diff --git a/CHANGELOG.md b/CHANGELOG.md
index a4b4b6e..b10c540 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+### v3.33.0 (2026-09-09)
+* * *
+### Bug Fixes
+* PC-V1 attributes (`plan_id`, `plan_quantity`, `plan_constraint`, `addon_constraint`, `embed`, etc.) are now typed as optional across all affected resources (`Subscription`, `Coupon`, `HostedPage`, `Quote`, `QuotedSubscription`, `Estimate`, `Gift`). PC-V1 and PC-V2 APIs coexist — these fields are absent in PC-V2 responses, so requiring them caused incorrect type errors for PC-V2 users.
+
+
 ### v3.32.0 (2026-09-08)
 * * *
 ### New Features
diff --git a/VERSION b/VERSION
index cac6068..949654d 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.32.0
+3.33.0
diff --git a/package-lock.json b/package-lock.json
index e599cd5..9f34631 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "chargebee",
-  "version": "3.32.0",
+  "version": "3.33.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "chargebee",
-      "version": "3.32.0",
+      "version": "3.33.0",
       "dependencies": {
         "zod": "^4.3.6"
       },
diff --git a/package.json b/package.json
index 3ecbeea..356129c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chargebee",
-  "version": "3.32.0",
+  "version": "3.33.0",
   "description": "A library for integrating with Chargebee.",
   "scripts": {
     "prepack": "npm ci && npm run build",
diff --git a/src/environment.ts b/src/environment.ts
index 7c5a862..ed70aca 100644
--- a/src/environment.ts
+++ b/src/environment.ts
@@ -9,7 +9,7 @@ export const Environment = {
   hostSuffix: '.chargebee.com',
   apiPath: '/api/v2',
   timeout: DEFAULT_TIME_OUT,
-  clientVersion: 'v3.32.0',
+  clientVersion: 'v3.33.0',
   port: DEFAULT_PORT,
   timemachineWaitInMillis: DEFAULT_TIME_MACHINE_WAIT,
   exportWaitInMillis: DEFAULT_EXPORT_WAIT,
diff --git a/src/schema/estimate.schema.ts b/src/schema/estimate.schema.ts
index 8d70c09..e524d25 100644
--- a/src/schema/estimate.schema.ts
+++ b/src/schema/estimate.schema.ts
@@ -8,7 +8,7 @@ import { z } from 'zod';
 
 const CreateSubscriptionEstimateSubscriptionSchema = z.object({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -380,7 +380,7 @@ export type CreateSubItemEstimateEstimateBody = z.infer<
 
 const CreateSubForCustomerEstimateEstimateSubscriptionSchema = z.object({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -1307,7 +1307,7 @@ const GiftSubscriptionEstimateShippingAddressSchema = z.object({
     .optional(),
 });
 const GiftSubscriptionEstimateSubscriptionSchema = z.object({
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
 });
diff --git a/src/schema/gift.schema.ts b/src/schema/gift.schema.ts
index 32c3b03..32760dd 100644
--- a/src/schema/gift.schema.ts
+++ b/src/schema/gift.schema.ts
@@ -102,7 +102,7 @@ const CreateGiftShippingAddressSchema = z.object({
     .optional(),
 });
 const CreateGiftSubscriptionSchema = z.looseObject({
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
 });
diff --git a/src/schema/hosted_page.schema.ts b/src/schema/hosted_page.schema.ts
index 5734b03..6a0052f 100644
--- a/src/schema/hosted_page.schema.ts
+++ b/src/schema/hosted_page.schema.ts
@@ -8,7 +8,7 @@ import { z } from 'zod';
 
 const CheckoutNewHostedPageSubscriptionSchema = z.looseObject({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -1635,7 +1635,7 @@ const CheckoutGiftHostedPageGifterSchema = z.object({
   customer_id: z.string().max(50).optional(),
 });
 const CheckoutGiftHostedPageSubscriptionSchema = z.looseObject({
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   coupon: z.string().max(100).optional(),
diff --git a/src/schema/omnichannel_subscription.schema.ts b/src/schema/omnichannel_subscription.schema.ts
index 3e6438c..e8060e2 100644
--- a/src/schema/omnichannel_subscription.schema.ts
+++ b/src/schema/omnichannel_subscription.schema.ts
@@ -34,16 +34,16 @@ const ListOmnichannelSubscriptionIdAtSourceSchema = z.object({
   not_in: z.string().regex(RegExp('^\\[(.*)(,.*)*\\]$')).optional(),
 });
 const ListOmnichannelSubscriptionUpdatedAtSchema = z.object({
-  after: z.string().regex(RegExp('^\\d{10}$')).optional(),
-  on: z.string().regex(RegExp('^\\d{10}$')).optional(),
   before: z.string().regex(RegExp('^\\d{10}$')).optional(),
   between: z.string().regex(RegExp('^\\[\\d{10},\\d{10}\\]$')).optional(),
-});
-const ListOmnichannelSubscriptionPurchasedAtSchema = z.object({
   after: z.string().regex(RegExp('^\\d{10}$')).optional(),
   on: z.string().regex(RegExp('^\\d{10}$')).optional(),
+});
+const ListOmnichannelSubscriptionPurchasedAtSchema = z.object({
   before: z.string().regex(RegExp('^\\d{10}$')).optional(),
