diff --git a/reference/OpenAPI.json b/reference/OpenAPI.json
index 93e35f3b5..dc7261ee8 100644
--- a/reference/OpenAPI.json
+++ b/reference/OpenAPI.json
@@ -515,6 +515,65 @@
         "type": "string",
         "example": "camp_rRsfatlwN7unSeUIJDCYedal"
       },
+      "ParameterCustomerValidateVoucherClientSide": {
+        "oneOf": [
+          {
+            "type": "object",
+            "title": "Customer details",
+            "description": "Customer source ID and/or customer metadata.",
+            "properties": {
+              "source_id": {
+                "type": "string",
+                "description": "Customer source ID.",
+                "example": "name.lastname@email.com"
+              },
+              "metadata": {
+                "type": "object",
+                "description": "A set of custom key/value pairs that you can attach to a customer. The metadata object stores all custom attributes assigned to the customer. It can be useful for storing additional information about the customer in a structured format. This metadata can be used for validating whether the customer qualifies for a discount or it can be used in building customer segments.",
+                "style": "deepObject",
+                "explode": true
+              }
+            },
+            "style": "deepObject",
+            "explode": true
+          },
+          {
+            "type": "string",
+            "title": "Customer ID",
+            "description": "Unique customer ID assigned by Voucherify, i.e. `cust_eWgXlBBiY6THFRJwX45Iakv4`.",
+            "example": "cust_eWgXlBBiY6THFRJwX45Iakv4"
+          }
+        ]
+      },
+      "ParameterOrderValidateVoucherClientSide": {
+        "type": "object",
+        "title": "Order details",
+        "description": "Order details.",
+        "properties": {
+          "metadata": {
+            "type": "object",
+            "description": "The metadata object stores all custom attributes assigned to the order. A set of key/value pairs that are attached to an order object. Stores additional information about the order in a structured format.",
+            "style": "deepObject",
+            "explode": true
+          }
+        }
+      },
+      "ParameterSessionKey": {
+        "type": "string",
+        "example": "ssn_yQGMTeKBSw8OOuFPwlBEjzGy8d8VA9Ts"
+      },
+      "ParameterSessionTtlUnit": {
+        "type": "string",
+        "enum": [
+          "HOURS",
+          "DAYS",
+          "MINUTES",
+          "SECONDS",
+          "MILLISECONDS",
+          "MICROSECONDS",
+          "NANOSECONDS"
+        ]
+      },
       "ParameterPromotionTierId": {
         "type": "string",
         "example": "promo_2EnAik6Jt7dKTOMkRTIgEjZH"
@@ -50586,8 +50645,7 @@
           },
           {
             "schema": {
-              "type": "string",
-              "example": "ssn_yQGMTeKBSw8OOuFPwlBEjzGy8d8VA9Ts"
+              "$ref": "#/components/schemas/ParameterSessionKey"
             },
             "in": "query",
             "name": "session_key",
@@ -50595,7 +50653,7 @@
           },
           {
             "schema": {
-              "type": "integer"
+              "$ref": "#/components/schemas/ParameterInteger"
             },
             "in": "query",
             "name": "session_ttl",
@@ -50603,16 +50661,7 @@
           },
           {
             "schema": {
-              "type": "string",
-              "enum": [
-                "HOURS",
-                "DAYS",
-                "MINUTES",
-                "SECONDS",
-                "MILLISECONDS",
-                "MICROSECONDS",
-                "NANOSECONDS"
-              ]
+              "$ref": "#/components/schemas/ParameterSessionTtlUnit"
             },
             "in": "query",
             "name": "session_ttl_unit",
@@ -50626,7 +50675,7 @@
           },
           {
             "schema": {
-              "type": "string"
+              "$ref": "#/components/schemas/ParameterString"
             },
             "in": "query",
             "name": "session_type",
@@ -50637,34 +50686,7 @@
             "in": "query",
             "required": false,
             "schema": {
-              "oneOf": [
-                {
-                  "type": "object",
-                  "title": "Customer details",
-                  "description": "Customer source ID and/or customer metadata.",
-                  "properties": {
-                    "source_id": {
-                      "type": "string",
-                      "description": "Customer source ID.",
-                      "example": "name.lastname@email.com"
-                    },
-                    "metadata": {
-                      "type": "object",
-                      "description": "A set of custom key/value pairs that you can attach to a customer. The metadata object stores all custom attributes assigned to the customer. It can be useful for storing additional information about the customer in a structured format. This metadata can be used for validating whether the customer qualifies for a discount or it can be used in building customer segments.",
-                      "style": "deepObject",
-                      "explode": true
-                    }
-                  },
-                  "style": "deepObject",
-                  "explode": true
-                },
-                {
-                  "type": "string",
-                  "title": "Customer ID",
-                  "description": "Unique customer ID assigned by Voucherify, i.e. `cust_eWgXlBBiY6THFRJwX45Iakv4`.",
-                  "example": "cust_eWgXlBBiY6THFRJwX45Iakv4"
-                }
-              ]
+              "$ref": "#/components/schemas/ParameterCustomerValidateVoucherClientSide"
             },
             "description": "Customer details."
           },
@@ -50673,20 +50695,10 @@
             "in": "query",
             "required": false,
             "schema": {
-              "type": "object",
-              "title": "Order details",
-              "description": "Order details.",
-              "properties": {
-                "metadata": {
-                  "type": "object",
-                  "description": "The metadata object stores all custom attributes assigned to the order. A set of key/value pairs that are attached to an order object. Stores additional information about the order in a structured format.",
-                  "style": "deepObject",
-                  "explode": true
-                }
-              },
-              "style": "deepObject",
-              "explode": true
+              "$ref": "#/components/schemas/ParameterOrderValidateVoucherClientSide"
             },
+            "style": "deepObject",
+            "explode": true,
             "description": "Order details."
           }
         ],
@@ -51149,7 +51161,7 @@
         "parameters": [
           {
             "schema": {
-              "type": "string"
+              "$ref": "#/components/schemas/ParameterString"
             },
             "in": "query",
             "name": "audienceRulesOnly",