diff --git a/src/main/java/com/adyen/model/balancecontrol/Amount.java b/src/main/java/com/adyen/model/balancecontrol/Amount.java
index 076c43f80..2fedd397b 100644
--- a/src/main/java/com/adyen/model/balancecontrol/Amount.java
+++ b/src/main/java/com/adyen/model/balancecontrol/Amount.java
@@ -11,6 +11,8 @@
 
 package com.adyen.model.balancecontrol;
 
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -23,9 +25,21 @@ public class Amount {
   public static final String JSON_PROPERTY_CURRENCY = "currency";
   private String currency;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetCurrency = false;
+
   public static final String JSON_PROPERTY_VALUE = "value";
   private Long value;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetValue = false;
+
+  /**
+   * Sets whether attributes with null values should be explicitly included in the JSON payload.
+   * Default is false.
+   */
+  @JsonIgnore private boolean includeNullValues = false;
+
   public Amount() {}
 
   /**
@@ -38,6 +52,7 @@ public Amount() {}
    */
   public Amount currency(String currency) {
     this.currency = currency;
+    isSetCurrency = true; // mark as set
     return this;
   }
 
@@ -65,6 +80,7 @@ public String getCurrency() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCurrency(String currency) {
     this.currency = currency;
+    isSetCurrency = true; // mark as set
   }
 
   /**
@@ -77,6 +93,7 @@ public void setCurrency(String currency) {
    */
   public Amount value(Long value) {
     this.value = value;
+    isSetValue = true; // mark as set
     return this;
   }
 
@@ -104,6 +121,27 @@ public Long getValue() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setValue(Long value) {
     this.value = value;
+    isSetValue = true; // mark as set
+  }
+
+  /**
+   * Configures whether null values are explicitly serialized in the JSON payload. Default is false.
+   */
+  public Amount includeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
+    return this;
+  }
+
+  /** Returns whether null values are explicitly serialized in the JSON payload. */
+  public boolean isIncludeNullValues() {
+    return includeNullValues;
+  }
+
+  /**
+   * Sets whether null values should be explicitly serialized in the JSON payload. Default is false.
+   */
+  public void setIncludeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
   }
 
   /** Return true if this Amount object is equal to o. */
@@ -117,12 +155,14 @@ public boolean equals(Object o) {
     }
     Amount amount = (Amount) o;
     return Objects.equals(this.currency, amount.currency)
-        && Objects.equals(this.value, amount.value);
+        && Objects.equals(this.isSetCurrency, amount.isSetCurrency)
+        && Objects.equals(this.value, amount.value)
+        && Objects.equals(this.isSetValue, amount.isSetValue);
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(currency, value);
+    return Objects.hash(currency, isSetCurrency, value, isSetValue);
   }
 
   @Override
@@ -145,6 +185,33 @@ private String toIndentedString(Object o) {
     return o.toString().replace("\n", "\n    ");
   }
 
+  /** Returns a map of properties to be merged into the JSON payload as explicit null values. */
+  @JsonInclude(JsonInclude.Include.ALWAYS)
+  @JsonAnyGetter
+  public Map<String, Object> getExplicitNulls() {
+    if (!this.includeNullValues) {
+      return Collections.emptyMap();
+    }
+
+    Map<String, Object> nulls = new HashMap<>();
+
+    if (isSetCurrency) {
+      addIfNull(nulls, JSON_PROPERTY_CURRENCY, this.currency);
+    }
+    if (isSetValue) {
+      addIfNull(nulls, JSON_PROPERTY_VALUE, this.value);
+    }
+
+    return nulls;
+  }
+
+  // add to map when value is null
+  private void addIfNull(Map<String, Object> map, String key, Object value) {
+    if (value == null) {
+      map.put(key, null);
+    }
+  }
+
   /**
    * Create an instance of Amount given an JSON string
    *
diff --git a/src/main/java/com/adyen/model/balancecontrol/BalanceTransferRequest.java b/src/main/java/com/adyen/model/balancecontrol/BalanceTransferRequest.java
index a4b8feb0b..7f48b42b3 100644
--- a/src/main/java/com/adyen/model/balancecontrol/BalanceTransferRequest.java
+++ b/src/main/java/com/adyen/model/balancecontrol/BalanceTransferRequest.java
@@ -11,7 +11,9 @@
 
 package com.adyen.model.balancecontrol;
 