   between: z.string().regex(RegExp('^\\[\\d{10},\\d{10}\\]$')).optional(),
+  after: z.string().regex(RegExp('^\\d{10}$')).optional(),
+  on: z.string().regex(RegExp('^\\d{10}$')).optional(),
 });
 const ListOmnichannelSubscriptionSortBySchema = z.looseObject({
   asc: z.enum(['created_at', 'updated_at']).optional(),
@@ -125,7 +125,9 @@ const OmnichannelTransactionsforomnichannelsubscriptionOmnichannelSubscriptionBo
     limit: z.number().int().min(1).max(100).optional(),
     offset: z.string().max(1000).optional(),
   });
-export { OmnichannelTransactionsforomnichannelsubscriptionOmnichannelSubscriptionBodySchema };
+export {
+  OmnichannelTransactionsforomnichannelsubscriptionOmnichannelSubscriptionBodySchema,
+};
 export type OmnichannelTransactionsforomnichannelsubscriptionOmnichannelSubscriptionBody =
   z.infer<
     typeof OmnichannelTransactionsforomnichannelsubscriptionOmnichannelSubscriptionBodySchema
diff --git a/src/schema/quote.schema.ts b/src/schema/quote.schema.ts
index fee5c30..4030383 100644
--- a/src/schema/quote.schema.ts
+++ b/src/schema/quote.schema.ts
@@ -9,7 +9,7 @@ import { z } from 'zod';
 const CreateSubForCustomerQuoteQuoteSubscriptionSchema = z.object({
   id: z.string().max(50).optional(),
   po_number: z.string().max(100).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -126,7 +126,7 @@ export type CreateSubForCustomerQuoteQuoteBody = z.infer<
 const EditCreateSubForCustomerQuoteQuoteSubscriptionSchema = z.object({
   id: z.string().max(50).optional(),
   po_number: z.string().max(100).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
diff --git a/src/schema/subscription.schema.ts b/src/schema/subscription.schema.ts
index f03e326..cd7d19d 100644
--- a/src/schema/subscription.schema.ts
+++ b/src/schema/subscription.schema.ts
@@ -456,7 +456,7 @@ const CreateSubscriptionCouponsSchema = z.object({
 });
 const CreateSubscriptionBodySchema = z.looseObject({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -672,7 +672,7 @@ const CreateForCustomerSubscriptionCouponsSchema = z.object({
 });
 const CreateForCustomerSubscriptionBodySchema = z.looseObject({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -2946,7 +2946,7 @@ const ImportSubscriptionSubscriptionCouponsSchema = z.object({
 const ImportSubscriptionSubscriptionBodySchema = z.looseObject({
   id: z.string().max(50).optional(),
   client_profile_id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
@@ -3101,7 +3101,7 @@ const ImportForCustomerSubscriptionCouponsSchema = z.object({
 });
 const ImportForCustomerSubscriptionBodySchema = z.looseObject({
   id: z.string().max(50).optional(),
-  plan_id: z.string().max(100),
+  plan_id: z.string().max(100).optional(),
   plan_quantity: z.number().int().min(1).optional(),
   plan_quantity_in_decimal: z.string().max(33).optional(),
   plan_unit_price: z.number().int().min(0).optional(),
diff --git a/src/schema/subscription_entitlement.schema.ts b/src/schema/subscription_entitlement.schema.ts
index e7d53fc..dfb251a 100644
--- a/src/schema/subscription_entitlement.schema.ts
+++ b/src/schema/subscription_entitlement.schema.ts
@@ -14,7 +14,9 @@ const SubscriptionEntitlementsForSubscriptionSubscriptionEntitlementBodySchema =
     embed: z.string().max(1000).optional(),
     include_scheduled_overrides: z.boolean().default(false).optional(),
   });
-export { SubscriptionEntitlementsForSubscriptionSubscriptionEntitlementBodySchema };
+export {
+  SubscriptionEntitlementsForSubscriptionSubscriptionEntitlementBodySchema,
+};
 export type SubscriptionEntitlementsForSubscriptionSubscriptionEntitlementBody =
   z.infer<
     typeof SubscriptionEntitlementsForSubscriptionSubscriptionEntitlementBodySchema
@@ -32,7 +34,9 @@ const SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementBodySchema =
     subscription_entitlements:
       SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementSubscriptionEntitlementsSchema.optional(),
   });
-export { SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementBodySchema };
+export {
+  SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementBodySchema,
+};
 export type SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementBody =
   z.infer<
     typeof SetSubscriptionEntitlementAvailabilitySubscriptionEntitlementBodySchema
diff --git a/types/resources/Coupon.d.ts b/types/resources/Coupon.d.ts
index f70a8c6..0e48921 100644
--- a/types/resources/Coupon.d.ts
+++ b/types/resources/Coupon.d.ts
@@ -24,8 +24,8 @@ declare module 'chargebee' {
       | 'plans_with_quantity'
       | 'not_applicable';
     apply_on: 'invoice_amount' | 'each_specified_item';
