diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index b05d9a15..ad928211 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v461
\ No newline at end of file
+v481
\ No newline at end of file
diff --git a/lib/stripe/object_types.rb b/lib/stripe/object_types.rb
index 73d4461f..4f925048 100644
--- a/lib/stripe/object_types.rb
+++ b/lib/stripe/object_types.rb
@@ -86,6 +86,8 @@ module Stripe
         PromotionCode::OBJECT_NAME => PromotionCode,
         Quote::OBJECT_NAME => Quote,
         QuotePhase::OBJECT_NAME => QuotePhase,
+        QuotePreviewInvoice::OBJECT_NAME => QuotePreviewInvoice,
+        QuotePreviewSchedule::OBJECT_NAME => QuotePreviewSchedule,
         Radar::EarlyFraudWarning::OBJECT_NAME => Radar::EarlyFraudWarning,
         Radar::ValueList::OBJECT_NAME => Radar::ValueList,
         Radar::ValueListItem::OBJECT_NAME => Radar::ValueListItem,
diff --git a/lib/stripe/resources.rb b/lib/stripe/resources.rb
index 86fe51b8..5eb02a43 100644
--- a/lib/stripe/resources.rb
+++ b/lib/stripe/resources.rb
@@ -73,6 +73,8 @@ require "stripe/resources/product"
 require "stripe/resources/promotion_code"
 require "stripe/resources/quote"
 require "stripe/resources/quote_phase"
+require "stripe/resources/quote_preview_invoice"
+require "stripe/resources/quote_preview_schedule"
 require "stripe/resources/radar/early_fraud_warning"
 require "stripe/resources/radar/value_list"
 require "stripe/resources/radar/value_list_item"
diff --git a/lib/stripe/resources/quote.rb b/lib/stripe/resources/quote.rb
index 72aaf00e..0ce759bf 100644
--- a/lib/stripe/resources/quote.rb
+++ b/lib/stripe/resources/quote.rb
@@ -8,9 +8,17 @@ module Stripe
     extend Stripe::APIOperations::Create
     extend Stripe::APIOperations::List
     include Stripe::APIOperations::Save
+    extend Stripe::APIOperations::NestedResource
 
     OBJECT_NAME = "quote"
 
+    nested_resource_class_methods :todo,
+                                  operations: %i[list],
+                                  resource_plural: "TODO"
+    nested_resource_class_methods :todo,
+                                  operations: %i[list],
+                                  resource_plural: "TODO"
+
     def accept(params = {}, opts = {})
       request_stripe_object(
         method: :post,
@@ -104,24 +112,6 @@ module Stripe
       )
     end
 
-    def preview_invoices(params = {}, opts = {})
-      request_stripe_object(
-        method: :get,
-        path: format("/v1/quotes/%<quote>s/preview_invoices", { quote: CGI.escape(self["id"]) }),
-        params: params,
-        opts: opts
-      )
-    end
-
-    def preview_subscription_schedules(params = {}, opts = {})
-      request_stripe_object(
-        method: :get,
-        path: format("/v1/quotes/%<quote>s/preview_subscription_schedules", { quote: CGI.escape(self["id"]) }),
-        params: params,
-        opts: opts
-      )
-    end
-
     def reestimate(params = {}, opts = {})
       request_stripe_object(
         method: :post,
@@ -229,24 +219,6 @@ module Stripe
       )
     end
 
-    def self.preview_invoices(quote, params = {}, opts = {})
-      request_stripe_object(
-        method: :get,
-        path: format("/v1/quotes/%<quote>s/preview_invoices", { quote: CGI.escape(quote) }),
-        params: params,
-        opts: opts
-      )
-    end
-
-    def self.preview_subscription_schedules(quote, params = {}, opts = {})
-      request_stripe_object(
-        method: :get,
-        path: format("/v1/quotes/%<quote>s/preview_subscription_schedules", { quote: CGI.escape(quote) }),
-        params: params,
-        opts: opts
-      )
-    end
-
     def self.reestimate(quote, params = {}, opts = {})
       request_stripe_object(
         method: :post,
diff --git a/lib/stripe/resources/quote_preview_invoice.rb b/lib/stripe/resources/quote_preview_invoice.rb
new file mode 100644
index 00000000..abf093a1
--- /dev/null
+++ b/lib/stripe/resources/quote_preview_invoice.rb
@@ -0,0 +1,42 @@
+# File generated from our OpenAPI spec
+# frozen_string_literal: true
+
+module Stripe
+  # Invoices are statements of amounts owed by a customer, and are either
+  # generated one-off, or generated periodically from a subscription.
+  #
+  # They contain [invoice items](https://stripe.com/docs/api#invoiceitems), and proration adjustments
+  # that may be caused by subscription upgrades/downgrades (if necessary).
+  #
+  # If your invoice is configured to be billed through automatic charges,
+  # Stripe automatically finalizes your invoice and attempts payment. Note
+  # that finalizing the invoice,
+  # [when automatic](https://stripe.com/docs/invoicing/integration/automatic-advancement-collection), does
+  # not happen immediately as the invoice is created. Stripe waits
+  # until one hour after the last webhook was successfully sent (or the last
+  # webhook timed out after failing). If you (and the platforms you may have
+  # connected to) have no webhooks configured, Stripe waits one hour after
+  # creation to finalize the invoice.
+  #
+  # If your invoice is configured to be billed by sending an email, then based on your
+  # [email settings](https://dashboard.stripe.com/account/billing/automatic),
+  # Stripe will email the invoice to your customer and await payment. These
+  # emails can contain a link to a hosted page to pay the invoice.
+  #
+  # Stripe applies any customer credit on the account before determining the
+  # amount due for the invoice (i.e., the amount that will be actually
+  # charged). If the amount due for the invoice is less than Stripe's [minimum allowed charge
+  # per currency](https://stripe.com/docs/currencies#minimum-and-maximum-charge-amounts), the
+  # invoice is automatically marked paid, and we add the amount due to the
+  # customer's credit balance which is applied to the next invoice.
+  #
+  # More details on the customer's credit balance are
+  # [here](https://stripe.com/docs/billing/customer/balance).
+  #
+  # Related guide: [Send invoices to customers](https://stripe.com/docs/billing/invoices/sending)
+  class QuotePreviewInvoice < APIResource
+    extend Stripe::APIOperations::List
+
+    OBJECT_NAME = "quote_preview_invoice"
+  end
+end
diff --git a/lib/stripe/resources/quote_preview_schedule.rb b/lib/stripe/resources/quote_preview_schedule.rb
new file mode 100644
index 00000000..05c5cc70
--- /dev/null
+++ b/lib/stripe/resources/quote_preview_schedule.rb
@@ -0,0 +1,10 @@
+# File generated from our OpenAPI spec
+# frozen_string_literal: true
+
+module Stripe
+  class QuotePreviewSchedule < APIResource
+    extend Stripe::APIOperations::List
+
+    OBJECT_NAME = "quote_preview_schedule"
+  end
+end
diff --git a/lib/stripe/webhook.rb b/lib/stripe/webhook.rb
index df1ed65d..63b2f0c8 100644
--- a/lib/stripe/webhook.rb
+++ b/lib/stripe/webhook.rb
@@ -108,8 +108,9 @@ module Stripe
         end
 
         if tolerance && timestamp < Time.now - tolerance
+          formatted_timestamp = Time.at(timestamp).strftime("%F %T")
           raise SignatureVerificationError.new(
-            "Timestamp outside the tolerance zone (#{Time.at(timestamp)})",
+            "Timestamp outside the tolerance zone (#{formatted_timestamp})",
             header, http_body: payload
           )
         end