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -34,18 +36,33 @@ public class BalanceTransferRequest {
   public static final String JSON_PROPERTY_AMOUNT = "amount";
   private Amount amount;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetAmount = false;
+
   public static final String JSON_PROPERTY_DESCRIPTION = "description";
   private String description;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetDescription = false;
+
   public static final String JSON_PROPERTY_FROM_MERCHANT = "fromMerchant";
   private String fromMerchant;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetFromMerchant = false;
+
   public static final String JSON_PROPERTY_REFERENCE = "reference";
   private String reference;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetReference = false;
+
   public static final String JSON_PROPERTY_TO_MERCHANT = "toMerchant";
   private String toMerchant;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetToMerchant = false;
+
   /**
    * The type of balance transfer. Possible values: **tax**, **fee**, **terminalSale**, **credit**,
    * **debit**, and **adjustment**.
@@ -101,6 +118,15 @@ public static TypeEnum fromValue(String value) {
   public static final String JSON_PROPERTY_TYPE = "type";
   private TypeEnum type;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetType = false;
+
+  /**
+   * Sets whether attributes with null values should be explicitly included in the JSON payload.
+   * Default is false.
+   */
+  @JsonIgnore private boolean includeNullValues = false;
+
   public BalanceTransferRequest() {}
 
   /**
@@ -111,6 +137,7 @@ public BalanceTransferRequest() {}
    */
   public BalanceTransferRequest amount(Amount amount) {
     this.amount = amount;
+    isSetAmount = true; // mark as set
     return this;
   }
 
@@ -134,6 +161,7 @@ public Amount getAmount() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAmount(Amount amount) {
     this.amount = amount;
+    isSetAmount = true; // mark as set
   }
 
   /**
@@ -147,6 +175,7 @@ public void setAmount(Amount amount) {
    */
   public BalanceTransferRequest description(String description) {
     this.description = description;
+    isSetDescription = true; // mark as set
     return this;
   }
 
@@ -176,6 +205,7 @@ public String getDescription() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDescription(String description) {
     this.description = description;
+    isSetDescription = true; // mark as set
   }
 
   /**
@@ -187,6 +217,7 @@ public void setDescription(String description) {
    */
   public BalanceTransferRequest fromMerchant(String fromMerchant) {
     this.fromMerchant = fromMerchant;
+    isSetFromMerchant = true; // mark as set
     return this;
   }
 
@@ -212,6 +243,7 @@ public String getFromMerchant() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFromMerchant(String fromMerchant) {
     this.fromMerchant = fromMerchant;
+    isSetFromMerchant = true; // mark as set
   }
 
   /**
@@ -224,6 +256,7 @@ public void setFromMerchant(String fromMerchant) {
    */
   public BalanceTransferRequest reference(String reference) {
     this.reference = reference;
+    isSetReference = true; // mark as set
     return this;
   }
 
@@ -251,6 +284,7 @@ public String getReference() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReference(String reference) {
     this.reference = reference;
+    isSetReference = true; // mark as set
   }
 
   /**
@@ -262,6 +296,7 @@ public void setReference(String reference) {
    */
   public BalanceTransferRequest toMerchant(String toMerchant) {
     this.toMerchant = toMerchant;
+    isSetToMerchant = true; // mark as set
     return this;
   }
 
@@ -287,6 +322,7 @@ public String getToMerchant() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setToMerchant(String toMerchant) {
     this.toMerchant = toMerchant;
+    isSetToMerchant = true; // mark as set
   }
 
   /**
@@ -299,6 +335,7 @@ public void setToMerchant(String toMerchant) {
    */
   public BalanceTransferRequest type(TypeEnum type) {
     this.type = type;
+    isSetType = true; // mark as set
     return this;
   }
 