-    plan_constraint: 'none' | 'all' | 'specific' | 'not_applicable';
-    addon_constraint: 'none' | 'all' | 'specific' | 'not_applicable';
+    plan_constraint?: 'none' | 'all' | 'specific' | 'not_applicable';
+    addon_constraint?: 'none' | 'all' | 'specific' | 'not_applicable';
     created_at: number;
     archived_at?: number;
     resource_version?: number;
diff --git a/types/resources/Estimate.d.ts b/types/resources/Estimate.d.ts
index cb7caa9..0b0ce34 100644
--- a/types/resources/Estimate.d.ts
+++ b/types/resources/Estimate.d.ts
@@ -506,7 +506,7 @@ declare module 'chargebee' {
     }
     export interface SubscriptionCreateSubscriptionInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -667,7 +667,7 @@ declare module 'chargebee' {
     }
     export interface SubscriptionCreateSubForCustomerEstimateInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -1087,7 +1087,7 @@ declare module 'chargebee' {
       additional_information?: any;
     }
     export interface SubscriptionGiftSubscriptionInputParam {
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
     }
diff --git a/types/resources/Gift.d.ts b/types/resources/Gift.d.ts
index 0ec557e..14dc8ab 100644
--- a/types/resources/Gift.d.ts
+++ b/types/resources/Gift.d.ts
@@ -244,7 +244,7 @@ declare module 'chargebee' {
       additional_information?: any;
     }
     export interface SubscriptionCreateInputParam {
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
     }
diff --git a/types/resources/HostedPage.d.ts b/types/resources/HostedPage.d.ts
index fb18778..5a6f3d2 100644
--- a/types/resources/HostedPage.d.ts
+++ b/types/resources/HostedPage.d.ts
@@ -25,7 +25,7 @@ declare module 'chargebee' {
       | 'acknowledged';
     failure_reason?: 'card_error' | 'server_error';
     pass_thru_content?: string;
-    embed: boolean;
+    embed?: boolean;
     created_at?: number;
     expires_at?: number;
     layout?: LayoutEnum;
@@ -532,7 +532,7 @@ declare module 'chargebee' {
     }
     export interface SubscriptionCheckoutNewInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -1097,7 +1097,7 @@ declare module 'chargebee' {
       customer_id?: string;
     }
     export interface SubscriptionCheckoutGiftInputParam {
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       /**
diff --git a/types/resources/Quote.d.ts b/types/resources/Quote.d.ts
index 67ffe83..e3986f8 100644
--- a/types/resources/Quote.d.ts
+++ b/types/resources/Quote.d.ts
@@ -843,7 +843,7 @@ declare module 'chargebee' {
     export interface SubscriptionCreateSubForCustomerQuoteInputParam {
       id?: string;
       po_number?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -898,7 +898,7 @@ declare module 'chargebee' {
     export interface SubscriptionEditCreateSubForCustomerQuoteInputParam {
       id?: string;
       po_number?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
diff --git a/types/resources/QuotedSubscription.d.ts b/types/resources/QuotedSubscription.d.ts
index fd04adc..8b37ab1 100644
--- a/types/resources/QuotedSubscription.d.ts
+++ b/types/resources/QuotedSubscription.d.ts
@@ -4,8 +4,8 @@
 declare module 'chargebee' {
   export interface QuotedSubscription {
     id: string;
-    plan_id: string;
-    plan_quantity: number;
+    plan_id?: string;
+    plan_quantity?: number;
     plan_unit_price?: number;
     setup_fee?: number;
     billing_period?: number;
diff --git a/types/resources/Subscription.d.ts b/types/resources/Subscription.d.ts
index 51b4ce2..175bb71 100644
--- a/types/resources/Subscription.d.ts
+++ b/types/resources/Subscription.d.ts
@@ -6,8 +6,8 @@ declare module 'chargebee' {
     [key: string]: unknown;
     id: string;
     currency_code: string;
-    plan_id: string;
-    plan_quantity: number;
+    plan_id?: string;
+    plan_quantity?: number;
     plan_unit_price?: number;
     setup_fee?: number;
     billing_period?: number;
@@ -715,7 +715,7 @@ declare module 'chargebee' {
 
     export interface CreateInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -769,7 +769,7 @@ declare module 'chargebee' {
     }
     export interface CreateForCustomerInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -1087,7 +1087,7 @@ declare module 'chargebee' {
     export interface ImportSubscriptionInputParam {
       id?: string;
       client_profile_id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;
@@ -1135,7 +1135,7 @@ declare module 'chargebee' {
     }
     export interface ImportForCustomerInputParam {
       id?: string;
-      plan_id: string;
+      plan_id?: string;
       plan_quantity?: number;
       plan_quantity_in_decimal?: string;
       plan_unit_price?: number;