bool,
-) -> CustomResult<Option<api::MandateTxnType>, errors::ApiErrorResponse> {
+) -> CustomResult<Option<api::MandateTransactionType>, errors::ApiErrorResponse> {
     let req: api::MandateValidationFields = req.into();
     match req.validate_and_get_mandate_type().change_context(
         errors::ApiErrorResponse::MandateValidationFailed {
             reason: "Expected one out of mandate_id and mandate_data but got both".to_string(),
         },
     )? {
-        Some(api::MandateTxnType::NewMandateTxn) => {
+        Some(api::MandateTransactionType::NewMandateTransaction) => {
             validate_new_mandate_request(req, is_confirm_operation)?;
-            Ok(Some(api::MandateTxnType::NewMandateTxn))
+            Ok(Some(api::MandateTransactionType::NewMandateTransaction))
         }
-        Some(api::MandateTxnType::RecurringMandateTxn) => {
+        Some(api::MandateTransactionType::RecurringMandateTransaction) => {
             validate_recurring_mandate(req)?;
-            Ok(Some(api::MandateTxnType::RecurringMandateTxn))
+            Ok(Some(
+                api::MandateTransactionType::RecurringMandateTransaction,
+            ))
         }
         None => Ok(None),
     }
@@ -1718,15 +1720,17 @@ pub(crate) fn validate_pm_or_token_given(
     payment_method: &Option<api_enums::PaymentMethod>,
     payment_method_data: &Option<api::PaymentMethodData>,
     payment_method_type: &Option<api_enums::PaymentMethodType>,
-    mandate_type: &Option<api::MandateTxnType>,
+    mandate_type: &Option<api::MandateTransactionType>,
     token: &Option<String>,
 ) -> Result<(), errors::ApiErrorResponse> {
     utils::when(
         !matches!(
             payment_method_type,
             Some(api_enums::PaymentMethodType::Paypal)
-        ) && !matches!(mandate_type, Some(api::MandateTxnType::RecurringMandateTxn))
-            && token.is_none()
+        ) && !matches!(
+            mandate_type,
+            Some(api::MandateTransactionType::RecurringMandateTransaction)
+        ) && token.is_none()
             && (payment_method_data.is_none() || payment_method.is_none()),
         || {
             Err(errors::ApiErrorResponse::InvalidRequestData {
diff --git a/crates/router/src/core/payments/operations.rs b/crates/router/src/core/payments/operations.rs
index dc39c073a97..7b39d6e4477 100644
--- a/crates/router/src/core/payments/operations.rs
+++ b/crates/router/src/core/payments/operations.rs
@@ -69,7 +69,7 @@ pub trait Operation<F: Clone, T>: Send + std::fmt::Debug {
 pub struct ValidateResult<'a> {
     pub merchant_id: &'a str,
     pub payment_id: api::PaymentIdType,
-    pub mandate_type: Option<api::MandateTxnType>,
+    pub mandate_type: Option<api::MandateTransactionType>,
     pub storage_scheme: enums::MerchantStorageScheme,
 }
 