@@ -326,6 +363,27 @@ public TypeEnum getType() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(TypeEnum type) {
     this.type = type;
+    isSetType = true; // mark as set
+  }
+
+  /**
+   * Configures whether null values are explicitly serialized in the JSON payload. Default is false.
+   */
+  public BalanceTransferRequest includeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
+    return this;
+  }
+
+  /** Returns whether null values are explicitly serialized in the JSON payload. */
+  public boolean isIncludeNullValues() {
+    return includeNullValues;
+  }
+
+  /**
+   * Sets whether null values should be explicitly serialized in the JSON payload. Default is false.
+   */
+  public void setIncludeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
   }
 
   /** Return true if this BalanceTransferRequest object is equal to o. */
@@ -339,16 +397,34 @@ public boolean equals(Object o) {
     }
     BalanceTransferRequest balanceTransferRequest = (BalanceTransferRequest) o;
     return Objects.equals(this.amount, balanceTransferRequest.amount)
+        && Objects.equals(this.isSetAmount, balanceTransferRequest.isSetAmount)
         && Objects.equals(this.description, balanceTransferRequest.description)
+        && Objects.equals(this.isSetDescription, balanceTransferRequest.isSetDescription)
         && Objects.equals(this.fromMerchant, balanceTransferRequest.fromMerchant)
+        && Objects.equals(this.isSetFromMerchant, balanceTransferRequest.isSetFromMerchant)
         && Objects.equals(this.reference, balanceTransferRequest.reference)
+        && Objects.equals(this.isSetReference, balanceTransferRequest.isSetReference)
         && Objects.equals(this.toMerchant, balanceTransferRequest.toMerchant)
-        && Objects.equals(this.type, balanceTransferRequest.type);
+        && Objects.equals(this.isSetToMerchant, balanceTransferRequest.isSetToMerchant)
+        && Objects.equals(this.type, balanceTransferRequest.type)
+        && Objects.equals(this.isSetType, balanceTransferRequest.isSetType);
   }
 
   @Override
   public int hashCode() {
-    return Objects.hash(amount, description, fromMerchant, reference, toMerchant, type);
+    return Objects.hash(
+        amount,
+        isSetAmount,
+        description,
+        isSetDescription,
+        fromMerchant,
+        isSetFromMerchant,
+        reference,
+        isSetReference,
+        toMerchant,
+        isSetToMerchant,
+        type,
+        isSetType);
   }
 
   @Override
@@ -375,6 +451,45 @@ private String toIndentedString(Object o) {
     return o.toString().replace("\n", "\n    ");
   }
 
+  /** Returns a map of properties to be merged into the JSON payload as explicit null values. */
+  @JsonInclude(JsonInclude.Include.ALWAYS)
+  @JsonAnyGetter
+  public Map<String, Object> getExplicitNulls() {
+    if (!this.includeNullValues) {
+      return Collections.emptyMap();
+    }
+
+    Map<String, Object> nulls = new HashMap<>();
+
+    if (isSetAmount) {
+      addIfNull(nulls, JSON_PROPERTY_AMOUNT, this.amount);
+    }
+    if (isSetDescription) {
+      addIfNull(nulls, JSON_PROPERTY_DESCRIPTION, this.description);
+    }
+    if (isSetFromMerchant) {
+      addIfNull(nulls, JSON_PROPERTY_FROM_MERCHANT, this.fromMerchant);
+    }
+    if (isSetReference) {
+      addIfNull(nulls, JSON_PROPERTY_REFERENCE, this.reference);
+    }
+    if (isSetToMerchant) {
+      addIfNull(nulls, JSON_PROPERTY_TO_MERCHANT, this.toMerchant);
+    }
+    if (isSetType) {
+      addIfNull(nulls, JSON_PROPERTY_TYPE, this.type);
+    }
+
+    return nulls;
+  }
+
+  // add to map when value is null
+  private void addIfNull(Map<String, Object> map, String key, Object value) {
+    if (value == null) {
+      map.put(key, null);
+    }
+  }
+
   /**
    * Create an instance of BalanceTransferRequest given an JSON string
    *
diff --git a/src/main/java/com/adyen/model/balancecontrol/BalanceTransferResponse.java b/src/main/java/com/adyen/model/balancecontrol/BalanceTransferResponse.java
index e4922ef8a..417920aaf 100644
--- a/src/main/java/com/adyen/model/balancecontrol/BalanceTransferResponse.java
+++ b/src/main/java/com/adyen/model/balancecontrol/BalanceTransferResponse.java
@@ -11,7 +11,9 @@
 
 package com.adyen.model.balancecontrol;
 
