diff --git a/src/domains/ecommerce-app/api/ecommerce-helpdesk-api/v1/_openapi.json.tpl b/src/domains/ecommerce-app/api/ecommerce-helpdesk-api/v1/_openapi.json.tpl
index 6cf09dafa3..e4641c8dcf 100644
--- a/src/domains/ecommerce-app/api/ecommerce-helpdesk-api/v1/_openapi.json.tpl
+++ b/src/domains/ecommerce-app/api/ecommerce-helpdesk-api/v1/_openapi.json.tpl
@@ -1442,6 +1442,36 @@
           "endDate"
         ]
       },
+      "DeadLetterExcludedStatuses": {
+        "type": "object",
+        "properties": {
+          "ecommerceStatuses": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "List of eCommerce statuses to exclude",
+            "example": [
+              "NOTIFIED_OK"
+            ]
+          },
+          "npgStatuses": {
+            "type": "array",
+            "items": {
+              "type": "string"
+            },
+            "description": "List of NPG statuses to exclude",
+            "example": [
+              "DECLINED",
+              "CANCELLED"
+            ]
+          }
+        },
+        "required": [
+          "ecommerceStatuses",
+          "npgStatuses"
+        ]
+      },
       "SearchPgsStatusResponse": {
         "type": "object",
         "properties": {
@@ -2147,6 +2177,9 @@
                 },
                 "timeRange": {
                   "$ref": "#/components/schemas/DeadLetterSearchDateTimeRange"
+                },
+                "excludedStatuses": {
+                  "$ref": "#/components/schemas/DeadLetterExcludedStatuses"
                 }
               },
               "required": [
@@ -2167,6 +2200,24 @@
                     "endDate": "2023-01-01T02:00:00.000Z"
                   }
                 }
+              },
+              "search by source with time range and excluded statuses": {
+                "value": {
+                  "source": "ALL",
+                  "timeRange": {
+                    "startDate": "2023-01-01T00:00:00.000Z",
+                    "endDate": "2023-01-01T02:00:00.000Z"
+                  },
+                  "excludedStatuses": {
+                    "ecommerceStatuses": [
+                      "NOTIFIED_OK"
+                    ],
+                    "npgStatuses": [
+                      "DECLINED",
+                      "CANCELLED"
+                    ]
+                  }
+                }
               }
             }
           }
@@ -2242,4 +2293,4 @@
       }
     }
   }
-}
\ No newline at end of file
+}
diff --git a/src/domains/ecommerce-common/03_cosmosdb.tf b/src/domains/ecommerce-common/03_cosmosdb.tf
index 1a8b052b51..f4c37b3455 100644
--- a/src/domains/ecommerce-common/03_cosmosdb.tf
+++ b/src/domains/ecommerce-common/03_cosmosdb.tf
@@ -34,7 +34,7 @@ module "cosmosdb_account_mongodb" {
   offer_type   = var.cosmos_mongo_db_params.offer_type
   kind         = var.cosmos_mongo_db_params.kind
   capabilities = var.cosmos_mongo_db_params.capabilities
-  #version commented out since using 6.0 version here raise the following error 
+  #version commented out since using 6.0 version here raise the following error
   # `expected mongo_server_version to be one of [3.2 3.6 4.0 4.2], got 6.0``
   # Leaving mongo_server_version parameter here causes plan diff for each plan
   # so it was simply commented out so that actual version is ignored
@@ -159,6 +159,14 @@ locals {
         {
           keys   = ["insertionDate"]
           unique = false
+        },
+        {
+          keys   = ["transactionInfo.eCommerceStatus"]
+          unique = false
+        },
+        {
+          keys   = ["transactionInfo.details.operationResult"]
+          unique = false
         }
       ]
       shard_key           = "_id",
@@ -304,4 +312,4 @@ resource "azurerm_monitor_metric_alert" "cosmos_db_normalized_ru_exceeded" {
   }
 
   tags = var.tags
-}
\ No newline at end of file
+}