diff --git a/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateRequestBody.java b/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateRequestBody.java
index ed6dceb7..0c3efc81 100644
--- a/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateRequestBody.java
@@ -61,7 +61,7 @@ public class CampaignsVouchersCreateRequestBody {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_REDEMPTION = "redemption";
   @SerializedName(SERIALIZED_NAME_REDEMPTION)
@@ -103,7 +103,7 @@ public void setCategory(String category) {
   }
 
 
-  public CampaignsVouchersCreateRequestBody metadata(Object metadata) {
+  public CampaignsVouchersCreateRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -114,12 +114,12 @@ public CampaignsVouchersCreateRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateResponseBody.java b/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateResponseBody.java
index 55712bdc..e4b79187 100644
--- a/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateResponseBody.java
+++ b/src/main/java/io/voucherify/client/model/CampaignsVouchersCreateResponseBody.java
@@ -242,7 +242,7 @@ public ValidityDayOfWeekEnum read(final JsonReader jsonReader) throws IOExceptio
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_ASSETS = "assets";
   @SerializedName(SERIALIZED_NAME_ASSETS)
@@ -656,7 +656,7 @@ public void setAdditionalInfo(String additionalInfo) {
   }
 
 
-  public CampaignsVouchersCreateResponseBody metadata(Object metadata) {
+  public CampaignsVouchersCreateResponseBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -667,12 +667,12 @@ public CampaignsVouchersCreateResponseBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/CustomersCreateRequestBody.java b/src/main/java/io/voucherify/client/model/CustomersCreateRequestBody.java
index dd449f1c..0c580933 100644
--- a/src/main/java/io/voucherify/client/model/CustomersCreateRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/CustomersCreateRequestBody.java
@@ -93,7 +93,7 @@ public class CustomersCreateRequestBody {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public CustomersCreateRequestBody() {
   }
@@ -287,7 +287,7 @@ public void setAddress(CustomersCreateRequestBodyAddress address) {
   }
 
 
-  public CustomersCreateRequestBody metadata(Object metadata) {
+  public CustomersCreateRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -298,12 +298,12 @@ public CustomersCreateRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/CustomersGetResponseBody.java b/src/main/java/io/voucherify/client/model/CustomersGetResponseBody.java
index 7b4f738f..5d655ce6 100644
--- a/src/main/java/io/voucherify/client/model/CustomersGetResponseBody.java
+++ b/src/main/java/io/voucherify/client/model/CustomersGetResponseBody.java
@@ -175,7 +175,7 @@ public ObjectEnum read(final JsonReader jsonReader) throws IOException {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public CustomersGetResponseBody() {
   }
@@ -537,7 +537,7 @@ public void setAddress(CustomersGetResponseBodyAddress address) {
   }
 
 
-  public CustomersGetResponseBody metadata(Object metadata) {
+  public CustomersGetResponseBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -548,12 +548,12 @@ public CustomersGetResponseBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/CustomersUpdateInBulkRequestBody.java b/src/main/java/io/voucherify/client/model/CustomersUpdateInBulkRequestBody.java
index 2d8a96bd..0731a4cd 100644
--- a/src/main/java/io/voucherify/client/model/CustomersUpdateInBulkRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/CustomersUpdateInBulkRequestBody.java
@@ -89,7 +89,7 @@ public class CustomersUpdateInBulkRequestBody {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public CustomersUpdateInBulkRequestBody() {
   }
@@ -262,7 +262,7 @@ public void setAddress(CustomersUpdateInBulkRequestBodyAddress address) {
   }
 
 
-  public CustomersUpdateInBulkRequestBody metadata(Object metadata) {
+  public CustomersUpdateInBulkRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -273,12 +273,12 @@ public CustomersUpdateInBulkRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/CustomersUpdateRequestBody.java b/src/main/java/io/voucherify/client/model/CustomersUpdateRequestBody.java
index ed5240c7..c8eeb4e1 100644
--- a/src/main/java/io/voucherify/client/model/CustomersUpdateRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/CustomersUpdateRequestBody.java
@@ -85,7 +85,7 @@ public class CustomersUpdateRequestBody {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public CustomersUpdateRequestBody() {
   }
@@ -237,7 +237,7 @@ public void setAddress(CustomersUpdateRequestBodyAddress address) {
   }
 
 
-  public CustomersUpdateRequestBody metadata(Object metadata) {
+  public CustomersUpdateRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -248,12 +248,12 @@ public CustomersUpdateRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/Order.java b/src/main/java/io/voucherify/client/model/Order.java
index 2cda2c6d..b8c081aa 100644
--- a/src/main/java/io/voucherify/client/model/Order.java
+++ b/src/main/java/io/voucherify/client/model/Order.java
@@ -137,7 +137,7 @@ public StatusEnum read(final JsonReader jsonReader) throws IOException {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public Order() {
   }
@@ -297,7 +297,7 @@ public void setItems(List<OrderItem> items) {
   }
 
