diff --git a/CHANGELOG.md b/CHANGELOG.md
index baaf16e3..c56452c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,46 @@
+### v3.26.0 (2024-03-20)
+* * *
+
+#### New resources:
+* Attribute has been added.
+* ImpactedItemPrice has been added.
+* InstallmentConfig has been added.
+* Installment has been added.
+
+#### Removed attributes:
+* product_id has been removed from ItemPrice resource.
+
+#### New Enum values:
+* klarna_pay_now has been added to TypeEnum in Customer resource.
+* klarna_pay_now has been added to PaymentMethodEnum.
+* klarna_pay_now has been added to PaymentMethodTypeEnum enum.
+* klarna_pay_now has been added to TypeEnum.
+* price_variant has been added to EntityTypeEnum.
+* price_variant_created has been added in EventType enum.
+* price_variant_updated has been added in EventType enum.
+* price_variant_deleted has been added in EventType enum.
+
+#### Removed Enum values:
+* product and variant have been removed from EntityTypeEnum.
+
+#### New Input parameters:
+* config_id has been added to Invoice#InstallmentsRequest.
+* amount has been added to Invoice#InstallmentsRequest.
+* payment_source_id has been added to Purchase#CreateRequest.
+* installment_info[config_id] has been added to Purchase#CreateRequest.
+* installment_info[amount] has been added to Purchase#CreateRequest.
+* subscription_info[contract_term_billing_cycle_on_renewal] has been added to Purchase#CreateRequest.
+* contract_terms[index] has been added to Purchase#CreateRequest.
+* contract_terms[action_at_term_end] has been added to Purchase#CreateRequest.
+* contract_terms[cancellation_cutoff_period] has been added to Purchase#CreateRequest.
+* subscription_info[contract_term_billing_cycle_on_renewal] has been added to Purchase#EstimateRequest.
+* contract_terms[index] has been added to Purchase#EstimateRequest.
+* contract_terms[action_at_term_end] has been added to Purchase#EstimateRequest.
+* contract_terms[cancellation_cutoff_period] has been added to Purchase#EstimateRequest.
+
+#### Deprecated input parameters:
+* product_created, product_updated, product_deleted, variant_created, variant_updated, variant_deleted has been deprecated in EventTypeEnum.
+
 ### v3.25.1 (2024-03-06)
 * * *
 * NonSubscription has been added.
diff --git a/lib/ChargeBee/Models/Attribute.php b/lib/ChargeBee/Models/Attribute.php
new file mode 100644
index 00000000..24dc2fa0
--- /dev/null
+++ b/lib/ChargeBee/Models/Attribute.php
@@ -0,0 +1,24 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+use ChargeBee\ChargeBee\Request;
+use ChargeBee\ChargeBee\Util;
+
+class Attribute extends Model
+{
+
+  protected $allowed = [
+    'name',
+    'value',
+  ];
+
+
+
+  # OPERATIONS
+  #-----------
+
+ }
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/ImpactedItemPrice.php b/lib/ChargeBee/Models/ImpactedItemPrice.php
new file mode 100644
index 00000000..d36aa669
--- /dev/null
+++ b/lib/ChargeBee/Models/ImpactedItemPrice.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+use ChargeBee\ChargeBee\Request;
+use ChargeBee\ChargeBee\Util;
+
+class ImpactedItemPrice extends Model
+{
+
+  protected $allowed = [
+    'count',
+    'download',
+    'itemPrices',
+  ];
+
+
+
+  # OPERATIONS
+  #-----------
+
+ }
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/ImpactedItemPriceDownload.php b/lib/ChargeBee/Models/ImpactedItemPriceDownload.php
new file mode 100644
index 00000000..57137b62