+import com.fasterxml.jackson.annotation.JsonAnyGetter;
 import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
@@ -38,21 +40,39 @@ public class BalanceTransferResponse {
   public static final String JSON_PROPERTY_AMOUNT = "amount";
   private Amount amount;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetAmount = false;
+
   public static final String JSON_PROPERTY_CREATED_AT = "createdAt";
   private OffsetDateTime createdAt;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetCreatedAt = false;
+
   public static final String JSON_PROPERTY_DESCRIPTION = "description";
   private String description;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetDescription = false;
+
   public static final String JSON_PROPERTY_FROM_MERCHANT = "fromMerchant";
   private String fromMerchant;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetFromMerchant = false;
+
   public static final String JSON_PROPERTY_PSP_REFERENCE = "pspReference";
   private String pspReference;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetPspReference = false;
+
   public static final String JSON_PROPERTY_REFERENCE = "reference";
   private String reference;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetReference = false;
+
   /**
    * The status of the balance transfer. Possible values: **transferred**, **failed**, **error**,
    * and **notEnoughBalance**.
@@ -104,9 +124,15 @@ public static StatusEnum fromValue(String value) {
   public static final String JSON_PROPERTY_STATUS = "status";
   private StatusEnum status;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetStatus = false;
+
   public static final String JSON_PROPERTY_TO_MERCHANT = "toMerchant";
   private String toMerchant;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetToMerchant = false;
+
   /**
    * The type of balance transfer. Possible values: **tax**, **fee**, **terminalSale**, **credit**,
    * **debit**, and **adjustment**.
@@ -162,6 +188,15 @@ public static TypeEnum fromValue(String value) {
   public static final String JSON_PROPERTY_TYPE = "type";
   private TypeEnum type;
 
+  /** Mark when the attribute has been explicitly set. */
+  private boolean isSetType = false;
+
+  /**
+   * Sets whether attributes with null values should be explicitly included in the JSON payload.
+   * Default is false.
+   */
+  @JsonIgnore private boolean includeNullValues = false;
+
   public BalanceTransferResponse() {}
 
   /**
@@ -172,6 +207,7 @@ public BalanceTransferResponse() {}
    */
   public BalanceTransferResponse amount(Amount amount) {
     this.amount = amount;
+    isSetAmount = true; // mark as set
     return this;
   }
 
@@ -195,6 +231,7 @@ public Amount getAmount() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setAmount(Amount amount) {
     this.amount = amount;
+    isSetAmount = true; // mark as set
   }
 
   /**
@@ -205,6 +242,7 @@ public void setAmount(Amount amount) {
    */
   public BalanceTransferResponse createdAt(OffsetDateTime createdAt) {
     this.createdAt = createdAt;
+    isSetCreatedAt = true; // mark as set
     return this;
   }
 
@@ -228,6 +266,7 @@ public OffsetDateTime getCreatedAt() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setCreatedAt(OffsetDateTime createdAt) {
     this.createdAt = createdAt;
+    isSetCreatedAt = true; // mark as set
   }
 
   /**
@@ -241,6 +280,7 @@ public void setCreatedAt(OffsetDateTime createdAt) {
    */
   public BalanceTransferResponse description(String description) {
     this.description = description;
+    isSetDescription = true; // mark as set
     return this;
   }
 
@@ -270,6 +310,7 @@ public String getDescription() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setDescription(String description) {
     this.description = description;
+    isSetDescription = true; // mark as set
   }
 
   /**
@@ -281,6 +322,7 @@ public void setDescription(String description) {
    */
   public BalanceTransferResponse fromMerchant(String fromMerchant) {
     this.fromMerchant = fromMerchant;
+    isSetFromMerchant = true; // mark as set
     return this;
   }
 