@@ -90,7 +90,7 @@ pub trait GetTracker<F, D, R>: Send {
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &R,
-        mandate_type: Option<api::MandateTxnType>,
+        mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         mechant_key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(BoxedOperation<'a, F, R>, D, Option<CustomerDetails>)>;
diff --git a/crates/router/src/core/payments/operations/payment_cancel.rs b/crates/router/src/core/payments/operations/payment_cancel.rs
index fd119465612..b522be80651 100644
--- a/crates/router/src/core/payments/operations/payment_cancel.rs
+++ b/crates/router/src/core/payments/operations/payment_cancel.rs
@@ -34,7 +34,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsCancelRequest>
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsCancelRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_capture.rs b/crates/router/src/core/payments/operations/payment_capture.rs
index 2f6696dedb6..82f6b895db1 100644
--- a/crates/router/src/core/payments/operations/payment_capture.rs
+++ b/crates/router/src/core/payments/operations/payment_capture.rs
@@ -35,7 +35,7 @@ impl<F: Send + Clone> GetTracker<F, payments::PaymentData<F>, api::PaymentsCaptu
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsCaptureRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_complete_authorize.rs b/crates/router/src/core/payments/operations/payment_complete_authorize.rs
index eb581f9cde0..9f52c471456 100644
--- a/crates/router/src/core/payments/operations/payment_complete_authorize.rs
+++ b/crates/router/src/core/payments/operations/payment_complete_authorize.rs
@@ -36,7 +36,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Co
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsRequest,
-        mandate_type: Option<api::MandateTxnType>,
+        mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_confirm.rs b/crates/router/src/core/payments/operations/payment_confirm.rs
index c6a9ef6c0e5..91809e1415c 100644
--- a/crates/router/src/core/payments/operations/payment_confirm.rs
+++ b/crates/router/src/core/payments/operations/payment_confirm.rs
@@ -37,7 +37,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsRequest,
-        mandate_type: Option<api::MandateTxnType>,
+        mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_create.rs b/crates/router/src/core/payments/operations/payment_create.rs
index 4b9d78c3a7c..f595818823a 100644
--- a/crates/router/src/core/payments/operations/payment_create.rs
+++ b/crates/router/src/core/payments/operations/payment_create.rs
@@ -45,7 +45,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsRequest,
-        mandate_type: Option<api::MandateTxnType>,
+        mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         merchant_key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_method_validate.rs b/crates/router/src/core/payments/operations/payment_method_validate.rs
index ff63ed050ae..f2bc4abb8f0 100644
--- a/crates/router/src/core/payments/operations/payment_method_validate.rs
+++ b/crates/router/src/core/payments/operations/payment_method_validate.rs
@@ -69,7 +69,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::VerifyRequest> for Paym
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::VerifyRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         _mechant_key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_session.rs b/crates/router/src/core/payments/operations/payment_session.rs
index f96efe544e8..5589fca3f98 100644
--- a/crates/router/src/core/payments/operations/payment_session.rs
+++ b/crates/router/src/core/payments/operations/payment_session.rs
@@ -37,7 +37,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsSessionRequest>
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsSessionRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_start.rs b/crates/router/src/core/payments/operations/payment_start.rs
index fd36baffb54..5cd2d11c081 100644
--- a/crates/router/src/core/payments/operations/payment_start.rs
+++ b/crates/router/src/core/payments/operations/payment_start.rs
@@ -33,7 +33,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsStartRequest> f
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         _request: &api::PaymentsStartRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         mechant_key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_status.rs b/crates/router/src/core/payments/operations/payment_status.rs
index 6b66c902235..5d22bd3b0a8 100644
--- a/crates/router/src/core/payments/operations/payment_status.rs
+++ b/crates/router/src/core/payments/operations/payment_status.rs
@@ -158,7 +158,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRetrieveRequest
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsRetrieveRequest,
-        _mandate_type: Option<api::MandateTxnType>,
+        _mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/core/payments/operations/payment_update.rs b/crates/router/src/core/payments/operations/payment_update.rs
index 3acae6a2fb4..507f4034e6f 100644
--- a/crates/router/src/core/payments/operations/payment_update.rs
+++ b/crates/router/src/core/payments/operations/payment_update.rs
@@ -36,7 +36,7 @@ impl<F: Send + Clone> GetTracker<F, PaymentData<F>, api::PaymentsRequest> for Pa
         state: &'a AppState,
         payment_id: &api::PaymentIdType,
         request: &api::PaymentsRequest,
-        mandate_type: Option<api::MandateTxnType>,
+        mandate_type: Option<api::MandateTransactionType>,
         merchant_account: &domain::MerchantAccount,
         key_store: &domain::MerchantKeyStore,
     ) -> RouterResult<(
diff --git a/crates/router/src/types/api/payments.rs b/crates/router/src/types/api/payments.rs
index 067121d22b9..7cccae18e13 100644
--- a/crates/router/src/types/api/payments.rs
+++ b/crates/router/src/types/api/payments.rs
@@ -1,6 +1,6 @@
 pub use api_models::payments::{
     AcceptanceType, Address, AddressDetails, Amount, AuthenticationForStartResponse, Card,
-    CustomerAcceptance, MandateData, MandateTxnType, MandateType, MandateValidationFields,
+    CustomerAcceptance, MandateData, MandateTransactionType, MandateType, MandateValidationFields,
     NextActionType, OnlineMandate, PayLaterData, PaymentIdType, PaymentListConstraints,
     PaymentListResponse, PaymentMethodData, PaymentMethodDataResponse, PaymentOp,
     PaymentRetrieveBody, PaymentRetrieveBodyWithCredentials, PaymentsCancelRequest,
@@ -20,15 +20,15 @@ use crate::{
 };
 
 pub(crate) trait PaymentsRequestExt {
-    fn is_mandate(&self) -> Option<MandateTxnType>;
+    fn is_mandate(&self) -> Option<MandateTransactionType>;
 }
 
 impl PaymentsRequestExt for PaymentsRequest {
-    fn is_mandate(&self) -> Option<MandateTxnType> {
+    fn is_mandate(&self) -> Option<MandateTransactionType> {
         match (&self.mandate_data, &self.mandate_id) {
             (None, None) => None,
-            (_, Some(_)) => Some(MandateTxnType::RecurringMandateTxn),
-            (Some(_), _) => Some(MandateTxnType::NewMandateTxn),
+            (_, Some(_)) => Some(MandateTransactionType::RecurringMandateTransaction),
+            (Some(_), _) => Some(MandateTransactionType::NewMandateTransaction),
         }
     }
 }
@@ -115,21 +115,21 @@ impl PaymentIdTypeExt for PaymentIdType {
 pub(crate) trait MandateValidationFieldsExt {
     fn validate_and_get_mandate_type(
         &self,
-    ) -> errors::CustomResult<Option<MandateTxnType>, errors::ValidationError>;
+    ) -> errors::CustomResult<Option<MandateTransactionType>, errors::ValidationError>;
 }
 
 impl MandateValidationFieldsExt for MandateValidationFields {
     fn validate_and_get_mandate_type(
         &self,
-    ) -> errors::CustomResult<Option<MandateTxnType>, errors::ValidationError> {
+    ) -> errors::CustomResult<Option<MandateTransactionType>, errors::ValidationError> {
         match (&self.mandate_data, &self.mandate_id) {
             (None, None) => Ok(None),
             (Some(_), Some(_)) => Err(errors::ValidationError::InvalidValue {
                 message: "Expected one out of mandate_id and mandate_data but got both".to_string(),
             })
             .into_report(),
-            (_, Some(_)) => Ok(Some(MandateTxnType::RecurringMandateTxn)),
-            (Some(_), _) => Ok(Some(MandateTxnType::NewMandateTxn)),
+            (_, Some(_)) => Ok(Some(MandateTransactionType::RecurringMandateTransaction)),
+            (Some(_), _) => Ok(Some(MandateTransactionType::NewMandateTransaction)),
         }
     }
 }