 
-  public Order metadata(Object metadata) {
+  public Order metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -308,12 +308,12 @@ public Order metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/OrderItem.java b/src/main/java/io/voucherify/client/model/OrderItem.java
index 2b07012c..2dd478af 100644
--- a/src/main/java/io/voucherify/client/model/OrderItem.java
+++ b/src/main/java/io/voucherify/client/model/OrderItem.java
@@ -156,7 +156,7 @@ public RelatedObjectEnum read(final JsonReader jsonReader) throws IOException {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public OrderItem() {
   }
@@ -434,7 +434,7 @@ public void setSku(OrderItemSku sku) {
   }
 
 
-  public OrderItem metadata(Object metadata) {
+  public OrderItem metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -445,12 +445,12 @@ public OrderItem metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/OrdersCreateRequestBody.java b/src/main/java/io/voucherify/client/model/OrdersCreateRequestBody.java
index 7ffd4efb..2b5a193d 100644
--- a/src/main/java/io/voucherify/client/model/OrdersCreateRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/OrdersCreateRequestBody.java
@@ -140,7 +140,7 @@ public StatusEnum read(final JsonReader jsonReader) throws IOException {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_CREATED_AT = "created_at";
   @SerializedName(SERIALIZED_NAME_CREATED_AT)
@@ -316,7 +316,7 @@ public void setItems(List<OrderItem> items) {
   }
 
 
-  public OrdersCreateRequestBody metadata(Object metadata) {
+  public OrdersCreateRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -327,12 +327,12 @@ public OrdersCreateRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/ProductsUpdateInBulkRequestBody.java b/src/main/java/io/voucherify/client/model/ProductsUpdateInBulkRequestBody.java
index aac7f8eb..ab4cc45f 100644
--- a/src/main/java/io/voucherify/client/model/ProductsUpdateInBulkRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/ProductsUpdateInBulkRequestBody.java
@@ -77,7 +77,7 @@ public class ProductsUpdateInBulkRequestBody {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public ProductsUpdateInBulkRequestBody() {
   }
@@ -195,7 +195,7 @@ public void setImageUrl(String imageUrl) {
   }
 
 
-  public ProductsUpdateInBulkRequestBody metadata(Object metadata) {
+  public ProductsUpdateInBulkRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -206,12 +206,12 @@ public ProductsUpdateInBulkRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/ValidationsValidateResponseBodyOrderItemsItem.java b/src/main/java/io/voucherify/client/model/ValidationsValidateResponseBodyOrderItemsItem.java
index bb89d875..5f1e729d 100644
--- a/src/main/java/io/voucherify/client/model/ValidationsValidateResponseBodyOrderItemsItem.java
+++ b/src/main/java/io/voucherify/client/model/ValidationsValidateResponseBodyOrderItemsItem.java
@@ -232,7 +232,7 @@ public ObjectEnum read(final JsonReader jsonReader) throws IOException {
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_APPLICATION_DETAILS = "application_details";
   @SerializedName(SERIALIZED_NAME_APPLICATION_DETAILS)
@@ -661,7 +661,7 @@ public void setObject(ObjectEnum _object) {
   }
 
 
-  public ValidationsValidateResponseBodyOrderItemsItem metadata(Object metadata) {
+  public ValidationsValidateResponseBodyOrderItemsItem metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -672,12 +672,12 @@ public ValidationsValidateResponseBodyOrderItemsItem metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/VoucherBalance.java b/src/main/java/io/voucherify/client/model/VoucherBalance.java
index fc0d2901..f1e9c06a 100644
--- a/src/main/java/io/voucherify/client/model/VoucherBalance.java
+++ b/src/main/java/io/voucherify/client/model/VoucherBalance.java
@@ -158,6 +158,10 @@ public ObjectEnum read(final JsonReader jsonReader) throws IOException {
   @SerializedName(SERIALIZED_NAME_OBJECT)
   private ObjectEnum _object = ObjectEnum.BALANCE;
 
+  public static final String SERIALIZED_NAME_AMOUNT = "amount";
+  @SerializedName(SERIALIZED_NAME_AMOUNT)
+  private Integer amount;
+
   public static final String SERIALIZED_NAME_POINTS = "points";
   @SerializedName(SERIALIZED_NAME_POINTS)
   private Integer points;
@@ -287,6 +291,28 @@ public void setObject(ObjectEnum _object) {
   }
 