@@ -306,6 +348,7 @@ public String getFromMerchant() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setFromMerchant(String fromMerchant) {
     this.fromMerchant = fromMerchant;
+    isSetFromMerchant = true; // mark as set
   }
 
   /**
@@ -317,6 +360,7 @@ public void setFromMerchant(String fromMerchant) {
    */
   public BalanceTransferResponse pspReference(String pspReference) {
     this.pspReference = pspReference;
+    isSetPspReference = true; // mark as set
     return this;
   }
 
@@ -342,6 +386,7 @@ public String getPspReference() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setPspReference(String pspReference) {
     this.pspReference = pspReference;
+    isSetPspReference = true; // mark as set
   }
 
   /**
@@ -354,6 +399,7 @@ public void setPspReference(String pspReference) {
    */
   public BalanceTransferResponse reference(String reference) {
     this.reference = reference;
+    isSetReference = true; // mark as set
     return this;
   }
 
@@ -381,6 +427,7 @@ public String getReference() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setReference(String reference) {
     this.reference = reference;
+    isSetReference = true; // mark as set
   }
 
   /**
@@ -393,6 +440,7 @@ public void setReference(String reference) {
    */
   public BalanceTransferResponse status(StatusEnum status) {
     this.status = status;
+    isSetStatus = true; // mark as set
     return this;
   }
 
@@ -420,6 +468,7 @@ public StatusEnum getStatus() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setStatus(StatusEnum status) {
     this.status = status;
+    isSetStatus = true; // mark as set
   }
 
   /**
@@ -431,6 +480,7 @@ public void setStatus(StatusEnum status) {
    */
   public BalanceTransferResponse toMerchant(String toMerchant) {
     this.toMerchant = toMerchant;
+    isSetToMerchant = true; // mark as set
     return this;
   }
 
@@ -456,6 +506,7 @@ public String getToMerchant() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setToMerchant(String toMerchant) {
     this.toMerchant = toMerchant;
+    isSetToMerchant = true; // mark as set
   }
 
   /**
@@ -468,6 +519,7 @@ public void setToMerchant(String toMerchant) {
    */
   public BalanceTransferResponse type(TypeEnum type) {
     this.type = type;
+    isSetType = true; // mark as set
     return this;
   }
 
@@ -495,6 +547,27 @@ public TypeEnum getType() {
   @JsonInclude(value = JsonInclude.Include.USE_DEFAULTS)
   public void setType(TypeEnum type) {
     this.type = type;
+    isSetType = true; // mark as set
+  }
+
+  /**
+   * Configures whether null values are explicitly serialized in the JSON payload. Default is false.
+   */
+  public BalanceTransferResponse includeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
+    return this;
+  }
+
+  /** Returns whether null values are explicitly serialized in the JSON payload. */
+  public boolean isIncludeNullValues() {
+    return includeNullValues;
+  }
+
+  /**
+   * Sets whether null values should be explicitly serialized in the JSON payload. Default is false.
+   */
+  public void setIncludeNullValues(boolean includeNullValues) {
+    this.includeNullValues = includeNullValues;
   }
 
   /** Return true if this BalanceTransferResponse object is equal to o. */
@@ -508,28 +581,46 @@ public boolean equals(Object o) {
     }
     BalanceTransferResponse balanceTransferResponse = (BalanceTransferResponse) o;
     return Objects.equals(this.amount, balanceTransferResponse.amount)
+        && Objects.equals(this.isSetAmount, balanceTransferResponse.isSetAmount)
         && Objects.equals(this.createdAt, balanceTransferResponse.createdAt)
+        && Objects.equals(this.isSetCreatedAt, balanceTransferResponse.isSetCreatedAt)
         && Objects.equals(this.description, balanceTransferResponse.description)
+        && Objects.equals(this.isSetDescription, balanceTransferResponse.isSetDescription)
         && Objects.equals(this.fromMerchant, balanceTransferResponse.fromMerchant)
+        && Objects.equals(this.isSetFromMerchant, balanceTransferResponse.isSetFromMerchant)
         && Objects.equals(this.pspReference, balanceTransferResponse.pspReference)
+        && Objects.equals(this.isSetPspReference, balanceTransferResponse.isSetPspReference)
         && Objects.equals(this.reference, balanceTransferResponse.reference)
+        && Objects.equals(this.isSetReference, balanceTransferResponse.isSetReference)
         && Objects.equals(this.status, balanceTransferResponse.status)
+        && Objects.equals(this.isSetStatus, balanceTransferResponse.isSetStatus)
         && Objects.equals(this.toMerchant, balanceTransferResponse.toMerchant)
-        && Objects.equals(this.type, balanceTransferResponse.type);
+        && Objects.equals(this.isSetToMerchant, balanceTransferResponse.isSetToMerchant)
+        && Objects.equals(this.type, balanceTransferResponse.type)
+        && Objects.equals(this.isSetType, balanceTransferResponse.isSetType);
   }
 