--- /dev/null
+++ b/lib/ChargeBee/Models/ImpactedItemPriceDownload.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+
+class ImpactedItemPriceDownload extends Model
+{
+  protected $allowed = [
+    'downloadUrl',
+    'validTill',
+    'mimeType',
+  ];
+
+}
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/Installment.php b/lib/ChargeBee/Models/Installment.php
new file mode 100644
index 00000000..77201a2e
--- /dev/null
+++ b/lib/ChargeBee/Models/Installment.php
@@ -0,0 +1,39 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+use ChargeBee\ChargeBee\Request;
+use ChargeBee\ChargeBee\Util;
+
+class Installment extends Model
+{
+
+  protected $allowed = [
+    'id',
+    'invoiceId',
+    'date',
+    'amount',
+    'status',
+    'createdAt',
+    'updatedAt',
+  ];
+
+
+
+  # OPERATIONS
+  #-----------
+
+  public static function retrieve($id, $env = null, $headers = array())
+  {
+    return Request::send(Request::GET, Util::encodeURIPath("installments",$id), array(), $env, $headers);
+  }
+
+  public static function all($params, $env = null, $headers = array())
+  {
+    return Request::sendListRequest(Request::GET, Util::encodeURIPath("installments"), $params, $env, $headers);
+  }
+
+ }
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/InstallmentConfig.php b/lib/ChargeBee/Models/InstallmentConfig.php
new file mode 100644
index 00000000..0984e3da
--- /dev/null
+++ b/lib/ChargeBee/Models/InstallmentConfig.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+use ChargeBee\ChargeBee\Request;
+use ChargeBee\ChargeBee\Util;
+
+class InstallmentConfig extends Model
+{
+
+  protected $allowed = [
+    'id',
+    'description',
+    'numberOfInstallments',
+    'periodUnit',
+    'period',
+    'preferredDay',
+    'createdAt',
+    'updatedAt',
+    'installments',
+  ];
+
+
+
+  # OPERATIONS
+  #-----------
+
+  public static function create($params, $env = null, $headers = array())
+  {
+    return Request::send(Request::POST, Util::encodeURIPath("installment_configs"), $params, $env, $headers);
+  }
+
+  public static function retrieve($id, $env = null, $headers = array())
+  {
+    return Request::send(Request::GET, Util::encodeURIPath("installment_configs",$id), array(), $env, $headers);
+  }
+
+  public static function delete($id, $env = null, $headers = array())
+  {
+    return Request::send(Request::POST, Util::encodeURIPath("installment_configs",$id,"delete"), array(), $env, $headers);
+  }
+
+ }
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/InstallmentConfigInstallment.php b/lib/ChargeBee/Models/InstallmentConfigInstallment.php
new file mode 100644
index 00000000..af54eee2
--- /dev/null
+++ b/lib/ChargeBee/Models/InstallmentConfigInstallment.php
@@ -0,0 +1,16 @@
+<?php
+
+namespace ChargeBee\ChargeBee\Models;
+
+use ChargeBee\ChargeBee\Model;
+
+class InstallmentConfigInstallment extends Model
+{
+  protected $allowed = [
+    'period',
+    'amountPercentage',
+  ];
+
+}
+
+?>
\ No newline at end of file
diff --git a/lib/ChargeBee/Models/Invoice.php b/lib/ChargeBee/Models/Invoice.php
index 1ee3830e..2dcb6daf 100644
--- a/lib/ChargeBee/Models/Invoice.php
+++ b/lib/ChargeBee/Models/Invoice.php
@@ -251,6 +251,11 @@ public static function updateDetails($id, $params = array(), $env = null, $heade
     return Request::send(Request::POST, Util::encodeURIPath("invoices",$id,"update_details"), $params, $env, $headers);
   }
 
