diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ae1d0b..b9b815c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,25 @@
+### v2.66.0 (2025-12-30)
+* * * 
+
+### New Attributes: 
+* retry_engine has been added to Invoice#DunningAttempt.
+
+### New Endpoint: 
+* move action has been added to ItemPrice.
+
+### New Parameters: 
+* exclude_tax_type has been added to Estimate#RenewalEstimateInputParam.
+* variant_id has been added to ItemPrice#MoveInputParam.
+* custom has been added to PricingPageSession#CreateForNewSubscriptionInputParam.
+* custom has been added to PricingPageSession#CreateForExistingSubscriptionInputParam.
+
+### New Enums: 
+* ELECTRONIC_PAYMENT_STANDARD has been added to PaymentMethodTypeEnum.
+* KBC_PAYMENT_BUTTON has been added to PaymentMethodTypeEnum.
+* PAY_BY_BANK has been added to PaymentMethodTypeEnum.
+* TRUSTLY has been added to PaymentMethodTypeEnum.
+* STABLECOIN has been added to PaymentMethodTypeEnum.
+
 ### v2.65.0 (2025-11-26)
 * * * 
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 9f9accd..2861986 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    chargebee (2.65.0)
+    chargebee (2.66.0)
       cgi (>= 0.1.0, < 1.0.0)
 
 GEM
diff --git a/chargebee.gemspec b/chargebee.gemspec
index 3767f61..3fb0f3d 100644
--- a/chargebee.gemspec
+++ b/chargebee.gemspec
@@ -4,8 +4,8 @@ Gem::Specification.new do |s|
   s.rubygems_version = '1.3.5'
   s.required_ruby_version = '>= 1.9.3'
   s.name              = 'chargebee'
-  s.version           = '2.65.0'
-  s.date              = '2025-11-26'
+  s.version           = '2.66.0'
+  s.date              = '2025-12-30'
   s.summary     = "Ruby client for Chargebee API."
   s.description = "Subscription Billing - Simple. Secure. Affordable. More details at www.chargebee.com."
   s.metadata = {
diff --git a/lib/chargebee.rb b/lib/chargebee.rb
index d4f90cf..6b73e5b 100644
--- a/lib/chargebee.rb
+++ b/lib/chargebee.rb
@@ -100,7 +100,7 @@
 
 module ChargeBee
 
-  VERSION = '2.65.0'
+  VERSION = '2.66.0'
 
   @@default_env = nil
   @@verify_ca_certs = true
diff --git a/lib/chargebee/models/coupon_code.rb b/lib/chargebee/models/coupon_code.rb
index f5091a1..3fc035d 100644
--- a/lib/chargebee/models/coupon_code.rb
+++ b/lib/chargebee/models/coupon_code.rb
@@ -6,6 +6,7 @@ class CouponCode < Model
   # OPERATIONS
   #-----------
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.create(params, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/credit_note.rb b/lib/chargebee/models/credit_note.rb
index daf1e02..7cd9895 100644
--- a/lib/chargebee/models/credit_note.rb
+++ b/lib/chargebee/models/credit_note.rb
@@ -135,6 +135,7 @@ def self.list(params={}, env=nil, headers={})
     Request.send_list_request('get', uri_path("credit_notes"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.credit_notes_for_customer(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/customer.rb b/lib/chargebee/models/customer.rb
index d2de515..40dcbb3 100644
--- a/lib/chargebee/models/customer.rb
+++ b/lib/chargebee/models/customer.rb
@@ -157,6 +157,7 @@ def self.delete_contact(id, params, env=nil, headers={})
     Request.send('post', uri_path("customers",id.to_s,"delete_contact"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.add_promotional_credits(id, params, env=nil, headers={})
     jsonKeys = { 
     }
@@ -166,6 +167,7 @@ def self.add_promotional_credits(id, params, env=nil, headers={})
     Request.send('post', uri_path("customers",id.to_s,"add_promotional_credits"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.deduct_promotional_credits(id, params, env=nil, headers={})
     jsonKeys = { 
     }
@@ -175,6 +177,7 @@ def self.deduct_promotional_credits(id, params, env=nil, headers={})
     Request.send('post', uri_path("customers",id.to_s,"deduct_promotional_credits"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.set_promotional_credits(id, params, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/hosted_page.rb b/lib/chargebee/models/hosted_page.rb
index 5523df1..326392b 100644
--- a/lib/chargebee/models/hosted_page.rb
+++ b/lib/chargebee/models/hosted_page.rb
@@ -72,6 +72,7 @@ def self.checkout_existing_for_items(params, env=nil, headers={})
     Request.send('post', uri_path("hosted_pages","checkout_existing_for_items"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.update_card(params, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/invoice.rb b/lib/chargebee/models/invoice.rb
index e56d7de..0bb5104 100644
--- a/lib/chargebee/models/invoice.rb
+++ b/lib/chargebee/models/invoice.rb
@@ -46,7 +46,7 @@ class ReferenceTransaction < Model
     end
 