   @Override
   public int hashCode() {
     return Objects.hash(
         amount,
+        isSetAmount,
         createdAt,
+        isSetCreatedAt,
         description,
+        isSetDescription,
         fromMerchant,
+        isSetFromMerchant,
         pspReference,
+        isSetPspReference,
         reference,
+        isSetReference,
         status,
+        isSetStatus,
         toMerchant,
-        type);
+        isSetToMerchant,
+        type,
+        isSetType);
   }
 
   @Override
@@ -559,6 +650,54 @@ private String toIndentedString(Object o) {
     return o.toString().replace("\n", "\n    ");
   }
 
+  /** Returns a map of properties to be merged into the JSON payload as explicit null values. */
+  @JsonInclude(JsonInclude.Include.ALWAYS)
+  @JsonAnyGetter
+  public Map<String, Object> getExplicitNulls() {
+    if (!this.includeNullValues) {
+      return Collections.emptyMap();
+    }
+
+    Map<String, Object> nulls = new HashMap<>();
+
+    if (isSetAmount) {
+      addIfNull(nulls, JSON_PROPERTY_AMOUNT, this.amount);
+    }
+    if (isSetCreatedAt) {
+      addIfNull(nulls, JSON_PROPERTY_CREATED_AT, this.createdAt);
+    }
+    if (isSetDescription) {
+      addIfNull(nulls, JSON_PROPERTY_DESCRIPTION, this.description);
+    }
+    if (isSetFromMerchant) {
+      addIfNull(nulls, JSON_PROPERTY_FROM_MERCHANT, this.fromMerchant);
+    }
+    if (isSetPspReference) {
+      addIfNull(nulls, JSON_PROPERTY_PSP_REFERENCE, this.pspReference);
+    }
+    if (isSetReference) {
+      addIfNull(nulls, JSON_PROPERTY_REFERENCE, this.reference);
+    }
+    if (isSetStatus) {
+      addIfNull(nulls, JSON_PROPERTY_STATUS, this.status);
+    }
+    if (isSetToMerchant) {
+      addIfNull(nulls, JSON_PROPERTY_TO_MERCHANT, this.toMerchant);
+    }
+    if (isSetType) {
+      addIfNull(nulls, JSON_PROPERTY_TYPE, this.type);
+    }
+
+    return nulls;
+  }
+
+  // add to map when value is null
+  private void addIfNull(Map<String, Object> map, String key, Object value) {
+    if (value == null) {
+      map.put(key, null);
+    }
+  }
+
   /**
    * Create an instance of BalanceTransferResponse given an JSON string
    *
diff --git a/src/test/java/com/adyen/CheckoutTest.java b/src/test/java/com/adyen/CheckoutTest.java
index b81e95531..396880cdc 100644
--- a/src/test/java/com/adyen/CheckoutTest.java
+++ b/src/test/java/com/adyen/CheckoutTest.java
@@ -889,7 +889,7 @@ public void testForwardCardDetails() throws Exception {
 
     CheckoutForwardResponse response = recurringApi.forward(checkoutForwardRequest);
 
-	  assertNull(response.getStoredPaymentMethodId());  // card is not tokenized
+    assertNull(response.getStoredPaymentMethodId()); // card is not tokenized
     assertNotNull(response.getResponse());
     assertEquals(200, (int) response.getResponse().getStatus());
     assertTrue(response.getResponse().getBody().contains("PAYMENT_METHOD_ID"));