+  public static function installments($id, $params, $env = null, $headers = array())
+  {
+    return Request::send(Request::POST, Util::encodeURIPath("invoices",$id,"installments"), $params, $env, $headers);
+  }
+
   public static function resendEinvoice($id, $env = null, $headers = array())
   {
     return Request::send(Request::POST, Util::encodeURIPath("invoices",$id,"resend_einvoice"), array(), $env, $headers);
diff --git a/lib/ChargeBee/Models/ItemPrice.php b/lib/ChargeBee/Models/ItemPrice.php
index ec2591c4..4ed1a55d 100644
--- a/lib/ChargeBee/Models/ItemPrice.php
+++ b/lib/ChargeBee/Models/ItemPrice.php
@@ -13,7 +13,6 @@ class ItemPrice extends Model
     'id',
     'name',
     'itemFamilyId',
-    'productId',
     'itemId',
     'description',
     'status',
diff --git a/lib/ChargeBee/Result.php b/lib/ChargeBee/Result.php
index f1dadc82..3a6cf14f 100644
--- a/lib/ChargeBee/Result.php
+++ b/lib/ChargeBee/Result.php
@@ -525,6 +525,12 @@ public function item()
         return $item;
     }
 
+    public function attribute() 
+    {
+        $attribute = $this->_get('attribute', Models\Attribute::class);
+        return $attribute;
+    }
+
     public function itemPrice() 
     {
         $item_price = $this->_get('item_price', Models\ItemPrice::class, 
@@ -542,7 +548,6 @@ public function attachedItem()
         return $attached_item;
     }
 
-
     public function differentialPrice() 
     {
         $differential_price = $this->_get('differential_price', Models\DifferentialPrice::class, 
@@ -580,6 +585,15 @@ public function impactedItem()
         return $impacted_item;
     }
 
+    public function impactedItemPrice() 
+    {
+        $impacted_item_price = $this->_get('impacted_item_price', Models\ImpactedItemPrice::class, 
+        array( 
+			'download' => Models\ImpactedItemPriceDownload::class
+		));
+        return $impacted_item_price;
+    }
+
     public function subscriptionEntitlement() 
     {
         $subscription_entitlement = $this->_get('subscription_entitlement', Models\SubscriptionEntitlement::class, 
@@ -634,6 +648,21 @@ public function paymentVoucher()
         return $payment_voucher;
     }
 
+    public function installmentConfig() 
+    {
+        $installment_config = $this->_get('installment_config', Models\InstallmentConfig::class, 
+        array( 
+			'installments' => Models\InstallmentConfigInstallment::class
+		));
+        return $installment_config;
+    }
+
+    public function installment() 
+    {
+        $installment = $this->_get('installment', Models\Installment::class);
+        return $installment;
+    }
+
     public function advanceInvoiceSchedules()
     {
         $advance_invoice_schedules = $this->_getList('advance_invoice_schedules', Models\AdvanceInvoiceSchedule::class,
diff --git a/lib/ChargeBee/Version.php b/lib/ChargeBee/Version.php
index a1a23af8..a105098b 100644
--- a/lib/ChargeBee/Version.php
+++ b/lib/ChargeBee/Version.php
@@ -4,7 +4,7 @@
 
 final class Version
 {
-	  const VERSION = '3.25.1';
+	  const VERSION = '3.26.0';
 }
 
 ?>
diff --git a/lib/init.php b/lib/init.php
index 3b155748..bd945e52 100644
--- a/lib/init.php
+++ b/lib/init.php
@@ -28,6 +28,7 @@
 require(dirname(__FILE__) . '/ChargeBee/Models/AdvanceInvoiceScheduleFixedIntervalSchedule.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/AdvanceInvoiceScheduleSpecificDatesSchedule.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/AttachedItem.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/Attribute.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/Card.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/Comment.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/Contact.php');
@@ -90,9 +91,14 @@
 require(dirname(__FILE__) . '/ChargeBee/Models/HostedPage.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedItem.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedItemDownload.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedItemPrice.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedItemPriceDownload.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedSubscription.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/ImpactedSubscriptionDownload.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/InAppSubscription.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/Installment.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/InstallmentConfig.php');
+require(dirname(__FILE__) . '/ChargeBee/Models/InstallmentConfigInstallment.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/Invoice.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/InvoiceAdjustmentCreditNote.php');
 require(dirname(__FILE__) . '/ChargeBee/Models/InvoiceAppliedCredit.php');