 
+  public VoucherBalance amount(Integer amount) {
+    
+    this.amount = amount;
+    return this;
+  }
+
+
+  /**
+   * Amount added or subtracted in the transaction of a loyalty card/gift card
+   * @return amount
+  **/
+  @javax.annotation.Nullable
+  public Integer getAmount() {
+    return amount;
+  }
+
+
+  public void setAmount(Integer amount) {
+    this.amount = amount;
+  }  
+
+
   public VoucherBalance points(Integer points) {
     
     this.points = points;
@@ -384,6 +410,7 @@ public boolean equals(Object o) {
     return Objects.equals(this.type, voucherBalance.type) &&
         Objects.equals(this.total, voucherBalance.total) &&
         Objects.equals(this._object, voucherBalance._object) &&
+        Objects.equals(this.amount, voucherBalance.amount) &&
         Objects.equals(this.points, voucherBalance.points) &&
         Objects.equals(this.balance, voucherBalance.balance) &&
         Objects.equals(this.operationType, voucherBalance.operationType) &&
@@ -396,7 +423,7 @@ private static <T> boolean equalsNullable(JsonNullable<T> a, JsonNullable<T> b)
 
   @Override
   public int hashCode() {
-    return Objects.hash(type, total, _object, points, balance, operationType, relatedObject);
+    return Objects.hash(type, total, _object, amount, points, balance, operationType, relatedObject);
   }
 
   private static <T> int hashCodeNullable(JsonNullable<T> a) {
@@ -413,6 +440,7 @@ public String toString() {
     sb.append("    type: ").append(toIndentedString(type)).append("\n");
     sb.append("    total: ").append(toIndentedString(total)).append("\n");
     sb.append("    _object: ").append(toIndentedString(_object)).append("\n");
+    sb.append("    amount: ").append(toIndentedString(amount)).append("\n");
     sb.append("    points: ").append(toIndentedString(points)).append("\n");
     sb.append("    balance: ").append(toIndentedString(balance)).append("\n");
     sb.append("    operationType: ").append(toIndentedString(operationType)).append("\n");
diff --git a/src/main/java/io/voucherify/client/model/VoucherWithCategories.java b/src/main/java/io/voucherify/client/model/VoucherWithCategories.java
index b3c104df..083dc5b7 100644
--- a/src/main/java/io/voucherify/client/model/VoucherWithCategories.java
+++ b/src/main/java/io/voucherify/client/model/VoucherWithCategories.java
@@ -241,7 +241,7 @@ public ValidityDayOfWeekEnum read(final JsonReader jsonReader) throws IOExceptio
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_ASSETS = "assets";
   @SerializedName(SERIALIZED_NAME_ASSETS)
@@ -651,7 +651,7 @@ public void setAdditionalInfo(String additionalInfo) {
   }
 
 
-  public VoucherWithCategories metadata(Object metadata) {
+  public VoucherWithCategories metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -662,12 +662,12 @@ public VoucherWithCategories metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/VouchersGetResponseBody.java b/src/main/java/io/voucherify/client/model/VouchersGetResponseBody.java
index c2229d0b..69c1545c 100644
--- a/src/main/java/io/voucherify/client/model/VouchersGetResponseBody.java
+++ b/src/main/java/io/voucherify/client/model/VouchersGetResponseBody.java
@@ -242,7 +242,7 @@ public ValidityDayOfWeekEnum read(final JsonReader jsonReader) throws IOExceptio
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   public static final String SERIALIZED_NAME_ASSETS = "assets";
   @SerializedName(SERIALIZED_NAME_ASSETS)
@@ -656,7 +656,7 @@ public void setAdditionalInfo(String additionalInfo) {
   }
 
 
-  public VouchersGetResponseBody metadata(Object metadata) {
+  public VouchersGetResponseBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -667,12 +667,12 @@ public VouchersGetResponseBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }
 
diff --git a/src/main/java/io/voucherify/client/model/VouchersUpdateRequestBody.java b/src/main/java/io/voucherify/client/model/VouchersUpdateRequestBody.java
index 12642523..1854e4c2 100644
--- a/src/main/java/io/voucherify/client/model/VouchersUpdateRequestBody.java
+++ b/src/main/java/io/voucherify/client/model/VouchersUpdateRequestBody.java
@@ -154,7 +154,7 @@ public ValidityDayOfWeekEnum read(final JsonReader jsonReader) throws IOExceptio
 
   public static final String SERIALIZED_NAME_METADATA = "metadata";
   @SerializedName(SERIALIZED_NAME_METADATA)
-  private Object metadata;
+  private Map<String, Object> metadata;
 
   /**
    * Defines the type of the voucher. 
@@ -409,7 +409,7 @@ public void setAdditionalInfo(String additionalInfo) {
   }
 
 
-  public VouchersUpdateRequestBody metadata(Object metadata) {
+  public VouchersUpdateRequestBody metadata(Map<String, Object> metadata) {
     
     this.metadata = metadata;
     return this;
@@ -420,12 +420,12 @@ public VouchersUpdateRequestBody metadata(Object metadata) {
    * @return metadata
   **/
   @javax.annotation.Nullable
-  public Object getMetadata() {
+  public Map<String, Object> getMetadata() {
     return metadata;
   }
 
 
-  public void setMetadata(Object metadata) {
+  public void setMetadata(Map<String, Object> metadata) {
     this.metadata = metadata;
   }