     class DunningAttempt < Model
-      attr_accessor :attempt, :transaction_id, :dunning_type, :created_at, :txn_status, :txn_amount
+      attr_accessor :attempt, :transaction_id, :dunning_type, :created_at, :txn_status, :txn_amount, :retry_engine
     end
 
     class AppliedCredit < Model
@@ -145,6 +145,7 @@ def self.charge_addon(params, env=nil, headers={})
     Request.send('post', uri_path("invoices","charge_addon"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.create_for_charge_item(params, env=nil, headers={})
     jsonKeys = { 
     }
@@ -233,6 +234,7 @@ def self.list(params={}, env=nil, headers={})
     Request.send_list_request('get', uri_path("invoices"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.invoices_for_customer(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
@@ -240,6 +242,7 @@ def self.invoices_for_customer(id, params={}, env=nil, headers={})
     Request.send('get', uri_path("customers",id.to_s,"invoices"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.invoices_for_subscription(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/item_price.rb b/lib/chargebee/models/item_price.rb
index afddccf..15eac94 100644
--- a/lib/chargebee/models/item_price.rb
+++ b/lib/chargebee/models/item_price.rb
@@ -85,6 +85,7 @@ def self.find_applicable_item_prices(id, params={}, env=nil, headers={})
     Request.send('get', uri_path("item_prices",id.to_s,"applicable_item_prices"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.move_item_price(id, params, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/order.rb b/lib/chargebee/models/order.rb
index def6a52..0602f4d 100644
--- a/lib/chargebee/models/order.rb
+++ b/lib/chargebee/models/order.rb
@@ -128,6 +128,7 @@ def self.list(params={}, env=nil, headers={})
     Request.send_list_request('get', uri_path("orders"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.orders_for_invoice(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/pricing_page_session.rb b/lib/chargebee/models/pricing_page_session.rb
index cc5fee0..29c304f 100644
--- a/lib/chargebee/models/pricing_page_session.rb
+++ b/lib/chargebee/models/pricing_page_session.rb
@@ -8,6 +8,7 @@ class PricingPageSession < Model
 
   def self.create_for_new_subscription(params, env=nil, headers={})
     jsonKeys = { 
+        :custom => 0,
     }
     options = {
         :isIdempotent => true
@@ -17,6 +18,7 @@ def self.create_for_new_subscription(params, env=nil, headers={})
 
   def self.create_for_existing_subscription(params, env=nil, headers={})
     jsonKeys = { 
+        :custom => 0,
     }
     options = {
         :isIdempotent => true
diff --git a/lib/chargebee/models/subscription.rb b/lib/chargebee/models/subscription.rb
index 66ba332..f81985a 100644
--- a/lib/chargebee/models/subscription.rb
+++ b/lib/chargebee/models/subscription.rb
@@ -113,6 +113,7 @@ def self.list(params={}, env=nil, headers={})
     Request.send_list_request('get', uri_path("subscriptions"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.subscriptions_for_customer(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
diff --git a/lib/chargebee/models/transaction.rb b/lib/chargebee/models/transaction.rb
index 8155d4a..26c976d 100644
--- a/lib/chargebee/models/transaction.rb
+++ b/lib/chargebee/models/transaction.rb
@@ -85,6 +85,7 @@ def self.list(params={}, env=nil, headers={})
     Request.send_list_request('get', uri_path("transactions"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.transactions_for_customer(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }
@@ -92,6 +93,7 @@ def self.transactions_for_customer(id, params={}, env=nil, headers={})
     Request.send('get', uri_path("customers",id.to_s,"transactions"), params, env, headers,nil, false, jsonKeys, options)
   end
 
+  # @deprecated This method is deprecated and will be removed in a future version.
   def self.transactions_for_subscription(id, params={}, env=nil, headers={})
     jsonKeys = { 
     }