refactor(router): throw bad request error on applepay verification failure (#2607)

Author: prajjwalkumar17

crates/router/src/core/payments/transformers.rs

@@ -449,7 +449,7 @@ where
         headers.extend(
             external_latency
                 .map(|latency| vec![(X_HS_LATENCY.to_string(), latency.to_string())])
-                .unwrap_or(vec![]),
+                .unwrap_or_default(),
         );
     }
     let output = Ok(match payment_request {

crates/router/src/core/verification.rs

@@ -85,7 +85,7 @@ pub async fn verify_merchant_creds_for_applepay(
         response.change_context(api_error_response::ApiErrorResponse::InternalServerError)?;
 
     // Error is already logged
-    Ok(match applepay_response {
+    match applepay_response {
         Ok(_) => {
             utils::check_existence_and_add_domain_to_db(
                 &state,
@@ -95,17 +95,20 @@ pub async fn verify_merchant_creds_for_applepay(
             )
             .await
             .change_context(api_error_response::ApiErrorResponse::InternalServerError)?;
-            services::api::ApplicationResponse::Json(ApplepayMerchantResponse {
-                status_message: "Applepay verification Completed".to_string(),
-            })
+            Ok(services::api::ApplicationResponse::Json(
+                ApplepayMerchantResponse {
+                    status_message: "Applepay verification Completed".to_string(),
+                },
+            ))
         }
         Err(error) => {
             logger::error!(?error);
-            services::api::ApplicationResponse::Json(ApplepayMerchantResponse {
-                status_message: "Applepay verification Failed".to_string(),
-            })
+            Err(api_error_response::ApiErrorResponse::InvalidRequestData {
+                message: "Applepay verification Failed".to_string(),
+            }
+            .into())
         }
-    })
+    }
 }
 
 pub async fn get_verified_apple_domains_with_mid_mca_id(